Fungus in grapes?

Asked July 7, 2018, 10:53 AM EDT

Our grapes get these hard black spots on them and then they die. Do you know what it is and what we should do about it? The grapes are on an Arbor against our house. They overall are producing well but this is on most of the grapes. (See picture)

Montgomery County Maryland grapes fruit black rot

1 Response

This looks like black rot, a common fungal disease on grapes. You can minimize problems by removing infected fruit, cleaning up mummies, and pruning out leaves that surround fruit clusters. See more about it on our website. http://extension.umd.edu/hgic/plants/diseases-grapes

You will have to adhere to a spray schedule next spring. See the spray schedule from Va Tech. 'Table 3-8' for 'Spray Schedule for Grapes' and
'Table 3.3b' lists the – 'Effectiveness1 of Fungicides for Control of Grape Diseases'.
Immunox offers excellent control. http://extension.umd.edu/hgic/home-fruit-preventative-spray-schedule-and-management-common-problems

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