Degree days have accumulated past the threshold indicating 90% oviposition of carrot weevil in Sarnia, Bradford/Holland Marsh and London areas. Local emergence of aster leafhopper adults is expected in the London area and in the Bradford/Holland Marsh in the next few days.
Here are the degree days accumulated from April 1st until June 20th, 2011.
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
| Bradford/Holland Marsh* |
686.2 |
N/A |
761.9 |
483.7 |
| Sarnia |
655 |
524.2 |
727.6 |
465 |
| London |
713.5 |
576.4 |
786.6 |
511.1 |
| Wellington |
589.2 |
459.1 |
658 |
397.2 |
| Windsor |
822.3 |
674.8 |
900.3 |
608.4 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
| Bradford/Holland Marsh* |
222.2 |
365.1 |
613.9 |
| Sarnia |
218.2 |
355 |
587.5 |
| London |
236.6 |
389.6 |
643.7 |
| Wellington |
158.4 |
286.8 |
522.9 |
| Windsor |
323.4 |
485.3 |
746 |
* 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 |
No model available |
n/a |
| Tarnished Plant Bug |
40 |
n/a |
n/a |
| Aster Leafhopper |
128 |
390 |
n/a |
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