2010 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

2010 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
4/04	52	58	47	56	44
4/10	82	93	74	100	78
4/17	93	107	84	117	89
4/24	115	132	105	144	106
5/01	140	157	127	175	127
5/08	214	235	197	261	198
5/15	236	257	218	285	216
5/22	308	330	291	354	276
6/01	492	511	475	539	439
6/08	585	612	566	656	537
6/15	656	680	640	733	595
6/22	770	795	758	856	696
6/29	901	930	887	1007	825
7/06	1034	1058	1023	1142	940
7/14	1255	1279	1245	1365	1142
7/24	1486	1512	1473	1605	1357
7/31	1607	1634	1595	1744	1471
8/07	1750	1778	1733	1893	1601
8/14	1893	1926	1873	2047	1737
8/18	1974	2005	1954	2129	1809
8/31	2186	2217	2168	2353	1999
9/04	2291	2270	2321	2460	2093
9/11	2378	2354	2406	2553	2168
9/18	2426	2402	2455	2611	2207
9/25	2498	2531	2470	2703	2277
10/02	2571	2615	2543	2800	2353
10/09	2601	2641	2566	2825	2371
10/16	2616	2657	2581	2846	2383
10/23	2621	2663	2586	2854	2387

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

2010 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 ^{2010 New England Tree Fruit Management Guide}