The Wellington area has reached the degree day thresholds for the emergence of 2nd generation onion maggot and cabbage maggot. In the Windsor area, degree day accumulations will reach the threshold indicating emergence of 3rd generation of cabbage maggot in the next 5-6 days. Bradford/Holland Marsh, Sarnia, London and Windsor areas have reached the threshold indicating emergence of the 2nd generation of carrot rust fly.
Here are the degree days accumulated from April 1st until July 25th, 2011.
| Area |
Onion Maggot(base 4) |
Cabbage Maggot(base 6) |
Carrot Rust Fly (base 3) |
Carrot Weevil (base 7) |
| Bradford/Holland Marsh* |
1314.7 |
N/A |
1425.5 |
N/A |
| Sarnia |
1294.5 |
1093.7 |
1402.1 |
999.5 |
| London |
1345.7 |
1138.6 |
1453.8 |
1038.3 |
| Wellington |
1156.3 |
956.2 |
1260.1 |
859.3 |
| Windsor |
1545 |
1327.5 |
1658 |
1226.1 |
| Area |
Tarnished Plant Bug (base 12) |
Leafhopper (base 9) |
GDD (base 5) |
| Bradford/Holland Marsh* |
570.7 |
818.7 |
1207.4 |
| Sarnia |
577.7 |
819.5 |
1192 |
| London |
588.8 |
846.8 |
1240.9 |
| Wellington |
445.5 |
678.9 |
1055 |
| Windsor |
766.1 |
1033 |
1433.7 |
* 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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