For powdery mildew on grapevines, it it better to use Mancozeb or Anti Rot - or use of both in a spray program
Fruit and Citrus • Diseases
Yates Mancozeb Plus is registered to control powdery mildew on grapevines.
Anti-Rot is registered for treating downy mildew on grape vines.
We recommend using these products separately 24 hours apart.
Applying them both at the same time may cause stress to the grapevines and damage them.
Answered: 13 Dec, 2021