Alliums Carrot Insects Leafy Vegetables Pest Management

Degree days for root, bulb and leafy vegetable pests

Marion Paibomesai, Vegetable Crop Specialist, OMAFRA

Here are the degree days accumulated from April 1st until May 12th-15th, 2011.

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

As of(2011)

Bradford/ Holland Marsh*

238.4

N/A

282.2

20/05

Sarnia

285.3

210.5

329.9

24/05

London

322

240.9

367.1

24/05

Wellington

237.6

165.5

277.4

23/05

Windsor

370.7

279.2

420.7

24/05

Area

Carrot Weevil

Tarnished Plant Bug

Leaf-hopper

GDD

As of(2011)

Bradford/ Holland Marsh*

131.9

30.5

77.4

198.1

20/05

Sarnia

179.3

65.2

124.9

245.8

24/05

London

203.6

68.9

138.1

280.2

24/05

Wellington

132.6

33.1

80.2

200.3

23/05

Windsor

240.8

94.2

173.7

322.4

24/05

* Data provided thanks to Muck Crops Research Station, Department of Plant Agriculture, University of Guelph

Degree Days

1st Generation

2nd Generation

3rd Generation

Onion Maggot

210

1025

1772

Cabbage Maggot

314-398

847-960

1446-1604

Carrot Rust Fly

329-395

1399-1711

n/a

Carrot Weevil

138-156
455 (90% oviposition)

No model available

n/a

Tarnished Plant Bug

40

n/a

n/a

Aster Leafhopper

128

390

n/a

Degree day information for pests:

Enough degree days have accumulated indicating the emergence of 1st generation adults of onion maggot in all regions. Also, enough degree days have accumulated indicating, egg-laying for carrot weevil, emergence of carrot rust fly, and the appearance of tarnished plant bug nymphs in Sarnia, London and Windsor areas. In London and Windsor areas, degree day accumulations indicate hatching of overwintering aster leafhopper.

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