Marion Paibomesai, Vegetable Crop Specialist, OMAFRA
Here are the degree days accumulated from April 1st until May 12th –15th, 2011.
|
Area |
Onion Maggot | Cabbage Maggot | Carrot Rust Fly |
GDD |
As of |
| Bradford/ Holland Marsh* | 166.6 | N/A | 203.4 | 133.3 | 13/05/2011 |
| Sarnia | 177.3 | 124.5 | 210.9 | 148.8 | 12/05/2011 |
| London | 233.1 | 168.0 | 270.2 | 199.3 | 15/05/2011 |
| Wellington | 169.4 | 111.3 | 202.2 | 139.1 | 15/05/2011 |
| Windsor | 274.0 | 198.5 | 316.0 | 225.3 | 15/05/2011 |
|
Area |
Carrot Weevil |
Tarnished Plant Bug |
Leafhopper |
GDD |
As of |
| Bradford/ Holland Marsh* | 81.2 | 10.3 | 40.9 | 133.3 | 13/05/2011 |
| Sarnia | 91.3 | 30.6 | 68.2 | 148.8 | 12/05/2011 |
| London | 138.7 | 37.7 | 87.4 | 199.3 | 15/05/2011 |
| Wellington | 84.9 | 13.0 | 44.5 | 139.1 | 15/05/2011 |
| Windsor | 168.1 | 54.9 | 115.2 | 225.3 | 15/05/2011 |
* 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 – 156 455 (90% oviposition) |
No model available |
n/a |
| Tarnished Plant Bug | 40 | n/a | n/a |
| Aster Leafhopper | 128 | 390 | n/a |
Enough degree days have accumulated indicating the emergence of 1st generation adults of onion maggot and the beginning of egg-laying for carrot weevil in the London and Windsor areas. Also in the Windsor area, the emergence of overwintering carrot rust fly adults and the hatching of overwintering aster leafhopper eggs is soon approaching. Still awaiting enough accumulations in the other areas.
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