Yellow water traps and cabbage root fly eggs at Wellesbourne 2025
These are the numbers of pest insects captured in yellow water traps at Wellesbourne and numbers of cabbage root fly eggs laid on 15 cauliflower plants.
CRF = cabbage root fly; CSFB = cabbage stem flea beetle; cq = cabbage stem weevil; ca = cabbage seed weevil
| Date | CRF males | CRF females | CRF eggs (15 plants) | Bean seed flies | Pollen beetle | Flea beetles | Brassica weevils | CSFB | Small white butterfly | Large white butterfly |
|---|---|---|---|---|---|---|---|---|---|---|
| 4 April | 7 | 2 | - | 1 | 8 | 5 | 1 CQ | 2 | ||
| 8 April | 2 | 0 | - | 2 | 32 | 16 | 11 CQ, 1 CA | 1 | ||
| 11 April | 0 | 0 | - | 2 | 37 | 19 | 14 CQ, 3 CA | 0 | ||
| 15 April | 0 | 0 | - | 1 | 48 | 32 | 59 CQ, 42 CA | 5 | ||
| 17 April | 0 | 0 | - | 0 | 94 | 21 | 16 CQ, 19 CA | 0 | ||
| 22 April | 0 | 0 | - | 1 | 4 | 3 | 3 CQ, 1 CA | 0 | ||
| 25 April | 7 | 3 | 8 | 8 | 18 | 11 | - | 0 | ||
| 29 April | 4 | 1 | 45 | 2 | 27 | 402 | 23 CQ, 2 CA | 0 | ||
| 2 May | 1 | 0 | 39 | 0 | 1 | 783 | 44 CQ, 9 CA | 5 | ||
| 6 May | 4 | 2 | 12 | 1 | 0 | 380 | 2 CA | 0 | ||
| 9 May | 5 | 1 | 7 | 2 | 1 | 63 | 2 CQ, 1 CA | 0 | ||
| 13 May | 4 | 4 | 7 | 2 | 3 | 552 | 19 CQ, 32 CA | 0 | ||
| 16 May | 4 | 1 | 3 | 5 | 3 | 273 | 15 CQ, 16 CA | 1 | ||
| 20 May | 4 | 9 | 0 | 8 | 245 | 322 | 25 CQ, 7 CA | 0 | ||
| 23 May | 0 | 5 | 0 | 6 | 109 | 400 | 67 CQ, 34 CA | 0 | ||
| 27 May | 1 | 2 | 4 | 5 | 69 | 262 | 48 CQ, 9 CA | 0 | ||
| 30 May | 2 | 1 | 0 | 3 | 74 | 105 | 14 CQ, 4 CA | 0 | ||
| 3 June | 8 | 11 | 1 | 11 | 327 | 185 | 17 CQ, 10 CA | 0 | ||
| 6 June | 0 | 3 | 0 | 8 | 706 | 10 | 2 CQ, 1 CA | 0 | ||
| 10 June | 5 | 3 | 0 | 10 | 868 | 0 | 14 CQ, 1 CA | 0 | ||
| 13 June | 6 | 3 | 0 | 2 | 3553 | 4 | 42 CQ, 8 CA | 3 | ||
| 17 June | 15 | 7 | 0 | 5 | 2754 | 46 | 93 CQ, 2 CA | 10 | ||
| 20 June | 6 | 14 | 0 (OLD PLANTS, 10 (NEW PLANTS) | 2 | 1088 | 206 | 65 CQ, 15 CA | 6 | ||
| 24 June | 3 | 8 | 1 (new plants) | 6 | 291 | 176 | 39 CQ, 2 CA | 2 | ||
| 27 June | 2 | 13 | 5 | 1 | 238 | 1027 | 137 CQ, 5 CA | 1 | 1 | 0 |
| 1 July | 26 | 6 | 22 | 3 | 288 | 663 | 24 CQ, 3 CA | 2 | 0 | 0 |
| 4 July | 16 | 16 | 5 | 5 | 246 | 679 | 9 CQ, 3 CA | 1 | 0 | 0 |
| 8 July | 10 | 20 | 58 | 6 | 120 | 533 | 6 CQ, 0 CA | 0 | 1 | 0 |
| 11 July | 5 | 19 | 19 | 3 | 67 | >8,000 | 13 CQ, 1 CA | 0 | 1 | 0 |
| 15 July | 12 | 98 | 36 | 8 | 52 | 9,300 est | 23 CQ, 1 CA | 1 | 0 | 0 |
| 18 July | 0 | 15 | 54 | 0 | 9 | 8,400 est | 2 CQ. 0CA | 0 | 0 | 0 |
| 22 July | 0 | 11 | 13 | 7 | 8 | 4,700 est | 1 CQ, 0 CA | 1 | 1 | 0 |
| 25 July | 1 | 2 | 5 | 3 | 1 | 9,000 est | 3 CQ, 0 CA | 0 | 1 | 0 |
| 29 July | 1 | 4 | 0 | 2 | 2 | 1613 | 14 CQ, 0 CA | 0 | 0 | 0 |
| 1 August | 7 | 5 | 3 | 5 | 0 | 1277 | 17 CQ, 0 CA | 0 | 0 | 0 |
| 5 August | 6 | 13 | 3 | 9 | 1 | 788 | 6 CQ, 0 CA | 2 | 0 | 2 |
| 8 August | 16 | 14 | 0 | 14 | 4 | 202 | 2 CQ, 0 CA | 0 | 1 | 0 |
| 12 August | 53 | 15 | 0 | 22 | 3 | 439 | 1 CQ, 1 CA | 1 | 1 | 0 |
| 15 August | 49 | 12 | 3 | 13 | 0 | 258 | 0 CQ, 0 CA | 1 | 0 | 0 |
| 19 August | 58 | 15 | 0 | 26 | 1 | 162 | 0 CQ, 0 CA | 0 | 0 | 0 |
| 22 August | 14 | 8 | 1 | 7 | 0 | 10 | 0 CQ, 0 CA | 0 | 0 | 0 |
| 26 August | 12 | 24 | 0 | 10 | 1 | 62 | 0 CQ, 0 CA | 0 | 0 | 0 |
| 29 August | 4 | 11 | 1 | 1 | 0 | 27 | 0 CQ, 0 CA | 0 | 0 | 0 |