Master Gardener Laura Simpson answers the question of a reader with a persistent problem.
Q. It happened again! I wrote last year about a white coating on my grapes which you diagnosed as fungus. Lost all the grapes. This year there are many bunches of grapes, all covered with the same white coating. I sprayed with copper but to no avail. The leaves and vines are involved with spots on the vines and rust-colored spots on the leaves. Any hope for the vine or should it be removed?Powdery mildew is very common in grapes, especially in our Mediterranean climate.
Since you report rust-colored spots on the leaves and fruit loss, I suspect your grapes may be infected with another, additional, disease. Measles , Pierce’s disease, or Phomopsis.
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