"How do you stop this. Does anyone have a solution for this."

Vita Europe is planning a new hornet trap pheromone attractant based
http://vitaeurope.s3.amazonaws.com/VitaNL201104.pdf

...but I think no solution; Vespula velutina is spreading...now in
Spain (North and East)...and Portugal

P.David Quesada
Honey Bee Pathology Lab
Government of Extremadura; Spain

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