Enough degree days have accumulated indicating the emergence of cabbage maggot adults in the Wellington area. Also, sufficient degree days will accumulate soon in the Bradford/Holland Marsh and London areas indicating 90% oviposition of carrot weevil. Local emergence of aster leafhopper adults is expected in the Windsor area. Also, expect local aster leafhopper adults to start emerging in the London area over the next few days, especially if it warms up as forecasted.
Here are the degree days accumulated from April 1st until June 13th, 2011.
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
As of |
| Bradford/HollandMarsh* |
584.1 |
N/A |
652.9 |
402.7 |
13/06/2011 |
| Sarnia |
559 |
442.2 |
624.6 |
390 |
13/06/2011 |
| London |
607.7 |
484.6 |
673.8 |
426.3 |
13/06/2011 |
| Wellington |
496.8 |
380.7 |
558.6 |
325.8 |
13/06/2011 |
| Windsor |
708.2 |
574.7 |
779.2 |
515.3 |
13/06/2011 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
As of |
| Bradford/HollandMarsh* |
176.2 |
298.1 |
518.8 |
13/06/2011 |
| Sarnia |
178.2 |
294 |
498.5 |
13/06/2011 |
| London |
186.8 |
318.8 |
544.9 |
13/06/2011 |
| Wellington |
122 |
229.4 |
437.5 |
13/06/2011 |
| Windsor |
265.3 |
406.2 |
638.9 |
13/06/2011 |
* 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 |
No model available |
n/a |
| Tarnished Plant Bug |
40 |
n/a |
n/a |
| Aster Leafhopper |
128 |
390 |
n/a |
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