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 |
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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