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How to Manage Pests

Degree-days: Reference Tables

Beet Armyworm

Information about how to use this model in floriculture and ornamental nurseries

With this chart, you must add two half-day values to get total degree-days for one day.

  1. For the first half-day value, look up the value where the minimum and maximum temperatures for the day intersect.
  2. For the second half-day value, find the value at the intersection of the maximum temperature for the day and the minimum temperature for the NEXT day.
  3. Add the two numbers to determine the degree-days for the day. For odd-numbered temperatures, interpolate between numbers.

Lower Threshold: 54.0°F        Method: Single Sine
This is a double method; read two entries for each day and add.
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 1 1
58 0 0 0 0 0 0 1 1 1 1 1 2 2
60 1 1 1 1 1 1 1 1 1 1 2 2 3 3
62 1 1 1 1 1 1 1 1 2 2 2 3 3 4 4
64 1 1 1 1 2 2 2 2 2 2 3 3 4 4 5 5
66 2 2 2 2 2 2 2 2 2 3 3 4 4 5 5 6 6
68 2 2 2 2 2 2 3 3 3 3 4 4 5 5 6 6 7 7
70 2 2 3 3 3 3 3 3 3 4 4 5 5 6 6 7 7 8 8
72 3 3 3 3 3 3 3 4 4 4 5 5 6 6 7 7 8 8 9 9
74 3 3 3 3 4 4 4 4 4 5 5 6 6 7 7 8 8 9 9 10 10
76 4 4 4 4 4 4 4 5 5 5 6 6 7 7 8 8 9 9 10 10 11 11
78 4 4 4 4 5 5 5 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12
80 4 5 5 5 5 5 5 6 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13
82 5 5 5 5 5 6 6 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14
84 5 5 6 6 6 6 6 7 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15
86 6 6 6 6 6 7 7 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16
88 6 6 6 7 7 7 7 8 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17
90 7 7 7 7 7 8 8 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18
92 7 7 7 8 8 8 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19
94 8 8 8 8 8 8 9 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19
96 8 8 8 9 9 9 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20
98 8 9 9 9 9 9 10 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20
100 9 9 9 9 10 10 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21
102 9 10 10 10 10 10 11 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21
104 10 10 10 10 11 11 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22
106 10 10 11 11 11 11 12 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22
108 11 11 11 11 12 12 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23
110 11 11 12 12 12 12 13 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23
112 12 12 12 12 13 13 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24
114 12 12 13 13 13 13 14 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24
116 13 13 13 13 14 14 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25
118 13 13 14 14 14 14 15 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25

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