Thresholds for second generation emergence of onion maggot flies and cabbage maggot flies have been reached in the Windsor area. The threshold for emergence of local adult leafhoppers has been reached in all areas.
No new leek moth captures this week in Southwestern Ontario, while second flight of leek moth is underway in Quebec. Registered insecticides can be applied 7-10 days after peak flight according to pheromone traps, in order to target larva.
Here are the degree days accumulated from April 1st until June 27th, 2012.
(These values are provided as guidelines only. Local environments, soil type, field history, etc. may influence activity of these pests.)
| Area |
Onion Maggot |
Cabbage Maggot |
Carrot Rust Fly |
Carrot Weevil |
As of |
| Bradford/Holland Marsh* |
832.6 |
n/a |
915.2 |
626.5 |
26/06/2012 |
| London |
878.5 |
718 |
964.3 |
647.8 |
27/06/2012 |
| Wellington |
760.6 |
621.1 |
838.1 |
557.8 |
27/06/2012 |
| Windsor |
916.9 |
761 |
996.8 |
686.8 |
27/06/2012 |
| Thedford |
870.7 |
716.2 |
955.3 |
644.7 |
27/06/2012 |
| Delhi |
851.5 |
697.7 |
937.6 |
631.4 |
27/06/2012 |
| Ridgetown |
|
|
|
|
Data not updated since 28 May 2012 |
| Area |
Tarnished Plant Bug |
Leafhopper |
GDD |
As of |
| Bradford/Holland Marsh* |
334.0 |
503.7 |
759.9 |
26/06/2012 |
| London |
343.8 |
521.2 |
796.2 |
27/06/2012 |
| Wellington |
266.8 |
436.5 |
688.1 |
27/06/2012 |
| Windsor |
376.5 |
551 |
838.1 |
27/06/2012 |
| Thedford |
339 |
516.2 |
791 |
27/06/2012 |
| Delhi |
330.6 |
506.8 |
770.5 |
27/06/2012 |
| Ridgetown |
|
|
|
Data not updated since 28 May 2012 |
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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