Jim Childreess's Page

The main thing in preventing late blight in tomatoes is to keep the foliage dry. When you water it is best to water the plant at the bottom. If you feel that you need to use a mister or sprinkler it is best to water early in the morning so that the foliage has a chance to dry out. Also it is best to put your tomatoes where the foliage will dry out quickly after a rain.

If late blight becomes severe enough, the following chemicals can be used:

chlorothalonil, fixed copper, maneb or mancozeb.

Copper is the only one that can be used if you want to raise organic tomatoes.