36
Average
Temp.
Degree of Infection (hrs)
(°F)
Light
Medium
Heavy
78
13
17
26
77
11
14
21
76
9.5
12
19
63 to 75
9
12
18
62
9
12
19
61
9
13
20
60
9.5
13
20
59
10
13
21
58
10
14
21
57
10
14
22
56
11
15
22
55
11
16
24
54
11..5
16
24
53
12
17
25
52
12
18
26
51
13
18
27
Approximate numbers of hours of wetting
required for primary apple scab infection
at different air temperatures
Apple Mills Table