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How to Manage Pests

Degree-days: Reference Tables

Cotton

Information about how to use this model in cotton

To find total degree-days for a day, locate the minimum and maximum temperatures and follow the column and row to where they intersect. For odd-numbered temperatures, interpolate between numbers.

Lower Threshold: 60.0°F        Method: Single Sine
Minimum temperatures
Max
temps
34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90
48 0 0 0 0 0 0 0 0
50 0 0 0 0 0 0 0 0 0
52 0 0 0 0 0 0 0 0 0 0
54 0 0 0 0 0 0 0 0 0 0 0
56 0 0 0 0 0 0 0 0 0 0 0 0
58 0 0 0 0 0 0 0 0 0 0 0 0 0
60 0 0 0 0 0 0 0 0 0 0 0 0 0 0
62 0 0 0 0 0 0 0 0 0 0 0 1 1 1 2
64 1 1 1 1 1 1 1 1 1 1 1 1 2 2 3 4
66 1 1 1 1 1 1 1 2 2 2 2 2 2 3 4 5 6
68 2 2 2 2 2 2 2 2 2 3 3 3 3 4 5 6 7 8
70 2 2 2 3 3 3 3 3 3 3 4 4 4 5 6 7 8 9 10
72 3 3 3 3 3 4 4 4 4 4 5 5 5 6 7 8 9 10 11 12
74 4 4 4 4 4 4 4 5 5 5 5 6 6 7 8 9 10 11 12 13 14
76 4 4 5 5 5 5 5 6 6 6 6 7 7 8 9 10 11 12 13 14 15 16
78 5 5 5 6 6 6 6 6 7 7 7 8 8 9 10 11 12 13 14 15 16 17 18
80 6 6 6 6 7 7 7 7 8 8 8 9 9 10 11 12 13 14 15 16 17 18 19 20
82 7 7 7 7 7 8 8 8 8 9 9 10 10 11 12 13 14 15 16 17 18 19 20 21 22
84 7 8 8 8 8 8 9 9 9 10 10 11 11 12 13 14 15 16 17 18 19 20 21 22 23 24
86 8 8 9 9 9 9 10 10 10 11 11 12 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
88 9 9 10 10 10 10 11 11 11 12 12 13 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
90 10 10 10 11 11 11 11 12 12 13 13 14 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
92 11 11 11 11 12 12 12 13 13 14 14 15 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
94 12 12 12 12 13 13 13 14 14 15 15 16 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
96 12 13 13 13 14 14 14 15 15 15 16 17 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
98 13 14 14 14 14 15 15 16 16 16 17 18 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
100 14 15 15 15 15 16 16 17 17 17 18 19 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
102 15 15 16 16 16 17 17 17 18 18 19 20 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
104 16 16 17 17 17 18 18 18 19 19 20 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
106 17 17 18 18 18 19 19 19 20 20 21 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
108 18 18 18 19 19 19 20 20 21 21 22 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
110 19 19 19 20 20 20 21 21 22 22 23 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
112 20 20 20 21 21 21 22 22 23 23 24 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
114 21 21 21 22 22 22 23 23 24 24 25 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
116 21 22 22 22 23 23 24 24 25 25 26 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
118 22 23 23 23 24 24 25 25 26 26 27 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Statewide IPM Program, Agriculture and Natural Resources, University of California
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