Controlling Black Rot in Concord grapes

Asked July 7, 2018, 11:38 AM EDT

Hi, I have disposed of all black rot from last year, I lost every vine. Pruned and now seeing some in locations. 15 vines. 10 years old, no issues till last year. What Fungicide from Concord Grapes. They are ultra sensitive.

Middlesex County Massachusetts

1 Response

Concords are fairly disease resistant but they are sensitive to copper and sulfur, two traditionally organic fungicides.
Fungicides to protect the fruit from black rot are necessary for about 4 to 8 weeks after bloom and then the fruit becomes resistant.
The disease requires wet conditions to infect.
Captan is a readily available fungicide that is fair to good on black rot.
Immunox Multi Purpose Fungicide has a different active ingredient which is very good commercial growers will often combine the two.
Spray should be applied on a 7 to 10 day schedule more often if it rains and less often if it is dry.
Drop me an email and I can send you a guide to pest control in small vineyards.