Degree days for root, bulb and leafy vegetable pests – 27 June 2012

Thresholds for second generation emergence of onion maggot flies and cabbage maggot flies have been reached in the Windsor area. The threshold for emergence of local adult leafhoppers has been reached in all areas.

No new leek moth captures this week in Southwestern Ontario, while second flight of leek moth is underway in Quebec. Registered insecticides can be applied 7-10 days after peak flight according to pheromone traps, in order to target larva.

Here are the degree days accumulated from April 1st until June 27th, 2012.

(These values are provided as guidelines only. Local environments, soil type, field history, etc. may influence activity of these pests.)

Area

Onion Maggot

Cabbage Maggot

Carrot Rust Fly

Carrot Weevil

As of

Bradford/Holland Marsh*

832.6

n/a

915.2

626.5

26/06/2012

London

878.5

718

964.3

647.8

27/06/2012

Wellington

760.6

621.1

838.1

557.8

27/06/2012

Windsor

916.9

761

996.8

686.8

27/06/2012

Thedford

870.7

716.2

955.3

644.7

27/06/2012

Delhi

851.5

697.7

937.6

631.4

27/06/2012

Ridgetown

Data not updated since 28 May 2012

 

Area

Tarnished Plant Bug

Leafhopper

GDD

As of

Bradford/Holland Marsh*

334.0

503.7

759.9

26/06/2012

London

343.8

521.2

796.2

27/06/2012

Wellington

266.8

436.5

688.1

27/06/2012

Windsor

376.5

551

838.1

27/06/2012

Thedford

339

516.2

791

27/06/2012

Delhi

330.6

506.8

770.5

27/06/2012

Ridgetown

Data not updated since 28 May 2012


Degree day model 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


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