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The UVM Apple Team

Dr. Lorraine Berkett, Dr. Elena Garcia, 

Terence Bradshaw, Chris Benedict

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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

2002 Degree Day Accumulation for Arthropod Pests

2002  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

Bennington

Bennington Co.

Elev. 370 M

Dummerston

Windham Co.

Elev. 171 M

4/01

 12

13

7

13

 19

4/07

 12

13

7

13

 22

4/13

 32

35

24

32

 46

4/17

 84

89

73

85

 100

4/20

 126

137

112

132

 148

4/22

 126

138

112

133

 150

4/27

 130

141

116

135

 153

4/30

 130

141

116

135

 154

5/5

132

143

118

137

 159

5/11

 179

191

163

182

 213

5/18

192

207

175

198

 235

5/26

 231

245

210

231

 277

6/1

 333

342

309

322

 377

6/8

401

412

373

384

443

6/15

 477

498

447

465

 526

6/22

 574

593

545

547

 618

6/29

 712

731

684

680

 763

7/6

887

901

865

839

937

7/13

1000

1009

979

939

1052

7/20

1123

1138

1100

1073

1191

7/27

1248

1265

1226

1192

1321

8/3

1420

1436

1401

1353

1493

8/10

1546

1560

1528

1469

1622

8/17

 1739

1751

1721

1650

1819

8/24

1863

1874

1842

1768

1951

8/31

1957

1964

1937

1849

2045

9/7

2061

2064

2046

1929

2136

9/14

2188

2188

2175

2034

2255

9/21

2292

2294

2280

2134

2367

9/28

2357

2358

2346

2196

2440

10/5

2421

2424

2406

2258

2512

10/12

2450

2455

2435

2279

2542

10/19

2458

2463

2442

2282

2548

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

2002 Guide to Arthropod Pest Events Based on Degree-Day Accumulations1
Pest/Phenology Event

Estimated DD Base 50 F for Event
Redbanded leafroller (RBLR) - 1st catch 31-127
Rosy Apple Aphid 56-116

Spotted Tentiform Feafminer (STLM) - 1st adult catch

38-116
STLM - 1st egg observed

58-130
Tight Cluster (McIntosh) 90-120

Tarnished Plant Bug (TPB) - 1st observed

43-171
Obliquebanded leafroller (OBLR) - 1st overwintered larvae observed 64-160

European Red Mite (ERM) - egg hatch observed

100-168
Pink (McIntosh) 124-152
Oriental Fruit Moth (OFM) - 1st adult catch 75-205
STLM - 1st generation adult peak flight 112-214
Full Bloom (McIntosh) 169-219
San Jose Scale (SJS) - 1st adult catch 181-321

CM - 1st adult catch

185-325

STLM -1st sap-feeding mines observed

165-317
Petal Fall (McIntosh) 229-283

Plum Curculio (PC) - 1st oviposition scars observed

249-323

OBLR - 1st adult catch, 1st summer brood

479-607

STLM - 2nd gen. 1st adult catch

554-740
SJS - 1st crawlers observed 619-757

OBLR - peak catch

567-839

AMF - 1st capture

742-1026
OFM - 2nd gen. 1st adult catch 806-1030
RBLR - 2nd gen. peak catch 787-1093

STLM - 2nd gen. peak catch

860-1230
RBLR - 2nd gen. peak catch 966-1388

OBLR - 1st catch, 2nd summer brood

1556-1850

STLM - 3rd gen. peak catch

1832-2146

1 Source of Estimated DD (Base 50F) for arthropod pest events:

Pest Management Guidelines for   Commercial Tree-Fruit Production 2002 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 to:  lorraine.berkett@uvm.edu

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