Diseases
Powdery mildew of grapevine
Vitis vinifera L. subsp. vinifera
A fungal disease of grapes caused by Erysiphe necator, affecting all green organs of the plant and characterized by the appearance of a white powdery coating and tissue deformation.
In the reference 3 varieties crop Wine grape, where this is mentioned in the description.
The causative agent of the disease is the obligate biotrophic fungus Erysiphe necator (anamorph Oidium tuckeri). Unlike many other mycoses, it does not require free moisture for its development; high air humidity is sufficient. The pathogen affects all green parts of the grapevine: leaves, shoots, inflorescences, and berries.
Symptoms include the appearance of "flag shoots" developing from infected buds, which are covered with a powdery coating and are stunted in growth. On berries, the infection manifests as deformation, skin cracking, and rotting, accompanied by a characteristic smell of rotten fish. When shoots are affected, dark red or brown necrotic spots are formed.
Cultivated grape Vitis vinifera has extremely low natural resistance to the pathogen. In modern breeding, introgression of resistance genes from other grape species, designated with the prefix Ren (e.g., Ren3, Ren9, and Run1), which are identified by DNA marker methods, is used to increase immunity.
General information about the subject — on the page Powdery mildew.
Varieties of Wine grape mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
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