Fruit IPM Fruit IPM Grape Black Rot
Approximate number of wetting hours required for foliar
infection
by grape black rot at different temperatures
Temp F |
Hours of Wetness |
50 |
24 |
55 |
12 |
60 |
9 |
65 |
8 |
70 |
7 |
75 |
7 |
80 |
6 |
85 |
9 |
90 |
12 |
Source R.A. Spotts, Ohio State University
Data represent Concord, Catawba, Aurora and Baco Noir.
