The UVM Apple Team

Roger Brouillette, Gwen Neff, Jessica Reardon, Linda Boccuzzo, Dr. Elena Garcia, and Dr. Lorraine Berkett

The UVM Apple Program:

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

1999  Estimated Degree-Day Accumulation (Base 50F, from Jan. 1) for Selected Sites

Date

UVM Hort.Res.Center

Shoreham

New Haven

Walpole, NH

4/07

22

29

22

18

27

4/14

34

26

23

34

4/17

39

30

26

39

4/18

30

41

32

27

41

4/24

54

44

33

52

4/27

49

62

51

40

60

5/1

83

69

56

77

5/4

104

117

103

78

101

5/8

179

163

118

144

5/11

196

179

133

163

5/15

219

199

153

186

5/18

258

238

178

215

5/23

317

293

222

267

5/31

412

383

294

351

6/7

555

519

412

479

6/13

675

634

514

580

7/20

1414

1349

1166

1301

8/11

1844

1760

1578

1741

1999 Guide to Arthropod Pest Events Based on Degree-Day Accumulations¹

Estimated DD Base 50 F for Event

STLM - 1st adult catch

38-116

TPB - 1st observed

43-171

ERM - egg hatch observed

100-168

STLM - 1st gen. adult peak flight

108-216

CM - 1st adult catch

182-322

STLM -1st sap-feeding mines observed

187-323

PC - 1st oviposition scars observed

249-323

OBLR - 1st adult catch, 1st summer brood

484-612

STLM - 2nd gen. 1st adult catch

558-750

OBLR - peak catch

584-850

AMF - 1st capture

741-993

STLM - 2nd gen. peak catch

OBLR - 1st catch, 2nd summer brood

1568-1866

STLM - 3rd gen. peak catch

1822-2152

1 Source of Estimated DD (Base 50F) for arthropod pest events: 1999 Pest

Management Recommendations for Commercial Tree-Fruit Production,

Cornell Coop.Ext. Pub., Table 15., Degree-Day Accumulations are from January 1