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The UVM Apple Team

Dr. Lorraine Berkett, 

Terence Bradshaw,  Sarah Kingsley-Richards, Morgan Cromwell

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The UVM Apple Program:

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

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Vermont Apple IPM Focus

  L.P.Berkett, IPM Specialist


2008 Degree Day Accumulation for Arthropod Pests

2008  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

4/01 5 7 3 8
4/12 14 21 12 19
4/19 44 56 41 56
4/26 114 129 109 122
5/02 127 142 125 129
5/10 166 182 161 173
5/17 219 231 214 217
5/25 257 265 250 257
5/31 312 324 305 328
6/08 431 445 421 446
6/14 557 572 547 577
6/21 656 665 644 670
6/28 777 782 767 793
7/05 905 908 897 933
7/12 1055 1057 1046 1088
7/19 1202 1203 1192 1243
7/26 1337 1340 1328 1389
8/02 1480 1479 1470 1538
8/09 1601 1600 1590 1662
8/16 1705 1699 1694 1770
8/23 1815 1804 1806 1877
8/30 1925 1908 1917 1985
9/06 2064 2046 2058 2123
9/13 2141 2122 2133 2205
9/20 2215 2198 2204 2279
9/27 2272 2256 2264 2336
10/04 2324 2311 2314 2396
10/11 2354 2339 2342 2429
10/18 2388 2372 2374 2467
10/25 2392 2376 2378 2473
10/31 2400 2382 2386 2482

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

2007 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 Source of Estimated DD (Base 50F) for arthropod pest events: 2007 Pest Management Guidelines for  Commercial Tree-Fruit Production.  A Cornell Cooperative Extension Publication, Table 14: "Degree-day accumulations (from January 1) corresponding to selected fruit phenology and arthropod pest events."  http://www.nysaes.cornell.edu/ent/treefruit/


Please send comments and suggestions tolorraine.berkett@uvm.edu

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