During spring and early summer, waspsmainly on insects, including harmful species like . From about mid-June they begin to on both ripening and over-ripe fruits, notably apples, plums and pears. Nests are usually found in holes in the ground, in banks and at the foot of hollow trees. Note the direction in which wasps are flying and where they alight.
It is quite unnecessary to use a deadly poison, like cyanide. Denis, Pyrethrin or gamma-BHC (lindane) insecticides are far safer and quite effective. Place a tablespoonful of dust at, or just inside, the entrance to the nest, preferably in the evening.