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How to Manage Pests

Degree-days: Reference Tables

San Jose Scale

Information about how to use this model in apples, almonds, cherries, nectarines, peaches, pears, plums, or prunes

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: 51.0°F      Upper Threshold: 90.0°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
4800000000
50000000000
520000000001
5411111111123
56111111222345
582222222334567
6022333334456789
6233344445567891011
6444445556678910111213
6655555667789101112131415
6856666778891011121314151617
7066777888910111213141516171819
7277888999101112131415161718192021
74888999101011121314151617181920212223
7699910101011111213141516171819202122232425
781010101111111212131415161718192021222324252627
80111111121212131314151617181920212223242526272829
8211121212131314141516171819202122232425262728293031
841213131314141515161718192021222324252627282930313233
86131414141515161617181920212223242526272829303132333435
8814151515161617171819202122232425262728293031323334353637
901515161617171818192021222324252627282930313233343536373839
921616171717181919202122232425262728293031323334353637373839
941717171818191920212122232425262728293031323334353637383839
961717181819192020212223242526272829303132333434353637383939
981818181919202021222324242526272829303132333435363637383939
1001818191920202121222324252627282930313132333435363737383939
1021919192020212122232324252627282930313233333435363737383939
1041919202021212222232425262728282930313233343535363738383939
1061920202121212223232425262728293031313233343535363738383939
1082020202121222223242525262728293031323233343536363738383939
1102020212122222323242526272828293031323333343536363738383939
1122021212222222324242526272829293031323334343536373738383939
1142121212222232324252526272829303131323334353536373738383939
1162121222223232424252627272829303132323334353536373738383939
1182122222223232424252627282829303132323334353536373738383939

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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