Degree days for root, bulb and leafy vegetable pests – 27 June 2011

In the Windsor area, emergence of the 2nd generation of onion maggot and cabbage maggot is expected soon (maybe 5-7 days) according to the accumulating degree days. Degree days have accumulated past the threshold indicating 90% oviposition of carrot weevil in the Wellington area. Local emergence of aster leafhopper adults is expected in the Wellington area in the next few days.

Here are the degree days accumulated from April 1st until June 27th, 2011.

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

Carrot Weevil

Bradford/Holland Marsh*

795.4

N/A

878.2

571.9

Sarnia

766.5

621.7

846.1

555.5

London

819.4

668.3

899.5

596

Wellington

684.1

540

759.9

471.1

Windsor

945.3

783.8

1030.3

710.4

Area

Tarnished Plant Bug

Leafhopper

GDD

Bradford/Holland Marsh*

275.5

439.4

716.1

Sarnia

273.7

431.5

692

London

286.5

460.5

742.6

Wellington

197.3

346.7

610.8

Windsor

390.4

573.3

862

* 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

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