Question
MY FRONT LAWN HAS BEEN INVADED BY DIGGER BEES AND CICADA EATING WASPS.  IN THE SPRING THEY MAKE HUGE HOLES.  HOW CAN I GET RID OF THEM.  IM SURE THAT MY LAWN IS A MAZE OF TUNNELS UNDER GROUND.  

Answer
A noticeable mound of soil surrounds the burrow of each cicada killer wasp. Since colonies of burrows are common, infested lawns usually contain several mounds that can smother the grass. However, since cicada killer wasps prefer to nest in areas of sparse vegetation, it is likely that an infested turf was already unthrifty when the wasps arrived. They rarely burrow in thick, vigorous turf. A vertical or slightly angled burrow 6 to 9 inches deep and 1/2 inch in diameter with broadly oval cells perpendicular to the main tunnel is excavated. The excess soil thrown out of the burrow forms a symmetrical, U-shaped mound at the entrance.

Cultural practices can prevent or eliminate the establishment of cicada killer colonies. Adequate lime and fertilizer applications accompanied by frequent watering promote a thick growth of turf and can usually eliminate a cicada killer infestation in one or two seasons. Usually the perceived need for control is based in fear rather than fact. In case of a severe infestation, chemical control may be desired to prevent or allay fears of wasp stings.

Cicada killers can be efficiently controlled by treatment with liquid insecticidal lawn sprays. Treat the ground area where the wasps are burrowing. Also, each burrow can be individually dusted with a dust formulation to control the wasps.