Black Rot Disease
I need help! I have a small backyard grape orchard with a variety of grapes. Each year I get tons of grapes, however, by early July they get black rot. I have cleaned up all mummies at the end of the harvest and use a sulfur spray once a week. Please give me some advice on an effective spray as well as any other advice that will help me next year. Thanks in advance!
St. Louis County Missouri
An early cover spray with copper would probably help. You can also try captan or myclobutanil instead of sulfur later on. Don't apply sulfur when temperatures are over 85 degrees F. There is a spray schedule at the following address: