Alliums Brassica Vegetables Carrot Insects Leafy Vegetables Pest Management

Degree days for root, bulb and leafy vegetable pests – 7 June 2011

In all areas, accumulated degree days have indicated emergence of onion maggot adults and carrot rust fly adults, appearance of tarnished plant bug nymphs and ovipostion in carrot weevil. First generation cabbage maggot adults have been emerging in all areas except Wellington; however, expect to accumulate enough degree days over the next day or so in this area indicating emergence. In the Windsor area, accumulations are approaching 90% oviposition for carrot weevil. In all areas, overwintering eggs for aster leafhopper will be hatching and expect the beginning of emergence of local adults in the Windsor area over the next few days.

Here are the degree days accumulated from April 1st until June 7th, 2011.

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

Carrot Weevil

As of

Bradford/HollandMarsh*

481.6

N/A

543.3

321.1

07/06/2011

Sarnia

455

352.2

513.6

307

07/06/2011

London

507.4

398.3

566.5

347

07/06/2011

Wellington

411.3

309.2

466.1

261.3

07/06/2011

Windsor

587.1

467.6

651.1

415.2

07/06/2011

Area

Tarnished Plant Bug

Leafhopper

GDD

As of

Bradford/HollandMarsh*

129.6

230.5

423.3

07/06/2011

Sarnia

130.2

225

401.5

07/06/2011

London

142.5

253.5

451.6

07/06/2011

Wellington

92

178.9

359

07/06/2011

Windsor

200.2

320.1

524.8

07/06/2011

* 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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