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Dissertations / Theses on the topic 'And Phytophthora diseases'

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Published: 5 June 2025

Last updated: 2 August 2025

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1

Chambers, Susan M. "Phytophthora root rot of chestnut /." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phc4449.pdf.

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2

Fitzpatrick-Peabody, Erica. "Methodology and Assessment of the Susceptibility of Potato Genotypes to Phytophthora Erythrosetpica Causal Organism of Pink Rot." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/Fitzpatrick-PeabodyER2008.pdf.

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3

McCarren, Kathryn. "Saprophytic ability and the contribution of chlamydospores and oospores to the survival of Phytophthora cinnamomi." Thesis, McCarren, Kathryn (2006) Saprophytic ability and the contribution of chlamydospores and oospores to the survival of Phytophthora cinnamomi. PhD thesis, Murdoch University, 2006. https://researchrepository.murdoch.edu.au/id/eprint/190/.

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Phytophthora cinnamomi has been recognised as a key threatening process to Australia's biodiversity by the Commonwealth's Environment Protection and Biodiversity Conservation Act 1999. Despite over 80 years of extensive research, its exact mode of survival is still poorly understood. It is widely accepted that thin- and thick-walled chlamydospores are the main survival propagules while oospores are assumed to play no role in the survival of the pathogen in the Australian environment, yet evidence is limited. The saprophytic ability of the pathogen is still unresolved despite the important r

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4

McCarren, Kathryn. "Saprophytic ability and the contribution of chlamydospores and oospores to the survival of Phytophthora cinnamomi." McCarren, Kathryn (2006) Saprophytic ability and the contribution of chlamydospores and oospores to the survival of Phytophthora cinnamomi. PhD thesis, Murdoch University, 2006. http://researchrepository.murdoch.edu.au/190/.

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Phytophthora cinnamomi has been recognised as a key threatening process to Australia's biodiversity by the Commonwealth's Environment Protection and Biodiversity Conservation Act 1999. Despite over 80 years of extensive research, its exact mode of survival is still poorly understood. It is widely accepted that thin- and thick-walled chlamydospores are the main survival propagules while oospores are assumed to play no role in the survival of the pathogen in the Australian environment, yet evidence is limited. The saprophytic ability of the pathogen is still unresolved despite the important r

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5

Clayton, Robert Charles. "Integrated control of potato late-blight (Phytophthora infestans)." Thesis, Bangor University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357249.

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6

Tynan, K. M. "Evaluation of Banksia species for response to Phytophthora infection /." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09pht987.pdf.

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7

au, 30365216@student murdoch edu, and Mee-Hua Wong. "Phosphite induces morphological and molecular changes in Phytophthora species." Murdoch University, 2006. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20070717.155119.

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The influence of the chemical phosphite on Phytophthora species was investigated by studying the morphological and molecular changes induced by phosphite. In vitro experiments were conducted to study the effects of phosphite on five isolates of each of five species of Phytophthora grown in low phosphate defined medium. Sensitivity to phosphite varied greatly among the five isolates of each species and resulted in a significant interaction between isolate and phosphite effect. The EC50 values ranged from less than 5 to 10 ìg/ml for P. cinnamomi, to 13 ìg/ml for P. nicotianae, to 27 ìg/ml for P

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8

Wong, Mee-Hua. "Phosphite induces morphological and molecular changes in Phytophthora species." Thesis, Wong, Mee-Hua (2006) Phosphite induces morphological and molecular changes in Phytophthora species. Masters by Research thesis, Murdoch University, 2006. https://researchrepository.murdoch.edu.au/id/eprint/413/.

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The influence of the chemical phosphite on Phytophthora species was investigated by studying the morphological and molecular changes induced by phosphite. In vitro experiments were conducted to study the effects of phosphite on five isolates of each of five species of Phytophthora grown in low phosphate defined medium. Sensitivity to phosphite varied greatly among the five isolates of each species and resulted in a significant interaction between isolate and phosphite effect. The EC50 values ranged from less than 5 to 10 mcg/ml for P. cinnamomi, to 13 mcg/ml for P. nicotianae, to 27 mcg/ml

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9

Wong, Mee-Hua. "Phosphite induces morphological and molecular changes in Phytophthora species." Wong, Mee-Hua (2006) Phosphite induces morphological and molecular changes in Phytophthora species. Masters by Research thesis, Murdoch University, 2006. http://researchrepository.murdoch.edu.au/413/.

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The influence of the chemical phosphite on Phytophthora species was investigated by studying the morphological and molecular changes induced by phosphite. In vitro experiments were conducted to study the effects of phosphite on five isolates of each of five species of Phytophthora grown in low phosphate defined medium. Sensitivity to phosphite varied greatly among the five isolates of each species and resulted in a significant interaction between isolate and phosphite effect. The EC50 values ranged from less than 5 to 10 mcg/ml for P. cinnamomi, to 13 mcg/ml for P. nicotianae, to 27 mcg/ml

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10

uk, siricordcc@yahoo co, and Cornelia Charito Siricord. "Detection of Phytophthora species by MALDI-TOF mass spectrometry." Murdoch University, 2005. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20070717.125452.

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Phytophthora diseases have caused worldwide economic, social and environmental impacts for decades. Once their presence is confirmed, they are difficult to eradicate. To reduce and manage the damage inflicted by the pathogen, fast and reliable disease management protocols are required. Tests that enable the rapid and reliable identification of the pathogen assist greatly in disease management. Phytophthora species are traditionally not only detected by baiting but also by plating of symptomatic tissue on selective media. Species can be identified by the characteristics of the mycelium growing

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11

Pereira, J. L. M. "Alternative strategies for the chemical control of Phytophthora pod rot of cocoa in Bahia, Brazil." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384415.

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12

King, Michaela. "The phosphite responsive transcriptome of phytophthora cinnamomi." Thesis, King, Michaela (2007) The phosphite responsive transcriptome of phytophthora cinnamomi. PhD thesis, Murdoch University, 2007. https://researchrepository.murdoch.edu.au/id/eprint/132/.

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Phosphite has been used to effectively control the soil borne plant pathogen Phytophthora cinnamomi in many horticultural crops, forest trees and natural ecosystems. However, the molecular mechanisms behind phosphite action on this pathogen are poorly understood. Several studies have shown that phosphite inhibits growth and zoospore production of P. cinnamomi and in addition induces significant physiological and metabolic changes in the mycelium. As an approach to understanding the mechanisms and relevance of these changes in the pathogen, the effect of phosphite on gene expression was inve

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13

King, Michaela. "The phosphite responsive transcriptome of Phytophthora cinnamomi /." King, Michaela (2007) The phosphite responsive transcriptome of phytophthora cinnamomi. PhD thesis, Murdoch University, 2007. http://researchrepository.murdoch.edu.au/132/.

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Phosphite has been used to effectively control the soil borne plant pathogen Phytophthora cinnamomi in many horticultural crops, forest trees and natural ecosystems. However, the molecular mechanisms behind phosphite action on this pathogen are poorly understood. Several studies have shown that phosphite inhibits growth and zoospore production of P. cinnamomi and in addition induces significant physiological and metabolic changes in the mycelium. As an approach to understanding the mechanisms and relevance of these changes in the pathogen, the effect of phosphite on gene expression was inve

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14

Sharma, Navin K. "Pathogenicity of Phytophthora palmivora (Butl.) Butl. on papaya in vitro." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305628.

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15

Zondo, Patience Thembelihle. "Assessment of inoculation techniques to evalute apple resistance to Phytophthora cactorum." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52141.

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Thesis (MSc)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: Phytophthora cactorum (Lebert & Cohn) Schrot. is the primary cause of crown, collar and root rot diseases of apple (Malus domestica Borkh.) trees worldwide. This pathogen is most destructive in commercial apple orchards under waterlogged soil conditions and has recently been identified as causing serious disease in some South African apple orchards. Crown, collar and root diseases are difficult to control because of their unpredictability and catastrophic nature. The use of resistant cultivars and rootstocks is economic

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16

Darby, Judith. "Systemic acquired resistance to Phytophthora infestans in potatoes and tomatoes." Thesis, University of Hull, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321051.

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17

Matheron, Mike, and Joe Matejka. "Seasonal Variation in Susceptibility of Citrus Rootstocks to Phytophthora." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/215689.

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Phytophthora parasitica and P. citrophthora are routinely recovered from diseased citrus groves in Arizona. Stem sections were collected monthly from Citrus macrophylla, rough lemon, .sour orange, Cleopatra mandarin, Troyer citrange and Citrus volkameriana. Stem pieces were wounded, inoculated with mycelium of P. parasitica or P. citrophthora, then incubated for 7 days at 21° C in moist chambers. For all tested rootstocks, the smallest cankers were produced on tissue collected in December, January and February, the winter dormancy period for citrus in Arizona. The period of higher susceptibili

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18

Olsson, Christer H. B. "Diagnosis of root-infecting Phytophthora spp. /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5483-2.pdf.

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19

Siricord, Cornelia Charito. "Detection of Phytophthora species by MALDI-TOF mass spectrometry." Thesis, Siricord, Cornelia Charito (2005) Detection of Phytophthora species by MALDI-TOF mass spectrometry. PhD thesis, Murdoch University, 2005. https://researchrepository.murdoch.edu.au/id/eprint/314/.

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Phytophthora diseases have caused worldwide economic, social and environmental impacts for decades. Once their presence is confirmed, they are difficult to eradicate. To reduce and manage the damage inflicted by the pathogen, fast and reliable disease management protocols are required. Tests that enable the rapid and reliable identification of the pathogen assist greatly in disease management. Phytophthora species are traditionally not only detected by baiting but also by plating of symptomatic tissue on selective media. Species can be identified by the characteristics of the mycelium growi

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20

Siricord, Cornelia Charito. "Detection of Phytophthora species by MALDI-TOF mass spectrometry." Siricord, Cornelia Charito (2005) Detection of Phytophthora species by MALDI-TOF mass spectrometry. PhD thesis, Murdoch University, 2005. http://researchrepository.murdoch.edu.au/314/.

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Phytophthora diseases have caused worldwide economic, social and environmental impacts for decades. Once their presence is confirmed, they are difficult to eradicate. To reduce and manage the damage inflicted by the pathogen, fast and reliable disease management protocols are required. Tests that enable the rapid and reliable identification of the pathogen assist greatly in disease management. Phytophthora species are traditionally not only detected by baiting but also by plating of symptomatic tissue on selective media. Species can be identified by the characteristics of the mycelium growi

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21

Johnson, Regina. "Stream baiting for sudden oak death : fluvial transport and ecohydrology of the invasive plant pathogen Phytophthora ramorum in Western Washington State /." Online pdf file accessible through the World Wide Web, 2008. http://archives.evergreen.edu/masterstheses/Accession86-10MES/2008Johnson_RMMESthesis.pdf.

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22

Andersson, Björn. "Sexual reproduction in Phytophthora infestans : epidemiological consequences /." Uppsala : Dept. of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200777.pdf.

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23

Pilbeam, Ros. "Effects of phosphite on disease development and histological responses in Eucalyptus marginata infected with Phytophthora cinnamomi." Thesis, Pilbeam, Ros (2003) Effects of phosphite on disease development and histological responses in Eucalyptus marginata infected with Phytophthora cinnamomi. PhD thesis, Murdoch University, 2003. https://researchrepository.murdoch.edu.au/id/eprint/260/.

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Phosphite is currently used for the management of Phytophthora cinnamomi in native plant communities. A greater understanding of how phosphite affects the host-pathogen interaction is required in order to determine the most effective treatment. This thesis aimed to investigate the effects of applied phosphite concentration on phytotoxicity, in planta concentration of phosphite, disease development and anatomical responses of Eucalyptus marginata. Spraying the foliage to run-off with 7.5 and 10 g phosphite/L led to the development of severe leaf necrosis within 7 days, with greater than 60%

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24

Pilbeam, Ros. "Effects of phosphite on disease development and histological responses in Eucalyptus marginata infected with Phytophthora cinnamomi." Murdoch University, 2003. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040820.140206.

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Phosphite is currently used for the management of Phytophthora cinnamomi in native plant communities. A greater understanding of how phosphite affects the host-pathogen interaction is required in order to determine the most effective treatment. This thesis aimed to investigate the effects of applied phosphite concentration on phytotoxicity, in planta concentration of phosphite, disease development and anatomical responses of Eucalyptus marginata. Spraying the foliage to run-off with 7.5 and 10 g phosphite/L led to the development of severe leaf necrosis within 7 days, with greater than 60% of

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25

Santamaria, Luisa. "Evaluation of lima bean (Phaseolus lunatus) germplasm for resistance to downy mildew, and epidemiological and biological studies of its causal agent, Phytophthora phaseoli." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 159 p, 2008. http://proquest.umi.com/pqdweb?did=1456289191&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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26

Bunny, F. "The biology, ecology and taxonomy of Phytophthora citricola in native plant communities in Western Australia /." Access via Murdoch University Digital Theses Project, 1996. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20061122.122739.

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27

Matheron, M., and J. Matejka. "Sodium Tetrathiocarbonate - Potential New Fungicide for Control of Phytophthora in Citrus Groves." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/215699.

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Sodium tetrathiocarbonate (STTC) releases carbon disulfide when added to water and applied to soil. Laboratory tests were conducted to determine the effect of this chemical on growth and sporulation of Phytophthora citrophthora and P. parasitica, which cause Phytophthora gummosis and mot rot of citrus in Arizona Zoospore motility, zoospore cyst viability, sporangia production, and mycelia' growth were significantly reduced in the presence of STTC Results of laboratory tests suggest that application of S7TC as a soil drench could reduce inoculum production and subsequent new infections by P. ci

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28

Matheron, M., J. Matejka, and D. Bacon. "Distribution of Two Species of Phytophthora Within the Citrus Acreage in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/215712.

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Pkvtophthora citrophthora and P. parasitica cause gummosis and root rot of citrus trees in Arizona. A disease survey was initiated to determine the relative distribution of each pathogen within the citrus acreage of Maricopa and Yuma Counties. Both pathogens were recovered at the same time from 75% and 17% of orchards containing Phytophthora in Maricopa and Yuma County, respectively. P. citrophthora alone was found in 15% of the groves containing Phytophthora in Yuma County, while P. parasitica alone was detected in 25% and 68% of the citrus plantings containing Phytophthora in Maricopa and Yu

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29

Matheron, Michael, Martin Porchas, and Michael Maurer. "Effect of Temperature and Moisture on Survival of Phytophthora in Citrus Grove Soil." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/223839.

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Before replanting a citrus grove in Arizona, different preplant cultural activities may be performed, such as immediate replanting of the new citrus grove, allowing soil to lay fallow for various lengths of time, or planting the site to alfalfa for one or more years before the new citrus grove is established. A study was conducted to compare the effect of these different cultural preplant practices on the survival of Phytophthora in citrus grove soils. In June, 1998, and July, 1999, a total of 18 soil samples were collected within mature lemon groves. Each initial bulk sample was pretested, fo

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30

Bunny, Felicity J. "The biology, ecology and taxonomy of Phytophthora citricola in native plant communities in Western Australia." Thesis, Bunny, Felicity J. (1996) The biology, ecology and taxonomy of Phytophthora citricola in native plant communities in Western Australia. PhD thesis, Murdoch University, 1996. https://researchrepository.murdoch.edu.au/id/eprint/492/.

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The objectives of the project were to develop an understanding of the disease dynamics caused by Phytophthora citricola in native plant communities in the south of Western Australia. Prior to 1983, the pathogen had only been reported twice from Australian forests. Since then, P. citricola has been extensively recorded from plant communities north and south of Perth, and is currently the second most frequently recovered Phytophthora species from the northern jarrah forest and the northern sandplains. The objectives were addressed by examining the biology, ecology and taxonomy of isolates of

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31

Bunny, Felicity J. "The biology, ecology and taxonomy of Phytophthora citricola in native plant communities in Western Australia." Murdoch University, 1996. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20061122.122739.

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The objectives of the project were to develop an understanding of the disease dynamics caused by Phytophthora citricola in native plant communities in the south of Western Australia. Prior to 1983, the pathogen had only been reported twice from Australian forests. Since then, P. citricola has been extensively recorded from plant communities north and south of Perth, and is currently the second most frequently recovered Phytophthora species from the northern jarrah forest and the northern sandplains. The objectives were addressed by examining the biology, ecology and taxonomy of isolates of P.

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32

Matheron, M., and J. Matejka. "Phytophthora Gummosis and Root Rot of Citrus-Effect of Temperature on Disease Development." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/215726.

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Experiments were conducted to examine the effect of temperature on development of Phytophthora gummosis and root rot of citrus as well as the influence of temperature on sporulation of Phytophthora citrophthora and P. parasitica. Maximum production of sporangia by each fungus occurred at 25 C, while slight or no sporangia production occurred at 10, 15, and 35 C. Minimal growth of lesions was observed when stems of rough lemon were inoculated with P. citrophthora or P. parasitica and incubated at 5 and 30 C or 10 and 30 C, respectively. The inhibitory and stimulating effect of certain temperatu

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33

au, nolad@iprimus com, and Nola Kim D'Souza. "Pathosystem development, characterisation and genetic dissection of the soil pathogen Phytophthora medicaginis and the model legume Medicago truncatula : a view to application of disease resistance in susceptible legume species." Murdoch University, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20090423.105414.

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Phytophthora medicaginis is an important soil-borne oomycete pathogen of lucerne (Medicago sativa) and chickpea (Cicer arietinum) within Australia and overseas. To understand the host/pathogen interaction, a pathosystem was developed using the model legume Medicago truncatula. Using the resources developed for genetics and molecular characterisation in this model plant, the aim of this research was to understand the interaction between M. truncatula and P. medicaginis, with a view to improving resistance to this important pathogen in related legumes. To observe and characterise the interactio

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34

Wicks, T. J. "Phytophthora crown rot of almond and cherry trees : pathogens, rootstock and scion susceptib[i]lity and control /." Title page, table of contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phw637.pdf.

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35

Pule, Boitumelo Bronwen. "Population structure of Phytophthora infestans in selected central, Eastern and Southern African countries." Thesis, Stellenbosch : Stellenbosch University, 2010. http://hdl.handle.net/10019.1/5461.

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Thesis (MSc)--Stellenbosch University, 2010.<br>ENGLISH ABSTRACT: Late blight caused by Phytophthora infestans on potato and tomato causes major economic losses worldwide. Until the 1980s, P. infestans populations outside its centre of origin (either central Mexico or the Andean region) only consisted of one mating type (A1), which prevented the pathogen from reproducing sexually. Pathogen populations outside the centre of origin most likely only consisted of a few genotypes prior to the 1980’s. Pan globally, these genotypes probably first consisted of genotype/s that had mitochondrial D

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36

Lucas, Anne. "Water stress and disease development in Eucalyptus marginata (jarrah) infected with Phytophthora cinnamomi." Thesis, Lucas, Anne (2003) Water stress and disease development in Eucalyptus marginata (jarrah) infected with Phytophthora cinnamomi. PhD thesis, Murdoch University, 2003. https://researchrepository.murdoch.edu.au/id/eprint/167/.

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The south-west of Western Australia has a Mediterranean climate and flora endemic to this area, including the keystone species, jarrah (Eucalyptus marginata), have adapted to the droughted summer conditions. The introduction of an exotic soil borne pathogen, Phytophthora cinnamomi, has challenged the survival of this and many other species. The expectation might be that plants stressed by drought are more susceptible to disease and this study examined the development of disease caused by P. cinnamomi in E. marginata and the significance of water status to that development. Seedlings of E. m

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Lucas, Anne. "Water stress and disease development in Eucalyptus marginata (jarrah) infected with Phytophthora cinnamomi." Murdoch University, 2003. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040820.13290.

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Queiroz, Brigida Pimentel Villar de [UNESP]. "Isolamento e seleção de rizobactérias para promoção de crescimento e controle de Phytophthora parasitica em citros." Universidade Estadual Paulista (UNESP), 2003. http://hdl.handle.net/11449/126267.

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Made available in DSpace on 2015-08-20T17:09:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2003. Added 1 bitstream(s) on 2015-08-20T17:27:21Z : No. of bitstreams: 1 000198515.pdf: 487806 bytes, checksum: 3dd00250126b06e0ce00ceb1a05efad4 (MD5)

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Queiroz, Brigida Pimentel Villar de. "Isolamento e seleção de rizobactérias para promoção de crescimento e controle de Phytophthora parasitica em citros /." Rio Claro, 2003. http://hdl.handle.net/11449/126267.

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40

Matheron, M., and J. Matejka. "Evaluating the Potential Threat to Citrus Plantings from Phytophthora Parasitica Originating from Noncitrus Hosts." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/215727.

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The relative virulence of Phytophthora parasitica recovered from citrus and other plants to rough lemon was investigated Isolates of Phytophthora parasitica from citrus were highly virulent to rough lemon seedlings, causing crown rot and significant reduction of root weight. Isolates of the pathogen from noncitrus hosts caused slight damage to rough lemon, with no crown rot and only minor reduction of root weight. Evidently, isolates of P. parasitica from several noncitrus hosts do not pose a serious threat to citrus groves.

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41

Widmark, Anna-Karin. "The late blight pathogen, Phytophthora infestans : interaction with the potato plant and inoculum sources /." Uppsala : Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, 2010. http://epsilon.slu.se/201002.pdf.

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42

Matheron, M., and J. Matejka. "Comparative Control of Phytophthora Root Rot of Citrus with Sodium Tetrathiocarbonate, Metalaxyl, and Dosetyl-Al." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/215725.

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This study was initiated to evaluate and compare the effect of root and soil treatments with sodium tetrathiocarbonate (STTC) (Enzone), metalaxyl (Ridomil), and fosetyl-Al (Aliette) on subsequent development of Phytophthora root rot on citrus. Disease development was significantly reduced on rough lemon seedlings treated with STTC or metalaxyl compared to untreated plants when this citrus rootstock was inoculated with sporangia of P. citrophthora or P. parasitica. Growth of rough lemon seedlings in soil naturally infested with P. parasitica that was treated one week before planting with STTC o

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Matheron, M., and J. Matejka. "Seasonal Changes in Extent of Colonization of Citrus Root Tissue by Phytophthora citrophthora and P. parasitica." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/215750.

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For 24 consecutive months, root pieces were collected from field -grown Lisbon lemon trees established on Citrus aurantium (sour orange), C. jambhiri (rough lemon), and C. volkameriana rootstocks. Root segments were wounded, inoculated with Phytophthora citrophthora or P. parasitica, and incubated for 96 hr in moist chambers. Smaller lesions developed during Jan -Feb than during Jul-Oct on root pieces of all tested rootstocks inoculated with P. citrophthora as well as root pieces of C aurantium inoculated with P. parasitica. Apparently there is a seasonal variation in the susceptibility of cit

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Mahmoud, Mohamed Ahmed Yosra. "Studies on mango soilborne diseases with special reference to Phytophtora root rot." Doctoral thesis, Università di Catania, 2013. http://hdl.handle.net/10761/1454.

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Mango (Mangifera indica L.) is an important fruit crop in many tropical and subtropical countries. Recently, mango has been introduced into Italy mainly in some provinces of Sicily. However, its future as approaching commodity in Sicilian agriculture is threatened by diverse biotic and abiotic threats. This study aimed to assess the occurrence of the fungal soilborne diseases and their causal agents in the island. Special reference was provided to Phytophthora species, oomycetes -like fungi that cause Phytophthora root and crown rot on mango. Surveys were conducted over summer and spring (201

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Matheron, M. E., and R. E. Call. "Field Testing of Potential New Fungicides for Control of Phytophthora Root and Crown Rot of Chile Pepper." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/214719.

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Root and crown rot and blight of chile peppers is caused by the soil -borne plant pathogenic fungus Phytophthora capsici. The root and crown rot phases of the disease are favored by saturated soil conditions, while rainfall accompanied by wind helps initiate the blight phase. The purpose of this study was to evaluate potential new fungicides for disease control. Some treatments of Aliette and Fluazinam as well as Ridomil tended to reduce the incidence of disease in this trial. However, the high variability in disease incidence among the replicates of each treatment prevented the demonstration

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Matheron, Michael, and Martin Porchas. "Analysis of Rootstocks and New Fungicides for Control of Phytophthora Root Rot and Gummosis in Arizona Citrus Groves." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/220515.

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Experiments were initiated to evaluate potential new citrus rootstocks for their relative tolerance or resistance to root rot and gummosis caused by Phytophthora citrophthora and P. parasitica and to determine the efficacy of potential new fungicides for disease control. In greenhouse trials conducted in 1994 and 1995, the range of root loss due to Phytophthora in the 44 different rootstocks tested ranged from 26-96 %. Rootstocks sustaining 80% or less root loss will be evaluated further to identify those with superior tolerance to Phytophthora. In growth chamber experiments, the same rootstoc

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Aguayo, Silva Jaime Cristián. "Étude des conditions de l'émergence du phytophthora alni sur l'aulne glutineux." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0153/document.

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Depuis les années 1990, l'aulne glutineux, espèce clé des ripisylves, est affecté par un oomycète qui cause son dépérissement : Phytophthora alni subsp. alni (Paa). La genèse de Paa est liée à un événement d'hybridation interspécifique entre deux espèces proches, improprement nommées P. alni subsp. uniformis (Pau) et P. alni subsp. multiformis (Pam), car initialement considérées comme des variants de Paa. L'objectif de cette thèse était d'identifier les facteurs ayant pu jouer un rôle dans l'émergence de la maladie en Europe. Par une approche de génétique des populations, nous avons montré que

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Raftoyannis, Yannis. "Comparative study of the patterns of encystment and pathogenicity of zoospores of Phytophthora and Pythium spp. on a range of axenically-grown angiosperm roots." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287382.

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Camacho, Ernesto Robayo. "Diseases of floriculture crops in South Carolina evaluation of a pre-plant sanitation treatment and identification of species of Phytophthora /." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1256570254/.

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Vargas, Amilcar. "Management of seedling diseases caused by Oomycetes, Phytophthora spp., Phytopythium spp. and Pythium spp. using seed treatment in Ohio." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524060260234098.

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