Photograph of Captafol under the microscope

This useful foliage-protectant fungicide is a member of the dicarboximide class of pesticides that was first introduced in 1961. The dicarboximides are some of the safest of all available pesticides and are even recommended for lawn and garden use. The mechanism of action in the dicarboximide class appears to be same for all members of the family. They probably act nonspecifically, although the nature of reactions between fungicides and fungal cell components is not very clearly defined. It is generally believed that thiol or alkylthio groups of fungal metabolic enzymes are the most likely in vivo reaction sites. In addition to home use, dicarboximides are utilized primarily as foliage dusts and sprays on fruits, vegetables, and ornamentals.

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