Captures by the network of traps run by the Rothamsted Insect Survey are shown below:

Brevicoryne brassicae	Inverness	Dundee	Edinburgh	Ayr	Newcastle	FERA, York	Preston	Kirton	Broom's Barn	Wellesbourne	Hereford	Rothamsted	Writtle	Ascot	East Malling	Starcross	Total
Week ending
07-Apr					0	0		0	0	0	0	0	0	0	0	0	0
14-Apr					0	0		0	1	0	0	0	0	0	0	0	1
21-Apr					0	0		0	0	0	0	0	0	0	0	0	0
28-Apr		0	0		0	0		0	1	0	0	0	0	0	0	0	1
05-May		0	0	0	0	0		0	25	1	0	2	2	4	3	0	37
12-May					0	9		3	480	47	8	18	46	7	6	2	626
19-May		0	0	0	0	7		5	329	48	5	25	103	28	11	1	562
26-May	0	0	0	0	0	2		1	312	50	5	26	4	5	4	0	409
02-Jun	0	0	1	0	0	0		0	2	3	0	5	1	1	1	0	14
09-Jun	0	0	0	0	0	0		0	4	8	0	6	2	4	3	0	27
16-Jun	0	1	0	0	0	1		0	1	9	2	1	0	1	1	2	19
23-Jun	0	0	0	0	0	0		0	8	40	10	5	0	12	0	2	77
30-Jun					0	6		1	14	126	41	17	6	9	5	2	227
07-Jul		1	0		0	2		2	3	1	13	5	3	6	1	2	39
14-Jul	0	0	0		0	3		4	15	14	6	4	1	2	1	0	50
21-Jul	0	2	0		2	1		6	4	12	4	4	1	2	2	1	41
28-Jul	0	3	1		0	0		6	1	3	1	1	3	1	0	0	20
04-Aug	0	1	0		0	1		3	1	5	4	2	2	0	0	1	20
11-Aug	0	1	0	0	0	4		2	0	1	0	0	1	0	2	0	11
18-Aug	0	0	0	0	0	1		2	1	0	0	2	1	0	0	2	9
25-Aug	0	0	0	0	0	0		0	0	0	1	0	0	0	0	0	1
01-Sep	0	1	1		0	1		6	0	0	1	0	1	1	2	0	14
08-Sep	0	1	0		0	1		28	2	0	0	1	2	0	0	2	37
15-Sep					0	2		22	0	0	1	0	0	0	0	1	26
22-Sep					0	3		18	15	1	0	3	0	0	5	0	45
29-Sep					0	6		38	1	1	0	0	3	0	0	2	51
06-Oct					0	1		4	5	0	0	0	3	0	1	0	14
13-Oct					0	2		4	0	0	0		1	0	0	0	7
20-Oct					0	2		2	1	2	0	0	0	0	1	0	8