Degree days for root, bulb and leafy vegetable pests – 15 August 2011

In Sarnia, the 3rd generation of cabbage maggot are expected to emerge in next day or so. In the London area, accumulated degree days have reached the threshold indicating the emergence of the 3rd generation of cabbage maggot. Also, in the London area, expect the  3rd generation of onion maggot to emerge in about 3-4 days.

Here are the degree days accumulated from April 1st until August 15th, 2011.

Area

Onion Maggot(base 4)

Cabbage Maggot(base 6)

Carrot Rust Fly (base 3)

Carrot Weevil (base 7)

Bradford/Holland Marsh*

1676.5

N/A

1808.3

N/A

Sarnia

1678.6

1435.8

1807.2

1320.6

London

1723.8

1474.7

1852.9

1353.4

Wellington

1499.5

1257.4

1624.3

1139.5

Windsor

1969.5

1710

2103.5

1587.6

Area

Tarnished Plant Bug (base 12)

Leafhopper (base 9)

GDD (base 5)

Bradford/Holland Marsh*

764.6

1075.5

1548.2

Sarnia

793.8

1098.6

1555.1

London

798.9

1119.9

1598

Wellington

620.7

917.1

1377.2

Windsor

1022.6

1352.5

1837.2

* 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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