Degree days for root, bulb and leafy vegetable pests – 30 August 2011

For the Wellington area, according to the degree day accumulations expect 3rd generation adult emergence of onion maggot in 5-6 days and emergence of 3rd generation cabbage maggot adults in the next day or so.

Here are the degree days accumulated from April 1st until August 30th, 2011.

Area

Onion Maggot(base 4)

Cabbage Maggot(base 6)

Carrot Rust Fly (base 3)

Carrot Weevil (base 7)

Bradford/Holland Marsh*

1895.5

N/A

2041.3

N/A

Sarnia

1922.3

1649.5

2065.9

1519.3

London

1956.4

1677.3

2100.5

1541

Wellington

1711.6

1439.5

1851.4

1306.6

Windsor

2236.6

1947.1

2385.6

1809.7

Area

Tarnished Plant Bug (base 12)

Leafhopper (base 9)

GDD (base 5)

Bradford/Holland Marsh*

871.6

1224.5

1753.2

Sarnia

917.5

1267.3

1783.8

London

911.5

1277.5

1815.6

Wellington

712.8

1054.2

1574.3

Windsor

1169.7

1544.6

2089.3

* 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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