Degree days for root, bulb and leafy vegetable pests – 13 June 2011

Enough degree days have accumulated indicating the emergence of cabbage maggot adults in the Wellington area. Also, sufficient degree days will accumulate soon in the Bradford/Holland Marsh and London areas indicating 90% oviposition of carrot weevil. Local emergence of aster leafhopper adults is expected in the Windsor area. Also, expect local aster leafhopper adults to start emerging in the London area over the next few days, especially if it warms up as forecasted.

Here are the degree days accumulated from April 1st until June 13th, 2011.

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

Carrot Weevil

As of

Bradford/HollandMarsh*

584.1

N/A

652.9

402.7

13/06/2011

Sarnia

559

442.2

624.6

390

13/06/2011

London

607.7

484.6

673.8

426.3

13/06/2011

Wellington

496.8

380.7

558.6

325.8

13/06/2011

Windsor

708.2

574.7

779.2

515.3

13/06/2011

Area

Tarnished Plant Bug

Leafhopper

GDD

As of

Bradford/HollandMarsh*

176.2

298.1

518.8

13/06/2011

Sarnia

178.2

294

498.5

13/06/2011

London

186.8

318.8

544.9

13/06/2011

Wellington

122

229.4

437.5

13/06/2011

Windsor

265.3

406.2

638.9

13/06/2011

* 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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