Bradford/Holland Marsh, Sarnia, and London areas have reached the degree day threshold for emergence of the 2nd generation of onion maggot. Degree days have accumulated in London and Sarnia areas indicating emergence of the 2nd generation of cabbage maggot. The Windsor area will reach the degree day threshold for emergence of the 2nd generation of carrot rust fly in the next few days. In the Wellington area, degree days have accumulated reaching the threshold indicating local emergence of adult aster leafhopper.
Here are the degree days accumulated from April 1st until July 11th, 2011.
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
| Bradford/Holland Marsh* |
1034.9 |
N/A |
1131.7 |
769.4 |
| Sarnia |
1013.1 |
840.3 |
1106.7 |
760.1 |
| London |
1059.6 |
880.5 |
1153.7 |
794.2 |
| Wellington |
897.4 |
725.3 |
987.2 |
642.4 |
| Windsor |
1227.7 |
1038.2 |
1326.7 |
950.8 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
| Bradford/Holland Marsh* |
402.9 |
608.9 |
941.6 |
| Sarnia |
408.3 |
608.1 |
924.6 |
| London |
414.7 |
630.7 |
968.8 |
| Wellington |
298.6 |
490 |
810.1 |
| Windsor |
560.8 |
785.7 |
1130.4 |
* 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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