Return to Spring pests 2006
2005/2006 SURVEY: SPRING/SUMMER PEST ASSESSMENT 2006
Unsprayed crops at early flowering were inspected for Cabbage Seed Weevil and Pollen Beetle.
Around 50 sites will be inspected for this first spring/summer assessment. |
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It is at the early flowering growth stage that the Cabbage Seed Weevil begins migrating into the crop.
The adults do not cause any economic feeding damage, but will lay their eggs on the developing pods and their
larvae feed on the seeds.
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| Site Location |
Number of sites |
Cabbage Seed Weevil per plant per site |
Maximum Cabbage Seed Weevil per plant |
| North |
10 |
0.14 |
0.70 |
| East |
13 |
0.28 |
0.95 |
| Midlands |
13 |
0.38 |
2.00 |
| Wales |
4 |
0.06 |
0.15 |
| South |
12 |
0.04 |
0.15 |
| mean of all 52 sites |
0.20 |
2.00 |
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Thresholds
Published thresholds are 2 per plant, unless the site has a history of Brassica Pod Midge problems. If this is the case the threshold drops to 1 per plant
| Number of sites with more than 2 cabbage seed weevil per plant: | 1 (1.9%) |
| Number of sites with more than 1 cabbage seed weevil per plant: | 2 (3.8%) |
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| Site Location |
Number of sites |
Pollen beetle per plant per site |
Maximum Pollen beetle per plant |
| North |
10 |
4.44 |
11.70 |
| East |
13 |
2.69 |
18.50 |
| Midlands |
13 |
4.07 |
17.75 |
| Wales |
4 |
4.10 |
4.50 |
| South |
12 |
1.86 |
4.05 |
| mean of all 52 sites |
3.29 |
18.50 |
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