Degree days for root, bulb and leafy vegetable pests – 22 August 2011

Degree day accumulations indicate: emergence of the 3rd generation of onion maggot in the Sarnia area and the peak emergence of 3rd generation cabbage maggot in Sarnia and London.

Here are the degree days accumulated from April 1st until August 22nd, 2011.

Area

Onion Maggot(base 4)

Cabbage Maggot(base 6)

Carrot Rust Fly (base 3)

Carrot Weevil (base 7)

Bradford/Holland Marsh*

1787.4

N/A

1926.2

N/A

Sarnia

1795.9

1539.1

1931.5

1416.9

London

1835.7

1572.6

1971.8

1444.3

Wellington

1601.7

1345.6

1733.5

1220.7

Windsor

2097.8

1824.3

2238.8

1694.9

Area

Tarnished Plant Bug (base 12)

Leafhopper (base 9)

GDD (base 5)

Bradford/Holland Marsh*

819.5

1151.4

1652.1

Sarnia

855.1

1180.9

1665.4

London

854.8

1196.8

1702.9

Wellington

666.9

984.3

1472.4

Windsor

1094.9

1445.8

1958.5

* 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 (overwintering egg hatch)

390 (local adult emergence)

n/a

n/a

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