In the Windsor area, emergence of the 2nd generation of onion maggot and cabbage maggot is expected soon (maybe 5-7 days) according to the accumulating degree days. Degree days have accumulated past the threshold indicating 90% oviposition of carrot weevil in the Wellington area. Local emergence of aster leafhopper adults is expected in the Wellington area in the next few days.
Here are the degree days accumulated from April 1st until June 27th, 2011.
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
| Bradford/Holland Marsh* |
795.4 |
N/A |
878.2 |
571.9 |
| Sarnia |
766.5 |
621.7 |
846.1 |
555.5 |
| London |
819.4 |
668.3 |
899.5 |
596 |
| Wellington |
684.1 |
540 |
759.9 |
471.1 |
| Windsor |
945.3 |
783.8 |
1030.3 |
710.4 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
| Bradford/Holland Marsh* |
275.5 |
439.4 |
716.1 |
| Sarnia |
273.7 |
431.5 |
692 |
| London |
286.5 |
460.5 |
742.6 |
| Wellington |
197.3 |
346.7 |
610.8 |
| Windsor |
390.4 |
573.3 |
862 |
* 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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