Degree days for root, bulb and leafy vegetable pests – 19 June 2012

Thresholds for second generation emergence of onion maggot flies and cabbage maggot flies should be reached in 5-7 days in the Windsor area. In all areas, if resident populations are present, carrot weevil have likely completed 90% oviposition. The threshold for emergence of local adult leafhoppers has been reached in Bradford/Holland Marsh, London, Thedford, and Delhi and is expected to be reached in Wellington over the next 2-3 days.

Here are the degree days accumulated from April 1st until June 19th, 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*

701.8

n/a

777.5

516.7

19/06/2012

London

743.9

599.4

821.7

537.2

19/06/2012

Wellington

639.6

516.1

709.1

460.8

19/06/2012

Windsor

916.9

761

996.8

686.8

19/06/2012

Thedford

709.1

572.6

784.7

510.1

19/06/2012

Delhi

695.4

559.6

772.5

502.3

19/06/2012

Ridgetown

Data not updated since 28 May 2012

 

 

Area

Tarnished Plant Bug

Leafhopper

GDD

As of

Bradford/Holland Marsh*

259.2

407.9

636.1

19/06/2012

London

273.2

426.6

669.6

19/06/2012

Wellington

209.8

355.5

575.1

19/06/2012

Windsor

376.5

551

838.1

19/06/2012

Thedford

249.4

399.6

638.4

19/06/2012

Delhi

246.5

395.7

623.4

19/06/2012

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

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