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How to Manage Pests

Degree-days: Reference Tables

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Tomato Fruitworm

Information about how to use this model in tomatoes

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: 55°F      Upper Threshold: 92°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 00000000
50 000000000
52 0000000000
54 00000000000
56 000000000001
58 0011111111123
60 11111111222345
62 222222222334567
64 2222333334456789
66 3333344445567891011
68 4444445556678910111213
70 4455555667789101112131415
72 5556666778891011121314151617
74 6666777888910111213141516171819
76 7777888999101112131415161718192021
78 88888999101011121314151617181920212223
80 8999910101011111213141516171819202122232425
82 991010101111111212131415161718192021222324252627
84 1010111111121212131314151617181920212223242526272829
86 111111121212131314141516171819202122232425262728293031
88 12121213131314141515161718192021222324252627282930313233
90 1313131414141515161617181920212223242526272829303132333435
92 1414141515151616171718192021222324252627282930313233343536
94 1415151516161717181819202122232425262728293031323334353536
96 1515161616171718181920202122232425262728293031323334353636
98 1616161717171818191920212223242526272829303132323334353637
100 1616171717181819192021222223242526272829303132333434353637
102 1617171718181919202021222324252627282929303132333435353637
104 1717181818191920202122222324252627282930313132333435353637
106 1718181819192020212122232425262627282930313233333435363637
108 1818181919192020212222232425262728292930313233333435363637
110 1818191919202021212223232425262728293030313233343435363637
112 1819191920202121222223242526262728293031313233343435363637
114 1919192020202121222223242526272728293031323233343535363637
116 1919202020212122222323242526272829293031323333343535363637
118 1920202021212122222324252526272829303031323333343535363637

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