The threshold for second generation emergence of onion maggot flies has been reached in Wellington. Degree day accumulations indicate peak of second generation cabbage maggot in the Wellington. The threshold for emergence of second generation carrot rust fly should be reached in Thedford and London areas in a couple days and the Bradford/Holland Marsh area in ~5 days.
Here are the degree days accumulated from April 1st until July 18th, 2012.
(These values are provided as guidelines only. Local environments, soil type, field history, etc. may influence activity of these pests.)
| Area |
Onion Maggot (base 4) |
Cabbage Maggot (base 6) |
Carrot Rust Fly (base 3) |
Carrot Weevil (base 7) |
As of |
| Bradford/Holland Marsh* |
1216.5 |
n/a |
1320.1 |
n/a |
17/07/2012 |
| London |
1280.5 |
1080 |
1386.3 |
989.8 |
17/07/2012 |
| Wellington |
1121.8 |
942.3 |
1219.3 |
859.0 |
17/07/2012 |
| Windsor |
1512.6 |
1300.7 |
1620.5 |
1198.5 |
17/07/2012 |
| Thedford |
1271.2 |
1076.7 |
1375.8 |
985.2 |
17/07/2012 |
| Delhi |
1168.1 |
982.3 |
1270.2 |
900 |
17/07/2012 |
| Ridgetown |
Data not updated since 28 May 2012 |
| Area |
Tarnished Plant Bug (base 12) |
Leafhopper (base 9) |
GDD (base 5) |
As of |
| Bradford/Holland Marsh* |
549.9 |
782.6 |
999.4 |
17/07/2012 |
| London |
585.8 |
823.2 |
1178.2 |
17/07/2012 |
| Wellington |
468.0 |
697.7 |
1029.3 |
17/07/2012 |
| Windsor |
748.2 |
1006.7 |
1405.8 |
17/07/2012 |
| Thedford |
579.5 |
816.7 |
1171.5 |
17/07/2012 |
| Delhi |
519.2 |
743.4 |
1071.1 |
17/07/2012 |
| Ridgetown |
Data not updated since 28 May 2012 |
*Data provided by Muck Crops Research Station, University of Guelph.
Degree day model 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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