I have a wasps nest on my allotment, and they appear to adore crawling all over my brassicas, which I must say are quite devoid of aphids or caterpillars. Are the wasps my friends, or should I ask them to leave quietly?
Hmmmm, I have a similar problem. Looking forward to the reply.
Wasps are useful predators. = Tim
Later - Just seen Stephan's reply to your other question.