In the Windsor area, accumulated degree days indicate emergence of the 2nd generation of onion maggot and cabbage maggot. Local emergence of aster leafhopper adults is expected in the Wellington area.
Here are the degree days accumulated from April 1st until July 4th, 2011.
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
| Bradford/Holland Marsh* |
906.2 |
N/A |
995.9 |
661.7 |
| Sarnia |
883 |
724.2 |
969.6 |
651 |
| London |
930.8 |
765.7 |
1017.9 |
686.4 |
| Wellington |
779.3 |
621.2 |
862.1 |
545.3 |
| Windsor |
1081.9 |
906.4 |
1173.9 |
826 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
| Bradford/Holland Marsh* |
330.2 |
515.1 |
819.9 |
| Sarnia |
334.2 |
513 |
801.5 |
| London |
341.9 |
536.9 |
847 |
| Wellington |
236.5 |
406.9 |
699 |
| Windsor |
471 |
674.9 |
991.6 |
* 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 |
390 |
n/a |
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