2009 DD Accumulation for Arthropod Pests

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The UVM Apple Team

Dr. Lorraine Berkett,

Terence Bradshaw, Sarah Kingsley-Richards, Morgan Cromwell

The UVM Apple Program:

Extension and Research for the commercial tree fruit grower in Vermont and beyond...

Vermont Apple IPM Focus

2009 Estimated Degree-Day Accumulation (Base 50F, from Jan. 1) for Selected Sites
Date	UVM HRC South Burlington Chittenden Co. Elev. 71 M	Shoreham Addison Co. Elev. 107 M	South Hero Grand Isle Co. Elev. 54M	Dummerston Windham Co. Elev. 171 M	East Dorset Bennington Co. Elev. 408 M
4/01	8	10	5	13	7
4/04	15	17	13	20	13
4/11	15	19	13	24	15
4/18	24	32	23	38	25
4/25	51	59	49	63	44
5/02	122	134	117	148	114
5/09	171	183	165	197	151
5/16	211	228	206	247	187
5/24	282	307	274	335	260
5/31	320	348	313	378	292
6/06	370	400	359	437	337
6/13	449	481	436	525	411
6/20	545	571	534	609	484
6/27	687	709	678	804	601
7/04	809	829	802	849	702
7/11	909	925	904	944	784
7/18	1015	1034	1011	1057	880
7/25	1142	1160	1138	1178	988
8/02	1316	1330	1312	1354	1142
8/09	1424	1436	1423	1468	1233
8/16	1587	1594	1588	1622	1372
8/22	1735	1743	1736	1786	1514
8/30	1855	1862	1853	1921	1623
9/07	1949	1954	1945	2016	1703
9/13	2020	2020	2016	2075	1752
9/19	2063	2065	2057	2125	1790
9/26	2130	2132	2125	2194	1845
10/02	2155	2157	2149	2223	1864
10/09	2183	2187	2176	2262	1885
10/16	2185	2187	2176	2262	1885
10/23	2192	2197	2180	2277	1895
10/31	2202	2211	2189	2291	1903

Degree Day and other weather information received from Skybit E-Weather Service: http://www.skybit.com/

2009 Guide to Arthropod Pest Events Based on Degree-Day Accumulations¹
Pest/Phenology Event	^{Estimated DD Base 50 F (Jan 1)}

Redbanded Leafroller (RBLR) - 1st catch	32-124
Rosy Apple Aphid	56-116
^{Spotted Tentiform Leafminer (STLM) - 1st adult catch}	^39-113
STLM - 1st egg observed	58-130
^{Tight Cluster (McIntosh)}	^84-122
Tarnished Plant Bug (TPB) - 1st observed	^43-167
^{Obliquebanded leafroller (OBLR) - 1st overwintered larvae observed}	^64-160
European Red Mite (ERM) - egg hatch observed	100-168
^{Pink (McIntosh)}	^125-157
^{Oriental Fruit Moth (OFM) - 1st adult catch}	^81-205
^{STLM - 1st generation adult peak flight}	^113-209
^{Full Bloom (McIntosh)}	^170-220
^{San Jose Scale (SJS) - 1st adult catch}	^186-324
CM - 1st adult catch	^190-330
STLM -1st sap-feeding mines observed	165-317
^{Petal Fall (McIntosh)}	^227-283
Plum Curculio (PC) - 1st oviposition scars observed	249-323
OBLR - 1st adult catch, 1st summer brood	^479-605
STLM - 2nd gen. 1st adult catch	^560-740
SJS - 1st crawlers observed	619-757
OBLR - peak catch	^565-827
AMF - 1st capture	^750-1034
OFM - 2nd gen. 1st adult catch	784-1020
RBLR - 2nd gen. peak catch	770-1070
STLM - 2nd gen. peak catch	^861-1217
^{RBLR - 2nd gen. peak catch}	^965-1353
OBLR - 1st catch, 2nd summer brood	^1528-1836
STLM - 3rd gen. peak catch	^1775-2121

1 ^{2009 New England Tree Fruit Management Guide}