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Ooooh, what a nightmare, wasps are nasty in any form -- can you get Pest Control or the council involved ?
Yikes. I would put jars of Cointreau near their hideouts, they love the stuff and it seems to kill them quite well. Left a glass out in the garden once and the next day it was full of dead wasps!
well, apart from 6 jam jars full of dead ones, most of them to have gone, maybe because we've cleared most of the apples and pears..still a few at the top of the tree but that's about 20' tall so they're not bothering us ;D