In Sarnia, the 3rd generation of cabbage maggot are expected to emerge in 7-8 days. In the London area, the 3rd generation of cabbage maggot are expected to emerge in 4-5 days. Enough degree days 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 August 8th, 2011.
| Area |
Onion Maggot(base 4) |
Cabbage Maggot(base 6) |
Carrot Rust Fly (base 3) |
Carrot Weevil (base 7) |
| Bradford/Holland Marsh* |
1568.2 |
N/A |
1692.9 |
N/A |
| Sarnia |
1562.9 |
1334.1 |
1684.5 |
1225.9 |
| London |
1609.9 |
1374.8 |
1732 |
1260.5 |
| Wellington |
1398.6 |
1170.5 |
1516.4 |
1059.6 |
| Windsor |
1845.6 |
1600.1 |
1972.6 |
1484.7 |
| Area |
Tarnished Plant Bug (base 12) |
Leafhopper (base 9) |
GDD (base 5) |
| Bradford/Holland Marsh* |
712.3 |
1002.2 |
1446.9 |
| Sarnia |
734.1 |
1017.9 |
1446.4 |
| London |
741 |
1041 |
1491.1 |
| Wellington |
575.8 |
851.2 |
1283.3 |
| Windsor |
954.7 |
1263.6 |
1720.3 |
* 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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