Degree day accumulations indicate: emergence of the 3rd generation of onion maggot in the Sarnia area and the peak emergence of 3rd generation cabbage maggot in Sarnia and London.
Here are the degree days accumulated from April 1st until August 22nd, 2011.
| Area |
Onion Maggot(base 4) |
Cabbage Maggot(base 6) |
Carrot Rust Fly (base 3) |
Carrot Weevil (base 7) |
| Bradford/Holland Marsh* |
1787.4 |
N/A |
1926.2 |
N/A |
| Sarnia |
1795.9 |
1539.1 |
1931.5 |
1416.9 |
| London |
1835.7 |
1572.6 |
1971.8 |
1444.3 |
| Wellington |
1601.7 |
1345.6 |
1733.5 |
1220.7 |
| Windsor |
2097.8 |
1824.3 |
2238.8 |
1694.9 |
| Area |
Tarnished Plant Bug (base 12) |
Leafhopper (base 9) |
GDD (base 5) |
| Bradford/Holland Marsh* |
819.5 |
1151.4 |
1652.1 |
| Sarnia |
855.1 |
1180.9 |
1665.4 |
| London |
854.8 |
1196.8 |
1702.9 |
| Wellington |
666.9 |
984.3 |
1472.4 |
| Windsor |
1094.9 |
1445.8 |
1958.5 |
* 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 |
n/a |
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