2022 Pear Psylla Degree Day Table | WSU Tree Fruit

Authors: Louis Nottingham, Robert Orpet, WSU Entomology. March 1, 2022

See the Pear Psylla Phenology Model page for conventional and organic guidelines on current and future pear pest management.

2022 Pear Psylla Degree Days (PDD), Updated Weekly

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2022	Cashmere	Omak	Peshastin	Wapato	Wenatchee	Hood River	Medford
28-Feb	57	6	48	92	55	113	313
7-Mar	99	27	78	146	95	161	354
14-Mar	125	48	95	183	123	196	408
20-Mar	160	80	120	220	159	228	447
27-Mar	240	143	188	298	242	308	542
3-Apr	310	208	246	372	321	372	615
10-Apr	353	253	273	419	368	409	681
17-Apr	365	274	281	427	382	424	704
24-Apr	419	324	322	483	442	474	762
1-May	491	391	377	555	523	532	832
8-May	575	483	442	639	620	606	907
15-May	646	552	497	721	705	680	983
22-May	738	647	573	821	812	768	1085
29-May	869	773	678	950	952	887	1215
5-Jun	1006	926	804	1095	1103	1035	1343
12-Jun	1152	1079	931	1258	1266	1173	1506
19-Jun	1282	1215	1042	1390	1418	1290	1613
26-Jun	1463	1397	1204	1570	1624	1465	1798
3-Jul	1668	1605	1387	1788	1845	1649	1983
10-Jul	1853	1793	1552	1990	2049	1830	2183
17-Jul	2084	2017	1757	2213	2295	2035	2407
24-Jul	2316	2243	1971	2437	2544	2242	2616
31-Jul	2573	2506	2221	2692	2811	2494	2875
7-Aug	2793	2724	2422	2900	3050	2710	3113
14-Aug	3031	2970	2645	3128	3302	2904	3324
21-Aug	3285	3226	2887	3371	3559	3110	3549
28-Aug	3515	3449	3103	3588	3803	3306	3767
4-Sep	3741	3663	3317	3800	4037	3489	3984
11-Sep	3917	3842	3479	3969	4229	3641	4200
18-Sep	4072	3998	3623	4119	4392	3770	4355
25-Sep	4228	4148	3763	4264	4562	3893	4518
2-Oct	4397	4313	3923	4426	4742	4030	4685
9-Oct	4560	4481	4082	4588	4907	4168	4869
16-Oct	4696	4613	4210	4720	5047	4282	5029
23-Oct	4782	4683	4295	4804	5137	4359	5139
30-Oct	4837	4738	4338	4866	5196	4410	5199

Pear Psylla Degree Days and Management Timings

Contact:

Dr. Louis Nottingham
Assistant Professor
WSU Tree Fruit Research & Extension Center
1100 N Western Ave., Wenatchee, WA 98801
louis.nottingham@wsu.edu
540-798-2044 (cell)

Dr. Robert Orpet
Postdoctoral Research Associate
WSU Tree Fruit Research & Extension Center
1100 N Western Ave., Wenatchee, WA 98801
robert.orpet@wsu.edu

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Disclaimer:

Use pesticides with care. Apply them only to plants, animals, or sites listed on the labels. When mixing and applying pesticides, follow all label precautions to protect yourself and others around you. It is a violation of the law to disregard label directions. If pesticides are spilled on skin or clothing, remove clothing and wash skin thoroughly. Store pesticides in their original containers and keep them out of the reach of children, pets, and livestock.

YOU ARE REQUIRED BY LAW TO FOLLOW THE LABEL. It is a legal document. Always read the label before using any pesticide. You, the grower, are responsible for safe pesticide use. Trade (brand) names are provided for your reference only. No discrimination is intended, and other pesticides with the same active ingredient may be suitable. No endorsement is implied.