Alliums Brassica Vegetables Carrot Insects Leafy Vegetables Pest Management

Degree days for root, bulb and leafy vegetable pests – 20 June 2011

Degree days have accumulated past the threshold indicating 90% oviposition of carrot weevil in Sarnia, Bradford/Holland Marsh and London areas.  Local emergence of aster leafhopper adults is expected in the London area and in the Bradford/Holland Marsh in the next few days.

Here are the degree days accumulated from April 1st until June 20th, 2011.

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

Carrot Weevil

Bradford/Holland Marsh*

686.2

N/A

761.9

483.7

Sarnia

655

524.2

727.6

465

London

713.5

576.4

786.6

511.1

Wellington

589.2

459.1

658

397.2

Windsor

822.3

674.8

900.3

608.4

Area

Tarnished Plant Bug

Leafhopper

GDD

Bradford/Holland Marsh*

222.2

365.1

613.9

Sarnia

218.2

355

587.5

London

236.6

389.6

643.7

Wellington

158.4

286.8

522.9

Windsor

323.4

485.3

746

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

 Degree day information for pests

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

0 comments on “Degree days for root, bulb and leafy vegetable pests – 20 June 2011

Leave a Reply

%d bloggers like this: