Degree days for root, bulb and leafy vegetable pests – 18 July 2011

The Windsor area has reached the degree day threshold for emergence of the 2nd generation of carrot rust fly. The Wellington area will reach the thresholds for emergence of 2nd generation of onion maggot and cabbage maggot in the next couple days.

Here are the degree days accumulated from April 1st until July 18th, 2011.

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

Carrot Weevil

Bradford/Holland Marsh*

1165.0

N/A

1268.8

N/A

Sarnia

1141.9

955.1

1242.5

867.9

London

1192.3

999.2

1293.4

905.9

Wellington

1018

831.9

1114.8

742

Windsor

1375.4

1171.9

1481.4

1077.5

Area

Tarnished Plant Bug

Leafhopper

GDD

Bradford/Holland Marsh*

477.1

703.9

1064.7

Sarnia

481.1

701.9

1046.4

London

491.4

728.4

1094.5

Wellington

363.2

575.6

923.7

Windsor

652.5

898.4

1271.1

* 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

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