Degree days for root, bulb and leafy vegetable pests – 4 July 2011

In the Windsor area, accumulated degree days indicate emergence of the 2nd generation of onion maggot and cabbage maggot. Local emergence of aster leafhopper adults is expected in the Wellington area.

Here are the degree days accumulated from April 1st until July 4th, 2011.

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

Carrot Weevil

Bradford/Holland Marsh*

906.2

N/A

995.9

661.7

Sarnia

883

724.2

969.6

651

London

930.8

765.7

1017.9

686.4

Wellington

779.3

621.2

862.1

545.3

Windsor

1081.9

906.4

1173.9

826

Area

Tarnished Plant Bug

Leafhopper

GDD

Bradford/Holland Marsh*

330.2

515.1

819.9

Sarnia

334.2

513

801.5

London

341.9

536.9

847

Wellington

236.5

406.9

699

Windsor

471

674.9

991.6

* 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

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s