The Windsor area has reached the degree day threshold for emergence of the 2nd generation of carrot rust fly. The Wellington area will reach the thresholds for emergence of 2nd generation of onion maggot and cabbage maggot in the next couple days.
Here are the degree days accumulated from April 1st until July 18th, 2011.
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
| Bradford/Holland Marsh* |
1165.0 |
N/A |
1268.8 |
N/A |
| Sarnia |
1141.9 |
955.1 |
1242.5 |
867.9 |
| London |
1192.3 |
999.2 |
1293.4 |
905.9 |
| Wellington |
1018 |
831.9 |
1114.8 |
742 |
| Windsor |
1375.4 |
1171.9 |
1481.4 |
1077.5 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
| Bradford/Holland Marsh* |
477.1 |
703.9 |
1064.7 |
| Sarnia |
481.1 |
701.9 |
1046.4 |
| London |
491.4 |
728.4 |
1094.5 |
| Wellington |
363.2 |
575.6 |
923.7 |
| Windsor |
652.5 |
898.4 |
1271.1 |
* 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 (overwintering egg hatch) 390 (local adult emergence) |
n/a |
|
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