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