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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

2003 Degree Day Accumulation for Arthropod Pests

2003  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

 19

22

14

19

25

4/06

19

22

14

19

25

4/12

22

25

17

21

29

4/19

40

47

33

45

58

4/26

61

69

52

64

78

5/03

96

107

82

102

126

5/10

132

140

117

127

160

5/17

167

173

153

149

186

5/25

241

242

228

196

241

6/01

300

299

287

242

297

6/07

355

354

344

287

350

6/14

445

449

431

371

442

6/21

536

541

522

449

532

6/28

708

702

695

591

690

7/05

866

852

855

726

840

7/12

1000

983

989

852

978

7/19

1131

1105

1121

962

 1101

7/26

1271

1245

1258

1093

1244

8/03

1423

1394

1411

1236

1402

8/10

1576

1541

1560

1373

1547

8/16

1751

1711

1735

1532

1719

8/23

1892

1852

1878

1665

1865

8/31

1985

1949

1971

1761

1972

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

2003 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 32-116
Rosy Apple Aphid 56-116

Spotted Tentiform Leafminer (STLM) - 1st adult catch

38-114
STLM - 1st egg observed

58-130
Tight Cluster (McIntosh) 91-123

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 77-205
STLM - 1st generation adult peak flight 110-212
Full Bloom (McIntosh) 170-218
San Jose Scale (SJS) - 1st adult catch 181-321

CM - 1st adult catch

186-324

STLM -1st sap-feeding mines observed

165-317
Petal Fall (McIntosh) 228-282

Plum Curculio (PC) - 1st oviposition scars observed

249-323

OBLR - 1st adult catch, 1st summer brood

478-606

STLM - 2nd gen. 1st adult catch

558-742
SJS - 1st crawlers observed 619-757

OBLR - peak catch

569-837

AMF - 1st capture

746-1032
OFM - 2nd gen. 1st adult catch 799-1025
RBLR - 2nd gen. peak catch 781-1087

STLM - 2nd gen. peak catch

861-1225
RBLR - 2nd gen. peak catch 968-1378

OBLR - 1st catch, 2nd summer brood

1539-1847

STLM - 3rd gen. peak catch

1800-2138

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

Pest Management Guidelines for   Commercial Tree-Fruit Production 2003.  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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