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How to Manage Pests

Degree-days: Reference Tables

| DD menu | About degree-days | Other 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
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	1
54	1	1	1	1	1	1	1	1	1	2	3
56	1	1	1	1	1	1	2	2	2	3	4	5
58	2	2	2	2	2	2	2	3	3	4	5	6	7
60	2	2	3	3	3	3	3	4	4	5	6	7	8	9
62	3	3	3	4	4	4	4	5	5	6	7	8	9	10	11
64	4	4	4	4	5	5	5	6	6	7	8	9	10	11	12	13
66	5	5	5	5	5	6	6	7	7	8	9	10	11	12	13	14	15
68	5	6	6	6	6	7	7	8	8	9	10	11	12	13	14	15	16	17
70	6	6	7	7	7	8	8	8	9	10	11	12	13	14	15	16	17	18	19
72	7	7	8	8	8	9	9	9	10	11	12	13	14	15	16	17	18	19	20	21
74	8	8	8	9	9	9	10	10	11	12	13	14	15	16	17	18	19	20	21	22	23
76	9	9	9	10	10	10	11	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25
78	10	10	10	11	11	11	12	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27
80	11	11	11	12	12	12	13	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29
82	11	12	12	12	13	13	14	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
84	12	13	13	13	14	14	15	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33
86	13	14	14	14	15	15	16	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35
88	14	15	15	15	16	16	17	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37
90	15	15	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
92	16	16	17	17	17	18	19	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	37	38	39
94	17	17	17	18	18	19	19	20	21	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	38	39
96	17	17	18	18	19	19	20	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	34	35	36	37	38	39	39
98	18	18	18	19	19	20	20	21	22	23	24	24	25	26	27	28	29	30	31	32	33	34	35	36	36	37	38	39	39
100	18	18	19	19	20	20	21	21	22	23	24	25	26	27	28	29	30	31	31	32	33	34	35	36	37	37	38	39	39
102	19	19	19	20	20	21	21	22	23	23	24	25	26	27	28	29	30	31	32	33	33	34	35	36	37	37	38	39	39
104	19	19	20	20	21	21	22	22	23	24	25	26	27	28	28	29	30	31	32	33	34	35	35	36	37	38	38	39	39
106	19	20	20	21	21	21	22	23	23	24	25	26	27	28	29	30	31	31	32	33	34	35	35	36	37	38	38	39	39
108	20	20	20	21	21	22	22	23	24	25	25	26	27	28	29	30	31	32	32	33	34	35	36	36	37	38	38	39	39
110	20	20	21	21	22	22	23	23	24	25	26	27	28	28	29	30	31	32	33	33	34	35	36	36	37	38	38	39	39
112	20	21	21	22	22	22	23	24	24	25	26	27	28	29	29	30	31	32	33	34	34	35	36	37	37	38	38	39	39
114	21	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	38	39	39
116	21	21	22	22	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
118	21	22	22	22	23	23	24	24	25	26	27	28	28	29	30	31	32	32	33	34	35	35	36	37	37	38	38	39	39

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