FV 416b – cabbage root fly egg counts in Cornwall
The egg counts up to Monday 29th June are as follows - they show the mean numbers of eggs per week found around a sample of 20 plants per location:
| Helston | Hayle | Gwithian | Truro | St Columb | |
| 20-Apr | 0.2 | 1.2 | 0.3 | 0.3 | 0.9 |
| 27-Apr | 0.9 | 12.0 | 2.1 | 1.2 | 18.0 |
| 05-May | 0.8 | 12.2 | 8.2 | 4.0 | 4.1 |
| 11-May | 2.6 | 20.1 | 2.8 | 3.1 | 5.7 |
| 18-May | 4.7 | 17.1 | 1.7 | 5.6 | 19.8 |
| 25-May | 2.3 | 7.4 | 0.4 | 0.7 | 18.4 |
| 01-Jun | 0.3 | 4.1 | 1.1 | 0.9 | 0.9 |
| 08-Jun | 0.6 | 5.4 | 0.3 | 0.2 | 1.0 |
| 15-Jun | 0.3 | 2.2 | 0.5 | 0.3 | 1.4 |
| 22-Jun | 0.7 | 4.6 | 0.8 | 0.5 | 0.4 |
| 29-Jun | 2.15 | 3.85 | 0.25 | 0.95 | 1.15 |
Rosemary Collier
01 Jul 2015 09:09
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