ven118lec8_gublerrootdiseaseslectsv

ven118lec8_gublerrootdiseaseslectsv - VEN 118 Root Diseases...

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VEN 118 Root Diseases of Grapevine in California and their control
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Root Diseases Vine Declines Phaeoacremonium aleophilum (Togninia minima) Phaeomoniella chlamydosporum Armillaria Root Rot Phytophthora Root Rot Black Foot Phymatotrichum Root Rot Verticillium Wilt
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Vine Declines Young vines – Nursery involvement Symptoms – External-root rot, dieback, decline, foliage firing, fruit raisining – Internal-vasc discoloration, drying, pith blackening Pathogenicity – Soilborne inoculum—Pc= chlamydospores, Pa= (perithecia??) – Entrance thru non-wounded epidermis, wounds in bark or roots Rootstock susceptibility – Phylloxera resistant rootstocks are more susceptible Stress Predispositon – Disease always associated with either water deficit, early/heavy fruiting, or poor planting (“J” rooting)
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Many vineyards have been removed because of Petri disease and vine decline caused by Phaeoacremonium spp. and Pa. chlamydospora
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Armillaria Root Rot —A. mellea Prevalent in north coast area
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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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ven118lec8_gublerrootdiseaseslectsv - VEN 118 Root Diseases...

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