Enough degree days have accumulated indicating the emergence of 1st generation adults of onion maggot and carrot rust fly in all regions. Also, enough degree days have accumulated indicating egg-laying for carrot weevil, the appearance of tarnished plant bug nymphs and hatching of overwintering eggs of aster leafhopper (except Wellington). Cabbage maggot adults are starting to emerge in Windsor and will start emerging soon in other areas.
Here are the degree days accumulated from April 1st until May 27th-30th, 2011.
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
As of |
| Bradford/HollandMarsh* |
332.1 |
N/A |
382.9 |
204.8 |
27/05/2011 |
| Sarnia |
338.8 |
252 |
389.4 |
214.8 |
30/05/2011 |
| London |
391.5 |
298.4 |
442.6 |
255.1 |
30/05/2011 |
| Wellington |
308.9 |
222.8 |
355.7 |
182.9 |
30/05/2011 |
| Windsor |
440.4 |
336.9 |
496.4 |
292.5 |
30/05/2011 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
As of |
| Bradford/HollandMarsh* |
68.2 |
136.1 |
284.8 |
27/05/2011 |
| Sarnia |
76.3 |
148.8 |
293.3 |
30/05/2011 |
| London |
90.4 |
177.6 |
343.7 |
30/05/2011 |
| Wellington |
51.9 |
116.5 |
264.6 |
30/05/2011 |
| Windsor |
117.5 |
213.4 |
386.1 |
30/05/2011 |
* 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 |
No model available |
n/a |
| Tarnished Plant Bug |
40 |
n/a |
n/a |
| Aster Leafhopper |
128 |
390 |
n/a |
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