Concord Grape Black Rot Fungicide

Asked April 4, 2020, 10:46 AM EDT

Can your recommend the best fungicide and application timing, etc... Have had big problem past two years in my backyard concord grapeing Thanks!! John Kaszyca

Livingston County Michigan

1 Response

Black rot is a common disease of backyard grapes. Focus is on the early shoot development to reduce leaf infections. To control fruit rot we spray just as bloom begins and again during bloom and after. The green fruit are susceptible to black rot infect for about 4 to 6 weeks and the sprays should go on about every 7 to 10 days, more often if you have rainy weather and less often if it is dry. Tree Fruit Spray mixes sold in garden stores contain the fungicides that are effective against black rot, but they often contain a insecticide as well. You need to look at the label to make sure that grapes are included in the crops allowed for the fungicide. There are 2 basic homeowner sprays out there and they both are restricted to only 2 applications so you will need to alternate between the two.
Please contact me directly and I will send you some more information. This format only allows us to exchange photos and not documents
Also check out the Grape pest management pages on the MSU Viticulture site
You may also want to check out Tom Zabadal's Viticulture channel on YOUTUB