Black spot leaf disease
Disease of plants / From Wikipedia, the free encyclopedia
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Black spot leaf disease is a physiological plant disorder that affects some grape varieties such as Concord. It is essentially a potassium deficiency that causes the leaves on a vine to turn purple and eventually black as chlorophyll is lost. For wine growers this lack of chlorophyll inhibits the vine's ability to transmit sugar to the grape, leaving the resulting grapes with a low brix count that may be less than ideal for wine making.[1]
Quick Facts Causal agents, Hosts ...
Black spot | |
---|---|
Causal agents | potassium deficiency fungi |
Hosts | grapevine |
Treatment | pruning fungicides |
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