Mills from Yorktown, Va writes
Bonide Mancozeb Flowable with Zinc Concentrate is labeled to control phytophthora blight on certain flowering plants, however it is not labeled for root rot. Depending on the type of plants you are treating, you may need a biological fungicide such as Nova Green Companion. This article has great tips on non-chemical prevention of this disease.
Answer last updated on: 01/23/2019