For the Wellington area, according to the degree day accumulations expect 3rd generation adult emergence of onion maggot in 5-6 days and emergence of 3rd generation cabbage maggot adults in the next day or so.
Here are the degree days accumulated from April 1st until August 30th, 2011.
| Area |
Onion Maggot(base 4) |
Cabbage Maggot(base 6) |
Carrot Rust Fly (base 3) |
Carrot Weevil (base 7) |
| Bradford/Holland Marsh* |
1895.5 |
N/A |
2041.3 |
N/A |
| Sarnia |
1922.3 |
1649.5 |
2065.9 |
1519.3 |
| London |
1956.4 |
1677.3 |
2100.5 |
1541 |
| Wellington |
1711.6 |
1439.5 |
1851.4 |
1306.6 |
| Windsor |
2236.6 |
1947.1 |
2385.6 |
1809.7 |
| Area |
Tarnished Plant Bug (base 12) |
Leafhopper (base 9) |
GDD (base 5) |
| Bradford/Holland Marsh* |
871.6 |
1224.5 |
1753.2 |
| Sarnia |
917.5 |
1267.3 |
1783.8 |
| London |
911.5 |
1277.5 |
1815.6 |
| Wellington |
712.8 |
1054.2 |
1574.3 |
| Windsor |
1169.7 |
1544.6 |
2089.3 |
* 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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