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Dissertations / Theses on the topic 'Citrus mealybugs'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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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2

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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3

Parkinson, Jasmine Frances. "The dynamics of biological Russian dolls : investigating the causes and consequences of variation in symbiont density in citrus mealybugs." Thesis, University of Sussex, 2016. http://sro.sussex.ac.uk/id/eprint/60565/.

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Endosymbiosis has been a major driver of evolutionary diversification of eukaryotes. However, symbiosis can create conflict between partners and symbiont density is often tightly regulated within hosts to ensure optimal functioning of the holobiont. The horticultural pest insects, citrus mealybugs, make an intriguing and potentially-powerful case study for endosymbiosis, harbouring two obligate, nutritional, vertically transmitted bacteria: Tremblaya princeps and Moranella endobia, in a nested mutualism. In this thesis, I examine the variation in the density of each of these obligate symbionts

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4

Willmott, Amy Lynn. "Efficacy of systemic insecticides against the citrus mealybug, Planococcus citri, and pesticide mixtures against the western flower thrips, Frankliniella occidentalis, in protected environments." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13683.

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Master of Science<br>Department of Entomology<br>Kun Yan Zhu<br>Raymond A. Cloyd<br>Protected environments, such as greenhouses and interior plantscapes provide optimal conditions for arthropod (insect and/or mite) pests to survive, develop, and reproduce. Two commonly encountered insect pests in protected environments include the citrus mealybug (CMB), Planococcus citri, and the western flower thrips (WFT), Frankliniella occidentalis. It is difficult to mitigate CMB and WFT populations due to the behavioral characteristics of the insects and few pesticides that are registered for use in prote

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5

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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6

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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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

Kerns, David L. "Integrated Pest Management of Citrus Mealybug." College of Agriculture, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/198110.

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Foliar-applied insecticides and the soil-applied insecticide, Admire, were evaluated for their ability to control citrus mealybug on lemons while having a minimal impact on parasitoids. All of the foliar-applied insecticide exhibited activity towards citrus mealybug. The standard insecticide, Lorsban, performed very well, but since this product is especially harmful to parasitoids it is not considered to have a good fit in IPM programs where parasitoid conservation is emphasized. The currently labeled alternative, Applaud, was an effective treatment and should be considered for citrus m

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9

Jackson, Alison. "The reproductive biology and behaviour of #Leptomastidea abnormis', a hymenopterous parasitoid of the citrus mealybug #Planococcus citri'." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306967.

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10

Kerns, David L., and Tony Tellez. "Commercial Evaluation of M-96-015 for Control of Citrus Mealybug, Woolly Whitefly and Citrus Thrips in Lemons." College of Agriculture, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/220526.

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M-96-015 did not appear to effectively control woolly whitefly but does appear to kill citrus mealybug. However, as with other insecticides coverage is a problem. The real benefit of M-96-015 towards citrus mealybug would occur if it prevented their spread. However, we were not able to measure this in this study. As with previous trials, M-96-015 is an effective citrus thrips material.

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11

Epstein, Helen. "Chromosomal proteins from a mealybug, Planococcus citri." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386704.

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12

Andrade, Adilma Cristina Delgado. "Cochonilhas-algodão associadas ao cafeeiro em estufas." Master's thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/8297.

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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia<br>The main objective of Centro de Investigação das Ferrugens do Cafeeiro, Instituto de Investigação Científica Tropical (CIFC/IICT) is to contribute for the development of coffee varieties resistant to coffee leaf rust, Hemileia vastatrix. Mealybugs are a major phytossanitary problem of coffee varieties maintained by CIFC/IICT, due to their interference with the production of young coffee leafs necessary for the inoculation of fungi. The aims of the present work were: a) to identify the mealybug species associated with commer

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13

Martínez, Blay Victoria. "Biology and management, by application of classical biological control, of the invasive mealybug Delotoccoccus aberiae (Hemiptera:Pseudococcidae) in citrus orchards in Spain." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/106363.

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Delottococcus aberiae (Hemiptera: Pseudococcidae) es un pseudocóccido invasor originario del África subsahariana que fue detectado causando graves daños en cítricos del este de España en el año 2009. Debido al desconocimiento existente sobre esta especie, la gestión de D. aberiae se ha llevado a cabo mediante el uso de tratamientos químicos autorizados contra este tipo de insectos. Sin embargo, la última Directiva Europea (2009/128/EC) sobre el uso sostenible de productos fitosanitarios estipula que la aplicación de plaguicidas en el ámbito agrícola debe reducirse, promoviendo estrategias de m

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14

Morandi, Filho Wilson José. "Cochonilhas-farinhentas associadas à videira na Serra Gaúcha, bioecologia e controle de Planococcus citri (Risso, 1813) (Hemiptera: Pseudococcidae)." Pelotas, 2008. http://repositorio.ufsc.br/xmlui/handle/123456789/91230.

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15

Campos, Leonor Pedroso Mendes da Silva. "Efeito de factores de natureza visual na localização de fontes de feromona pelos machos de cochonilha-algodão dos citrinos, Planococcus citri (Risso)." Master's thesis, 2008. http://hdl.handle.net/10400.5/612.

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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia<br>This work is part of the Project POCI/AGR/57580/2004 and was aimed at studying the influence of visual cues (colour and silhouette) in short-range attraction of the adult males of the citrus mealybug, Planococcus citri (Risso), in response to a pheromone source, and characterizing the internal morphology of its three pairs of simple eyes. Colour preference was tested in field (with chemical stimuli) and laboratory (without chemical stimuli), using four coloured sticky traps – white, green, yellow and red. The study of

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16

Pape, Albert James, and 艾伯特. "An Alternative Method for the Synthesis of Female Sex Pheromone of the Citrus Mealybug, Planococcus citri." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/27814014293955241922.

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碩士<br>靜宜大學<br>應用化學系<br>104<br>A new synthetic route to the sex pheromone of the female citrus mealybug (Planococcus citri) is developed. Starting from (+)-α-pinene (11), Pd-catalyzed allylic oxidation yields enone product 8. Ruthenium-catalyzed oxidative decarboxylation affords acid product 9. Olefination is accomplished using a Mg-TiCl4 bimetallic reagent to afford 10. Finally, reduction by LiAlH4 and acetylation with acetic anhydride gives final product (+)-cis-planococcyl acetate (cis-1). This procedure offers an alternative path to obtain the pheromone, which has application as an environm

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17

HUANG, ZHEN-SHENG, and 黃振聲. "The population ecology and development of sex pheromone trapping system in the citrus mealybug, planococcus citri (Risso) on guava." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/39746439607717940574.

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18

Su, Chung Kuang, and 蘇重光. "Comparison of Two Endoparasitoids, Anagyrus sawadii Ishii and Leptomastix dactylopii Howard Parasitizing in the Citrus Mealybug Planococcus citri (Risso) (Homoptera:Pseudococcidae)." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/52320378323552774978.

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碩士<br>國立中興大學<br>昆蟲學系<br>83<br>Laboratory and greenhouse experiments were conducted to study the relationship between the citrus mealybug, Planococcus citri (Risso) and its two endoparasitoids, Anagyrus sawadii Ishii and Leptomastix dactylopii Howard. A. sawadii parasitizing the first and the second instar nymphs but preferred the latter instar nymphs.L. dactylopii parasitizing the third instar nymphs and the adult but preferred the adult.In choice tests, A. sawadii parasitizing on the first

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