Yellow water traps and cabbage root fly eggs at Wellesbourne 2026

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
8 April
11 April
15 April
17 April
22 April
25 April
29 April
2 May
6 May
9 May
13 May
16 May
20 May
23 May
27 May
30 May
3 June
6 June
10 June
13 June
17 June
20 June
24 June
27 June
1 July
4 July
8 July
11 July
15 July
18 July
22 July
25 July
29 July
1 August
5 August
8 August
12 August
15 August
19 August
22 August
26 August
29 August
2 September
5 September
9 September
12 September
16 September
19 September
23 September
26 September
30 September
3 October
7 October
10 October
14 October
17 October
21 October
24 October
28 October
31 October
4 November
7 November
11 November
14 November
18 November
21 November
25 November
28 November