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Thèses sur le sujet « Citrus Diseases and pests »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 29 janvier 2023

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1

Wright, Glenn C., and John Begeman. "Diagnosing Home Citrus Problems." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2009. http://hdl.handle.net/10150/144796.

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6 pp.<br>Low Desert Citrus Varieties; Irrigating Citrus Trees<br>Diagnosing Home Citrus Problems includes information on all the commonly encountered dooryard citrus problems encountered in Arizona. Problems/disorders are grouped into three catagories: problems with fruit, problems with leaves, and problems with stems, branches and entire tree. Symptoms, causes and control measures are given for each disorder.

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Phiri, Zanele Penelope. "Creasing studies in citrus." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4219.

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Thesis (MScAgric (Horticulture))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Creasing, also known as albedo breakdown, is a preharvest disorder that affects the albedo of citrus fruit causing creases on the surface of the fruit. It is a recurrent problem in Navel and Valencia oranges and can cause individual orchard losses which often exceed 50%. Although the contributing factors are known, the physiological basis of creasing development is unresolved and the current control measures do not prevent creasing satisfactory. Hence, better control measures and further understanding

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3

Van, der Walt Rachel. "Identifying volatile emissions associated with False Codling Moth infested citrus fruit." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1020056.

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False codling moth is a known pest of economic importance to many cultivated crops in South Africa and Africa south of the Sahara, and is particularly severe on citrus. If the fruit is infested just before harvest the chances of detecting signs of infestation are very low. As a result, the risk of packaging infested fruit and exporting them as healthy fruit is high. It is therefore a priority to develop a post-harvest technique for detection of False codling moth in citrus fruit at different levels of infestation in order to reduce phytosanitary risk. Compounds released and detected were indic

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4

Knight, Toby George. "Investigation of the physiological basis of the rind disorder oleocellosis in Washington navel orange (Citrus sinensis [L.] Osbeck)." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09AHP/09ahpk71.pdf.

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Includes bibliographical references (leaves 152-164) Microscopy investigations into the oil glands, localisation of the rind oils and the development of oleocellosis have been carried out in Washington navel orange (Citrus sinensis [L.] Osbeck). Aims to develop an improved understanding of the physiological basis of the rind disorder.

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Wakgari, Waktola (Waktola Muleta). "Biology, ecology and management of white wax scale, Ceroplastes destructor Newstead (Hemiptera: Coccidae), on citrus and syzygium." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51637.

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Thesis (PhD)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: The population density of the white wax scale, Ceroplastes destructor Newstead, has increased since 1994 in certain areas of Western and parts of Eastern Cape Provinces of South Africa where citrus is grown, particularly on Citrus reticulata (Blanco). A study was conducted to investigate its morphology, biology and ecology as contributions to the development of a sound integrated management programme. Characteristics of the immature stages and adult females were described and illustrated from field-collected and slide-

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6

Ceballo, Flor Angel Aquino. "An investigation into why coccidoxenoides peregrinus (timberlake) (hymenoptera:encyrtidae) is an effective biological control agent in Queensland citrus /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16498.pdf.

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7

FitzGerald, Véronique Chartier. "Screening of entomopathogenic fungi against citrus mealybug (Planococcus citri (Risso)) and citrus thrips (Scirtothrips aurantii (Faure))." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1020887.

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Mealybugs (Planococcus citri) and thrips (Scirtothrips aurantii) are common and extremely damaging citrus crop pests which have proven difficult to control via conventional methods, such as chemical pesticides and insect growth regulators. The objective of this study was to determine the efficacy of entomopathogenic fungi against these pests in laboratory bioassays. Isolates of Metarhizium anisopliae and Beauveria bassiana from citrus orchards in the Eastern Cape, South Africa were maintained on Sabouraud Dextrose 4% Agar supplemented with Dodine, chloramphenicol and rifampicin at 25°C. Infect

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8

Wright, Jacqueline Gilda. "The role of endophytes in citrus stem end rots." Thesis, Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19736654.

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Mathewson, Johanna. "Die insekplaagkompleks op sitrus te Vaalharts." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51706.

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Thesis (MSc)--Stellenbosch University, 2000.<br>Full text to be digitised and attached to bibliographic record.<br>ENGLISH ABSTRACT: The cultivation of citrus in the Vaalharts region is a fairly recent development. With the introduction of this crop, an insect pest complex has also developed in this region. The presence of these pests was studied in eleven orchards, planted with three citrus cultivars and of varying ages, distributed in the 300 square kilometer cultivation area. Each orchard was inspected for the presence of pests by making use of two weekly sampling techniques. Ten of

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10

Opoku-Debrah, John Kwadwo. "Geographic variation in the susceptibility of false colding Moth, Thaumatotibia Leucotreta, populations to a granulovirus (CrleGV-SA)." Thesis, Nelson Mandela Metropolitan University, 2008. http://hdl.handle.net/10948/984.

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The false codling moth (FCM), Thaumatotibia (=Cryptophlebia) leucotreta (Meyrick) (Lepidoptera: Tortricidae) is a serious pest of citrus and other crops in Sub-Saharan Africa. The introduction of the Cryptophlebia leucotreta granulovirus (CrleGV-SA) Cryptogran and Cryptex (biopesticides) has proven to be very effective in the control of FCM. However, markedly lower susceptibility of some codling moth (CM), Cydia pomonella (L.) populations to Cydia pomonella granulovirus (CpGV-M), another granulovirus product used in the control of CM’s in Europe have been reported. Genetic differences between

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Kirkman, Wayne. "Understanding and improving the residual efficacy of the cryptophlebia leucotreta granulovirus (Cryptogran)." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005482.

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False codling moth (FCM), Thaumatotibia (=Cryptophlebia) leucotreta (Meyr) (Lepidoptera: Tortricidae), is one of the most important pests on citrus. The Cryptophlebia leucotreta granulovirus (CrleGV) has been developed into a successful biological control agent, registered under the name Cryptogran, and is currently the preferred product for the control of FCM on citrus in South Africa. A prerequisite to the continued success of Cryptogran as a means of controlling false codling moth is to understand the factors affecting field persistence of the virus, and to find ways to improve it. The aim

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12

Moore, Sean Douglas. "The development and evaluation of Cryptophlebia Leucotreta granulovirus (CrleGV) as a biological control agent for the management of false codling moth, Cryptophlebia Leucotreta, on citrus." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1004001.

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A granulovirus isolated from Cryptophlebia leucotreta larvae was shown through restriction endonuclease analysis to be a novel strain (CrleGV-SA). No more than one isolate could be identified from a laboratory culture of C. leucotreta. However, a preliminary examination of restricted DNA profiles of isolates from different geographical regions indicated some minor differences. In surface dose bioassays on artificial diet, LC50 and LC90 values with neonate larvae were estimated to be 4.095 x 103 OBs/ml and 1.185 x 105 OBs/ml respectively. LT50 and LT90 values with neonate larvae were estimated

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13

Gilbert, Martin Jeffray. "The ecology of the South African citrus thrips, Scirtothrips aurantii Faure and its economic implications." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005358.

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The South African Citrus Thrips, Scirtothrips aurantii Faure (Thysanoptera: Thripidae) has been a serious pest of the citrus industry of Southern Africa for over 70 years. It is indigenous to Africa and has no recorded parasitoids and, in most citrus-growing regions, predators are not economically effective. Firstly, in this study, the general ecology of thrips was reviewed along with the recorded history of S. aurantii and its control. Host plant relationships of S. aurantii were then examined and wild hosts were not found to be important in promoting citrus thrips outbreaks in the orchard af

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Mphahlele, Mogalatjane Patrick. "Honey bee dissemination of Bacillus subtilis to citrus flowers for control of Alternaria." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/24207.

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The initial phase in the development of a biological control strategy is screening of biological control agents. Secondary to this phase is the establishment of accurate, effective application techniques. However, successful control requires a thorough understanding of all factors affecting the relationship between host plant, pathogen and other microbes. The purpose of this study was to screen and identify potential bacterial antagonists against Alternaria, a fungal citrus pathogen, attachment of the antagonists to bees, and bee dissemination of the antagonist to citrus flowers. A total of 56

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Sishuba, Nomahlubi. "Investigation of the larval parasitoids of the false codling moth, Cryptophlebia Leucotreta (Meyrick) (Lepidoptera: Tortricidae), on citrus in South Africa." Thesis, Rhodes University, 2004. http://hdl.handle.net/10962/d1016267.

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The study examined the larval parasitoids of Cryptophlebia leucotreta (Meyrick) on citrus in South Africa and aimed to improve the existing rearing techniques of C. leucotreta with a view to mass rearing of biological control agents. The biological characteristics of Agathis bishopi Nixon (Hymenoptera: Braconidae) were studied, with an emphasis on parasitism rates in the field, host stage preference, developmental rate, life span and offspring sex ratios. Two larval parasitoids, A. bishopi and Apophua leucotretae (Wilkinson) (Hymenoptera: Ichneumonidae), and an egg parasitoid, Trichogrammatoid

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Love, Claire Natalie. "The biology, behaviour and survival of pupating false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), a citrus pest in South Africa." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018907.

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Control of the citrus pest, false codling moth (FCM), Thaumatotibia leucotreta Meyrick (Lepidoptera: Tortricidae) is crucial for the South African citrus industry. The economic losses and phytosanitary status of this pest, coupled with increased consumer awareness and demands, has created a need for effective, IPM-compatible control measures for use against the soil-dwelling life stages of FCM. Promising developments in the field of microbial control through the use of entomopathogenic fungi (EPF) and entomopathogenic nematodes (EPNs) have highlighted the need for research regarding pupation b

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Van, Niekerk Sonnica. "The use of entomopathogenic nematodes to control citus mealybug, Planococcus citri (Hemiptera: Pseudococcidae) on citrus in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20147.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Planococcus citri (Risso) (Hemiptera: Pseudococcidae), the citrus mealybug, is a highly destructive pest of citrus in South Africa. The ability of mealybugs to develop resistance to chemicals, as well as their cryptic nature and protective wax coverings, all individually and combined, impair the ability of insecticides to control them. Furthermore, chemicals deplete natural enemy populations that usually establish control over mealybug populations well before harvest in March to May. The inability of chemicals to control P.

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18

Wagenaar, Gideon Daniel. "Dispersal of sterile false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), for a sterile insect technique programme on citrus." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/4977.

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The false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), is an important pest of citrus in South Africa and challenging to manage due to its inconspicuous nature. An effective method currently being employed for the area-wide suppression of the FCM is the Sterile Insect Technique (SIT) and the effective dispersal of sterile moths is very important for success with SIT. This study was conducted in the Addo area of the Sundays River Valley (Eastern Cape) where the programme is commercially used. In this study, sterile male moths were released in different orch

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19

Gendall, Kierryn Leigh. "Agathis bishopi (Nixon) (Hymenoptera: braconidae) its biology and usefulness as a biological control agent for false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: tortricidae), on citrus bishopi (Nixon) (Hymenoptera: braconidae) its biology and usefulness as a biological control agent for false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: tortricidae), on citrus." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005317.

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The false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), is one of the major pests of citrus in South Africa, the others being mealybug, Mediterranean fruit fly, bollworm and some mites. Due to problems such as the expense of pesticides, insects evolving pesticide resistance (Hogsette 1999), chemical residue on the skin of export fruit and the negative impact of pesticides on the environment, it became necessary to find alternative methods for pest control (Viggiani 2000). Agathis bishopi (Nixon) (Hymenoptera: Braconidae), a larval parasitoid of false codling moth

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Pretorius, Mathys Cornelius. "Epidemiology and control of Pseudocercospora angolensis fruit and leaf spot disease on citrus in Zimbabwe." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/20938.

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Thesis (MScAgric)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Fruit and Leaf Spot Disease (FLSD) of citrus, caused by Phaeoramularia angolensis, is found only in 18 countries in Africa, the Comores Islands in the Indian Ocean and Yemen in the Arabian peninsula. The major citrus export countries in Africa are Morocco, South Africa, Swaziland, and Zimbabwe. Zimbabwe is the only country affected by FLSD. FLSD is a disease of major phytosanitary and economic importance and its devastating effect on citrus is highlighted by the fact that the damage is cosmetic, which renders the fr

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21

Lee, Suk-wah, and 李淑華. "Fungicide resistance and genetic diversity of Penicillium digitatum inHong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31226255.

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Neethling, Jacob van der Westhuizen. "Biologiese beheer van plantparasitiese nematodes met die swam Paecilomyces lilacinus by aartappels, sitrus en wingerd." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53311.

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Thesis (MSc)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: Paecilomyces Ii/acinus, ras 251 (geregistreer in terme van wet 36 van 1947 as Suid-Afrika se eerste natuurlike nematisiede en kommersieel beskikbaar as PI Plus) is as biologiese beheer agent getoets by aartappels en in geïntegreerde beheer programme by sitrus en wingerd teen respektiewelik Me/oidogyne species, Ty/enchu/us semipenetrans en verskeie ektoparasitiese nematodes. Die swam toon belofte vir die beheer van hierdie nematodes en het terselfdertyd nie 'n nadelige effek op nie-teiken, voordelige organismes in die grond

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Sumares, Julia Albani Prado [UNESP]. "Influência da temperatura sobre fisiologia e crescimento de Xanthomonas citri subsp. citri." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/91614.

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Made available in DSpace on 2014-06-11T19:25:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-06-22Bitstream added on 2014-06-13T18:53:21Z : No. of bitstreams: 1 sumares_jap_me_arafcf.pdf: 902012 bytes, checksum: 885db9e62dd6f2315568900f3dbc8407 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Universidade Estadual Paulista (UNESP)<br>O cancro cítrico asiático, causado pela bactéria Xanthomonas citri subsp. citri (Xac), é uma das doenças mais importantes dos Citrus e de ocorrência mundial. Esta doença constitui um grande risco para a citricultura brasi

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Nepgen, Eugene Stephan. "A study on the application technology of the sterile insect technique, with focus on false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), a pest of citrus in South Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013199.

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False codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) is considered the most important indigenous pest of citrus in southern Africa. Major concerns such as progressive insecticidal resistance, the negative impact of insecticides on the environment, as well as the influence of consumers opposed to chemical residues on fruit, created opportunities for biological control methods such as Sterile Insect Technology (SIT). This technology is now established in the Western and Eastern Cape provinces of South Africa as an effective, sustainable alternative to conventio

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Sitole, Phumeza. "Investigating the role of mycorrhizal fungi and associated bacteria in promoting growth of citrus seedlings." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013033.

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South Africa is the world's second largest exporter of fresh citrus and is ranked 14th in citrus production. Fungal pathogens such as Phytophthora and Pythium cause economic losses as a result of root rot and brown rot. Mycorrhizal fungi are specialized members of the fungal community forming a mutualistic relationship with plant roots. Mycorrhizal fungal structures are known to associate with other soil microorganisms and these may contribute to improved plant growth. A diverse group of bacteria that interact with the mycorrhizal fungi are known as Mycorrhizal Helper Bacteria (MHB). The aim o

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Santos, Mário dos [UNESP]. "Reação de 16 porta-enxertos sob laranjeira 'Valência' ao agente causal, Candidatus Liberibacter asiaticus." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/92648.

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Made available in DSpace on 2014-06-11T19:26:08Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-22Bitstream added on 2014-06-13T18:29:32Z : No. of bitstreams: 1 santos_m_me_jabo.pdf: 333325 bytes, checksum: 9f90954b7831d0ab7d554fea50c99a27 (MD5)<br>O huanglongbing (HLB ou greening) é uma doença altamente destrutiva que ataca a maioria das espécies de citros. Trabalhos e observações recentes sugerem que os porta-enxertos podem ter influência na incidência e severidade da doença. O presente projeto teve como objetivo monitorar a reação de 16 variedades de porta-enxertos sob laranjeir

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Santos, Mário dos. "Reação de 16 porta-enxertos sob laranjeira 'Valência' ao agente causal, Candidatus Liberibacter asiaticus /." Jaboticabal, 2013. http://hdl.handle.net/11449/92648.

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Orientador: Eduardo Sanches Stuchi<br>Coorientador: Helvécio Della Coletta Filho<br>Banca: Antonio Baldo Geraldo Martins<br>Banca: Simone Rodrigues da Silva<br>Resumo: O huanglongbing (HLB ou greening) é uma doença altamente destrutiva que ataca a maioria das espécies de citros. Trabalhos e observações recentes sugerem que os porta-enxertos podem ter influência na incidência e severidade da doença. O presente projeto teve como objetivo monitorar a reação de 16 variedades de porta-enxertos sob laranjeira „Valencia‟ frente ao Candidatus Liberibacter asiaticus por meio da técnica de q-PCR, e suas

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Dall'Acqua, Flávia Cristina [UNESP]. "Análise por sequências multilocus de Xanthomonas fuscans subsp. aurantifolii." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/92675.

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Made available in DSpace on 2014-06-11T19:26:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-12-15Bitstream added on 2014-06-13T19:33:26Z : No. of bitstreams: 1 dallacqua_fc_me_jabo.pdf: 321125 bytes, checksum: 095ba41139dc507b26139c5c4897dd6c (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>As bactérias pertencentes ao gênero Xanthomonas constituem um dos grupos de fitopatógenos mais importantes na natureza, com capacidade de infectar aproximadamente 120 tipos diferentes de plantas monocotiledôneas e 270 dicotiledôneas. A bactéria Xanthomonas citri s

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Johnson, Todd. "Biology of the oleander mealybug, Paracoccus burnerae (Brain) (Hemiptera: Pseudococcidae)." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5323.

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Thesis (MSc (Botany and Zoology))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT:Chapter 1 - Mealybugs are tiny, soft-bodied insects which constitute the second largest scale insect family Pseudococcidae (Downie & Gullan 2004). The family comprises approximately 2000 species in 300 genera (Ben-Dov 1994), of which 20 species are pests of cultivated plants in South Africa (Annecke & Moran 1982). In South Africa, approximately 109 species of mealybugs have been recorded from 50 genera (Millar 2002). Chapter 2 - The effect of constant temperatures on the development, survival and fecundi

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Yan, Jwo-Yee. "Studies on the behaviour of males of California red scale Aonidiella aurantii (Maskell)." Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09A/09ay21.pdf.

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Sumares, Julia Albani Prado. "Influência da temperatura sobre fisiologia e crescimento de Xanthomonas citri subsp. citri /." Araraquara : [s.n.], 2012. http://hdl.handle.net/11449/91614.

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Orientador: Henrique Ferreira<br>Coorientador: José Belasque Júnior<br>Banca: Franklin Behlau<br>Banca: Luís Octávio Regasini<br>Resumo: O cancro cítrico asiático, causado pela bactéria Xanthomonas citri subsp. citri (Xac), é uma das doenças mais importantes dos Citrus e de ocorrência mundial. Esta doença constitui um grande risco para a citricultura brasileira uma vez que os sintomas podem diminuir o valor de mercado das frutas, e, por vezes, até impedir a sua comercialização. Neste trabalho determinamos a influência da temperatura no crescimento e fisiologia de Xac, com especial atenção à te

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Bownes, Angela. "The structure of ant communities and their impact on soil-pupating pests in citrus orchards in the Grahamstown area of the Eastern Cape." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1005463.

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Two ant species, Pheidole megacephala (Fabricius) and Anoplolepis custodiens (Smith) reach pest status in citrus orchards through precipitating outbreaks of homopterous pests. However, predacious ants, including these two ant species, play an important role in pest suppression in agroecosystems and are therefore beneficial to these systems. If A. custodiens and P. megacephala are important natural control agents in citrus, using ant bands to break the mutualism between the ants and the Homoptera as a method of ant control is preferable to poisoning. Ant communities were sampled by pitfall trap

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Zimba, Kennedy Josaya. "Using the larval parasitoid, Agathis bishopi (Nixon) (Hymenoptera: Braconidae), for early detection of false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) infested fruit." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017186.

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Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) is one of the major citrus pests of economic importance for South Africa’s citrus industry. It is endemic to Africa, and therefore a phytosanitary pest with zero tolerance by most export markets. The cryptic nature of T. leucotreta makes visual inspection an inefficient method for detecting neonate larvae in fruit in the packhouse. Therefore, a more accurate method for sorting infested fruit at the packhouse, particularly for newly infested fruit could ensure market access. A recent study showed that fruit infested by T. leucotreta

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Goble, Tarryn Anne. "Investigation of entomopathogenic fungi for control of false codling moth, Thaumatotibia leucotrata, Mediterranean fruit fly, Ceratitis capitata and Natal fruit fly, C. rosa in South African citrus." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1005409.

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The biology of key citrus pests Thaumatotibia leucotreta Meyrick (Lepidoptera: Tortricidae), Ceratitis capitata Wiedemann (Diptera: Tephritidae) and Ceratitis rosa Karsch (Diptera: Tephritidae) includes their dropping from host plants to pupate in the soil below citrus trees. Since most EP fungi are soil-borne microorganisms, the development and formulation of alternative control strategies using these fungi as subterranean control agents, targeted at larvae and pupae in the soil, can potentially benefit existing IPM management of citrus in South Africa. Thus, a survey of occurrence of entomop

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Dall'Acqua, Flávia Cristina. "Análise por sequências multilocus de Xanthomonas fuscans subsp. aurantifolii/." Jaboticabal : [s.n.], 2011. http://hdl.handle.net/11449/92675.

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Orientador: Jesus Aparecido Ferro<br>Coorientador: José Belasque Júnior<br>Banca: Lúcia Maria Carareto Alves<br>Banca: Franklin Behlau<br>Resumo: As bactérias pertencentes ao gênero Xanthomonas constituem um dos grupos de fitopatógenos mais importantes na natureza, com capacidade de infectar aproximadamente 120 tipos diferentes de plantas monocotiledôneas e 270 dicotiledôneas. A bactéria Xanthomonas citri subsp. citri (Xcc) é o agente causal do cancro cítrico, uma das principais doenças dos citros. Restrita à Flórida, a mancha bacteriana dos citros, causada por Xanthomonas alfalfae subsp. citr

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Porto, Bianca Luzardo. "Avaliação do potencial de controle biológico da mancha marrom de alternaria com Trichoderma spp., Bacillus subtilis e fertilizante organomineral." reponame:Repositório Institucional da UCS, 2016. https://repositorio.ucs.br/handle/11338/2690.

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O Brasil é o maior produtor de citros, sendo um dos seus principais produtos de exportação da cadeia agroindustrial. Um dos fatores que afetam a qualidade e a produção do produto final obtido é a Mancha Marrom de Alternaria, causado pelo fungo Alternaria alternata. A doença provoca desfolha, seca de ramos e queda de frutos em tangerinas e seus híbridos. Para controle dessa doença são utilizados fungicidas, porém, a mancha marrom é uma doença de difícil controle podendo ser necessárias de 7 a 10 aplicações do fungicida, aparecimento de resistência dos fungos, intoxicação nas pessoas e contamina

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Alfaro, Lemus Ana Lilia. "Factors influencing the control of citrophilous mealybug Pseudococcus calceolarie (Maskell) by Coccophagus gurneyi Compere in the Riverland of South Australia." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09IM/09iml562.pdf.

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Includes bibliographical references (leaves 102-114) The highly successful biological control of the citrophilous mealybug Pseudococcus calceolarie (Maskell) (CM) by the parasitic wasp Coccophagus gurneyi Compere in several countries led to the release of this parasitoid in the Riverland of South Australia as part of an integrated pest management program. However CM has not been successfully controlled in this region. The results of this study may help to explain the lack of effective biological control of CM in Riverland citrus.

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Coombes, Candice Anne. "Entomopathogenic fungi for control of soil-borne life stages of false codling moth, Thaumatotibia leucotreta (Meyrick) (1912) (Lepidoptera: Tortricidae)." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1002057.

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False codling moth (FCM), Thaumatotibia leucotreta is an extremely important pest of citrus in South Africa and with the shift away from the use of chemicals, alternate control options are needed. One avenue of control which has only recently been investigated against the soil-borne life stages of FCM is the use of entomopathogenic fungi (EPF). In 2009, 12 entomopathogenic fungal isolates collected from South African citrus orchards showed good control potential during laboratory conducted bioassays. The aim of this study was to further analyse the potential of these isolates through concentra

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Figueiredo, Margarida Garcia de. "Retorno econômico dos investimentos em pesquisa e desenvolvimento (P & D) na citricultura paulista." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11132/tde-11072008-162138/.

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Os modelos de crescimento econômico mostram que a única forma de promover o crescimento sustentado da economia é por meio do progresso tecnológico. Porém, a manutenção de um fluxo crescente de inovações tecnológicas requer uma forte estrutura de pesquisa e desenvolvimento (P&D), o que implica em uma série de gastos por parte de ambos os setores, público e privado. Conseqüentemente, as instituições de pesquisa são crescentemente cobradas quanto aos resultados dos recursos nelas investidos, o que torna interessante a realização de estudos que procurem avaliar os retornos de tais investimentos e

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Gabia, Adriana Aparecida [UNESP]. "Flutuação populacional de Tylenchulus semipenetrans em citros, sua correlação com a produção e determinação das variáveis para avaliação populacional." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/97265.

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Made available in DSpace on 2014-06-11T19:28:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-26Bitstream added on 2014-06-13T19:37:24Z : No. of bitstreams: 1 gabia_aa_me_botfca.pdf: 416606 bytes, checksum: 894930ec055a3224888bc51077855bce (MD5)<br>Tylenchulus semipenetrans é o principal nematoide em citros, causando perdas que variam de 10 a 30%. Está amplamente disseminado nos pomares citrícolas do Brasil. Para determinar o nível populacional desse nematoide, que varia durante o ano, diferentes variáveis são utilizadas. Sendo assim o objetivo deste trabalho foi avaliar a flutua

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Gabia, Adriana Aparecida 1984. "Flutuação populacional de Tylenchulus semipenetrans em citros, sua correlação com a produção e determinação das variáveis para avaliação populacional /." Botucatu, 2013. http://hdl.handle.net/11449/97265.

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Orientador: Silvia Renata Siciliano Wilcken<br>Banca: Sarita Leonel<br>Banca: Claudio Marcelo Gonçalves de Oliveira<br>Resumo: Tylenchulus semipenetrans é o principal nematoide em citros, causando perdas que variam de 10 a 30%. Está amplamente disseminado nos pomares citrícolas do Brasil. Para determinar o nível populacional desse nematoide, que varia durante o ano, diferentes variáveis são utilizadas. Sendo assim o objetivo deste trabalho foi avaliar a flutuação populacional do nematoide T. semipenetrans em pomar de laranja 'Pera Rio' enxertada em limoeiro 'Cravo', correlacionar a população d

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Taverner, Peter D. "Effects of postharvest oils on arthropod pests of citrus /." Title page, contents and summary only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09pht233.pdf.

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Olsen, Mary W. "Diseases of Citrus in Arizona." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/146963.

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15 pp.<br>Originally published: 2000<br>This publication discusses some diseases that are sufficiently important to the citrus in Arizona. Topics include: -Parasitic Diseases -fungi / virus diseases / virus or virus-like diseases -Mycoplasma Diseases -Nematode Diseases -Nonparasitic Diseases

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Olsen, Mary, Mike Matheron, Mike McClure, and Zhongguo Xiong. "Diseases of Citrus in Arizona." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011. http://hdl.handle.net/10150/239607.

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Auret, Erika Elizabeth. "Control strategies for citrus postharvest diseases." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-06192006-084845.

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Terry, Alan J. "Control of pests and diseases." Thesis, University of Surrey, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505965.

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Xiao, Yingfang Fadamiro Henry Y. "Biology, ecology, and management of key pests of satsuma citrus in Alabama." Auburn, Ala., 2009. http://hdl.handle.net/10415/1912.

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George, Adrienne. "Cataloguing Diseases and Pests in Captive Corals." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3115.

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Stony corals (Order Scleractinia) are susceptible to a variety of diseases, which can occur from abiotic or biotic factors, or a combination of both. Public aquaria provide opportunities to study coral disease. Because coral mucus is the first line of defense against disease, the Biolog EcoplateTM is a useful tool to detect differences in microbial assemblages in the surface mucopolysaccharide (mucus) layer when comparing healthy and diseased corals. Histological examination is essential to document structural changes in coral tissue in response to diseases. This study identifies and character

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Matheron, Michael, Michael Maurer, and Martin Porchas. "Improving Management and Control of Fungal Diseases Affecting Arizona Citrus." College of Agriculture, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/220561.

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Experiments were initiated to evaluate chemical disease management tools for Alternaria fruit rot on navel orange and Coniophora brown wood rot on lemon trees, examine the possible effect of branch diameter on development of Coniophora wood rot on lemon trees and continue evaluations of relative resistance of rootstocks to root rot and stem canker development when inoculated with P. citrophthora and P. parasitica. Rovral or Kocide did not significantly reduce the amount of Alternaria fruit rot on navel orange trees occurring in late summer and early autumn when applied during the preceding win

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Denman, Sandra. "Botryosphaeria diseases of proteaceae." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52721.

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Dissertation (PhD (Agric))--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: Fungi belonging to the genus Botryosphaeria are heterotrophic micromycetes that can be pathogens on woody plants. They cause serious, and in some cases devastating losses to crops through leaf necrosis, stem cankers and plant death. The Proteaceae cut-flower industry in South Africa accounts for 70% of the national cut-flower enterprise. Botryosphaeria diseases are a major impediment to production and trade of Proteaceae and there is an urgent need to investigate the etiology, epidemiology and control of t

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