On 07/07/2015 11:30, Nick Maclaren wrote:
A nuisance in flowering brassica, being eaten, but harmless even in
quantity:-)

A few days have passed, and I'm backing off on the harmless.

We seem to be suffering a lot of plants not flowering well. On close
examination of a rose there were several hundred of the little
blighters, and the petals are all chewed up

Andy