Gray Mold is one of the hardest foliage diseases to slow down in my garden. Black tomatoes and green when ripe types are the most susceptible. Daconil doesn't seem to prevent it from starting up and once it does it is usually only a matter of time before the plant will succumb. I did find that alternating Daconil and a copper spray was more effective in preventing outbreaks. Once an outbreak starts then the only thing that has been fairly successful is spraying with a dilute bleach spray using a slightly stronger than normal solution and repeating two or three days in a row, then following up with a copper spray. The spraying has to be very thorough each time and spray the ground and surrounding plants as well. The spraying must begin as soon as you see signs of Gray Mold or it will not be successful. Waiting to begin treatment just assures failure with this disease. This treatment also works fairly well with Septoria which just decimates plants during prolonged rainy spells.
Bill
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