I've seen whitefly and greenfly many times but all my sprouts are now
infested with grey ones, they live on the underside of leaves and their give
away is a yellow patch on the face of the leaf, sometimes they cover about 3
inches in each 'camp', I've just been squashing them with my thumb but now
they seem to have gone berserk and are even down in the growing
tip....coupled with a large caterpillar problem, the sprouts certainly seem
to be struggling...any ideas?

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If God had intended us to drink beer, He would have given us stomachs.