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How to Manage Pests

Degree-days: Reference Tables

Omnivorous Leafroller

Information about how to use this model in apples, grapes, nectarines, peaches, or plums

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: 48.0°F      Upper Threshold: 87.0°F      Method: Single Sine      Cutoff: Horizontal
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 1 1 1 2
52 1 1 1 1 1 1 2 2 3 4
54 1 2 2 2 2 2 2 3 4 5 6
56 2 2 2 3 3 3 3 4 5 6 7 8
58 3 3 3 3 4 4 4 5 6 7 8 9 10
60 4 4 4 4 5 5 5 6 7 8 9 10 11 12
62 4 5 5 5 5 6 6 7 8 9 10 11 12 13 14
64 5 6 6 6 6 7 7 8 9 10 11 12 13 14 15 16
66 6 6 7 7 7 8 8 9 10 11 12 13 14 15 16 17 18
68 7 7 8 8 8 9 9 10 11 12 13 14 15 16 17 18 19 20
70 8 8 8 9 9 10 10 11 12 13 14 15 16 17 18 19 20 21 22
72 9 9 9 10 10 11 11 12 13 14 15 16 17 18 19 20 21 22 23 24
74 10 10 10 11 11 12 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
76 11 11 11 12 12 13 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
78 11 12 12 13 13 14 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
80 12 13 13 14 14 15 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
82 13 14 14 15 15 16 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
84 14 15 15 15 16 17 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
86 15 16 16 16 17 18 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
88 16 16 17 17 18 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 39
90 17 17 18 18 19 19 20 21 22 23 24 25 26 27 28 29 30 31 31 32 33 34 35 36 37 38 39 39 39
92 17 18 18 19 19 20 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 37 38 39 39 39
94 18 18 19 19 20 20 21 22 23 24 25 26 27 28 29 30 30 31 32 33 34 35 36 37 38 38 39 39 39
96 18 19 19 20 20 21 22 22 23 24 25 26 27 28 29 30 31 32 33 34 34 35 36 37 38 38 39 39 39
98 19 19 20 20 21 21 22 23 24 25 26 27 27 28 29 30 31 32 33 34 35 35 36 37 38 38 39 39 39
100 19 20 20 21 21 22 22 23 24 25 26 27 28 29 30 31 31 32 33 34 35 36 36 37 38 38 39 39 39
102 20 20 21 21 22 22 23 24 24 25 26 27 28 29 30 31 32 33 33 34 35 36 37 37 38 38 39 39 39
104 20 20 21 21 22 22 23 24 25 26 27 28 28 29 30 31 32 33 34 34 35 36 37 37 38 38 39 39 39
106 20 21 21 22 22 23 23 24 25 26 27 28 29 30 30 31 32 33 34 35 35 36 37 37 38 39 39 39 39
108 21 21 22 22 23 23 24 25 25 26 27 28 29 30 31 31 32 33 34 35 35 36 37 37 38 39 39 39 39
110 21 21 22 22 23 23 24 25 26 27 27 28 29 30 31 32 32 33 34 35 36 36 37 38 38 39 39 39 39
112 21 22 22 23 23 24 24 25 26 27 28 29 29 30 31 32 33 33 34 35 36 36 37 38 38 39 39 39 39
114 22 22 22 23 23 24 25 25 26 27 28 29 30 30 31 32 33 34 34 35 36 36 37 38 38 39 39 39 39
116 22 22 23 23 24 24 25 26 26 27 28 29 30 31 31 32 33 34 34 35 36 36 37 38 38 39 39 39 39
118 22 23 23 23 24 24 25 26 27 27 28 29 30 31 32 32 33 34 35 35 36 37 37 38 38 39 39 39 39

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

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