ven118lec9_(phomopsisdownymildew)

ven118lec9_(phomopsisdownymildew) - VEN 118 Fungal Diseases...

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VEN 118 Fungal Diseases Continued
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Phomopsis Cane and Leaf Spot Phomopsis viticola Downy mildew Plasmopora viticola
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Phomopsis Cane and Leaf Spot Phomopsis viticola
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• Spore germination: 1 – 37 o C, optimum is 23 o C • Infection takes place within few hours in free water or near 100% RH • Only very young tissue is infected • Prolonged periods of rain and cool weather are prime factors in the development of an epidemic • Spread within vineyard is localized, remaining in close proximity to inoculum source Phomopsis cane and leaf spot Phomopsis viticola
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P. viticola overwinters as mycelium and pycnidia in bark. When wet,spores will excude from the pycnidia and washed or splashed by rain to shoot tips Phomopsis viticola – disease cycle and epidemiology
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Phomposis – Damage/Control Damage – Infections will weaken shoots that can break in strong winds or due to other circumstances Control – sanitation (remove as much diseased and dead wood as possible during pruning) Dormancy – application of liquid lime
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This note was uploaded on 09/29/2010 for the course VEN 81437 taught by Professor Larrywilliams during the Fall '10 term at UC Davis.

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ven118lec9_(phomopsisdownymildew) - VEN 118 Fungal Diseases...

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