Cabbage & Cauliflower pest

[Wheatyman]

Hi all
Hope someone can help only had my allotment about 8 weeks I bought some cabbage & cauliflower plants from the local garden centre and planted them out all’s been well until today. When weeding I noticed a small area on the leaves, purplish in colour with small flies on them.  Any ideas what they are and what can I do to get rid of them.

[Wheatyman]

[saddad]

Sounds like the start of Mealy aphids... check on the reverse of the purple patches for grey mush... and squish it...
:o

[Wheatyman]

Saddad

Went down and checked the purple patches and your right grey mush on the reverse side is there an easy way to deal with these aphids.

thanks for your help its much appreciated

[Tee Gee]

Have a look in here; http://tinyurl.com/2lrslv this might help!