Ben from Russellville, Ky writes
Bonide Mancozeb Flowable with Zinc Concentrate is a broad spectrum fungicide for use on a wide variety of ornamentals and vegetables. Without knowing exactly which disease you have, we can't say with certainty that it will treat your problem. It is not labeled to be used on zucchini. We recommend speaking with a master gardener at your local extension office to attempt to identify which fungal disease you may be dealing with so that we can make an accurate product recommendation.
Answer last updated on: 06/25/2018