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This is a list of diseases of grapes (Vitis spp.). Bacterial diseases. Glassy-winged sharpshooter, the primary carrier of PD. Bacterial diseases;
Phomopsis cane and leaf spot is a disease that causes symptoms in the common grapevine species, Vitis vinifera, in many regions of the world. [2] This disease is mainly caused by the fungal pathogen, Phomopsis viticola, and is known to affect many cultivars of table grapes, such as Thompson Seedless, Red Globe, and Flame Seedless. [3]
Viral grape diseases (30 P) Pages in category "Grape diseases" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. *
Foliar symptoms typically begin appearing in mid-summer as irregular blotches on leaf blades at the base of infected grapevines. Over time, the blotches spread upward from the base to the top of the grapevine canopy. [9] [10] In red grape varieties, the blotches are red; in white grape varieties, the blotches may be pale green to pale yellow. [2]
Those symptoms are related to callose deposition at the sieve plates and subsequent degeneration of the phloem. Although no resistant cultivars of Vitis vinifera or rootstocks are known so far, the various grape varieties differ considerably as far as symptom severity is concerned. Chardonnay and Riesling are among the most vulnerable varieties.
The disease cycle begins with the overwintering structures. The grape black rot pathogen overwinters in many parts of the grape vine, especially mummies and lesions, and is able to overwinter on the vineyard floor. [3] In fact, "Viable lesions capable of producing conidia can persist in wood for at least 2 years."
The incubation period between infection and obvious symptoms is usually one year or more, depending on the response of the plant to both pathogen and environmental circumstances. [1] Flavescence dorée has the following symptoms: [1] leaves become yellow or red, depending on the variety; downward rolling of leaves; drying of stems and grapes
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