Return to Spring/Summer pests 2005
2004/2005 SURVEY: SPRING PEST ASSESSMENT 2005
| Unsprayed crops at green-yellow bud were inspected for Pollen Beetle
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Pest monitoring in unsprayed commercial fields was undertaken at the green - yellow bud growth stage. It is at this stage that the crop is susceptible to economically significant feeding damage from pollen beetles chewing into the buds.
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| Site Location |
Number of sites |
Pollen beetle per plant per site |
Maximum Pollen beetle per plant |
| Bedfordshire |
2 |
0.8 |
1.1 |
| Cambridgeshire |
3 |
1.8 |
2.9 |
| Essex |
2 |
1.4 |
1.6 |
| Kent |
5 |
4.4 |
12.5 |
| Hampshire |
1 |
7.0 |
7.0 |
| Lincs |
5 |
10.0 |
27.0 |
| Northants |
4 |
2.9 |
3.9 |
| Oxfordshire |
6 |
2.2 |
3.4 |
| Shropshire |
7 |
1.5 |
2.9 |
| Somerset |
13 |
4.8 |
10.0 |
| Staffs |
5 |
3.9 |
10.9 |
| Suffolk |
6 |
1.9 |
3.1 |
| Wales |
8 |
2.8 |
11.1 |
| Warwickshire |
4 |
7.8 |
12.5 |
| Yorkshire |
13 |
4.9 |
11.6 |
| mean of all 84 sites |
3.8 |
27.0 |
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Thresholds
Published thresholds are 15 per plant for forward crops and 5 per plant for backward or thin crops.
Most of the crops investigated were growing well, several crops have been patchy and thin.
| Number of sites with more than 15 pollen beetles per plant: | 1 (1.2%) |
| Number of sites with more than 10 pollen beetles per plant: | 6 (7.1%) |
| Number of sites with more than 5 pollen beetles per plant: | 17 (20.2%) |
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