In the Windsor area, degree days have accumulated past the threshold indicating emergence of the 3rd generation of cabbage maggot. Also in the Windsor area, emergence of the 3rd generation of adult onion maggot is expected in 4-5 days. Over the next couple days, enough degree days will have accumulated indicated emergence of the 2nd generation of carrot rust fly in the Wellington area.
Here are the degree days accumulated from April 1st until July 31st, 2011.
| Area |
Onion Maggot(base 4) |
Cabbage Maggot(base 6) |
Carrot Rust Fly (base 3) |
Carrot Weevil (base 7) |
| Bradford/Holland Marsh* |
1442.9 |
N/A |
1560.7 |
N/A |
| Sarnia |
1410.6 |
1197.8 |
1524.2 |
1097.6 |
| London |
1457 |
1237.9 |
1571.1 |
1131.6 |
| Wellington |
1259.7 |
1047.6 |
1369.5 |
944.7 |
| Windsor |
1673.8 |
1444.3 |
1792.8 |
1336.9 |
| Area |
Tarnished Plant Bug (base 12) |
Leafhopper (base 9) |
GDD (base 5) |
| Bradford/Holland Marsh* |
642.9 |
911.9 |
1328.6 |
| Sarnia |
645.8 |
905.6 |
1302.1 |
| London |
652.1 |
928.1 |
1346.2 |
| Wellington |
500.9 |
752.3 |
1152.4 |
| Windsor |
846.9 |
1131.8 |
1556.5 |
* 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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