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Yellow water traps and cabbage root fly eggs at Wellesbourne 2024

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
14 Jun 1 1 5 9 8 2 6 cq 2
11 Jun 0 3 14 11 11 4 4 cq 3
7 Jun 1 15 16 7 30 3 6 cq 6
4 Jun 3 7 11 1 25 22 18 cq , 1 ca 6
31 May 5 27 33 45 13 7 161 cq, 1 ca 4
28 May 29 35 29 15 8 14 16cq 3
24 May 2 1 59 25 1 1 2 cq 0
21 May 4 4 159 4 7 78 56 cq, 10 ca 3
17 May 2 1 273 6 9 2 6 cq 0
14 May 0 1 205 3 9 0 1 cq 8
10 May 7 1 122 0 15 3 5 cq, 1 ca 2
7 May 21 12 79 29 149 1 14 cq, 3 ca 4
3 May 36 5 71 12 290 1 40 cq 0
30 Apr 20 7 55 8 145 1 15 cq 0
26 Apr 21 7 34 15 23 1 0 0
23 Apr 23 15 51 (5 days) 38 77 7 8 cq 0
16 Apr 32 9 78 (5days) 20 156 0 1 cq 0
9 Apr 11 7 - 66 97 16 4 cq 1
2 Apr 15 4 - 80 153 5 19 cq 1
26 Mar 2 0 - 18 630 1 21 cq 0
19 Mar 0 0 - 36 138 2 5 cq 2
12 Mar 0 0 - 24 186 1 2 cq 0
5 Mar 1 0 - 21 5 1 0 1
27 Feb 0 2 - 18 1 0 0 0
20 Feb 0 0 - 28 9 0 0 1