Cicada killer wasp

The Cicada killer wasp (Sphecius speciosus) is a member of the Hymenoptera order and the Crabronidae family. It is a large, solitary wasp species that is widely recognized for its hunting behavior, specifically targeting cicadas. While these wasps are not considered major agricultural pests, they are often perceived as problematic by homeowners due to their imposing size and nesting habits.

These wasps do not damage plants by feeding on them. Instead, the damage is primarily physical and structural. They construct their nests by digging deep burrows into the soil, particularly in areas with loose or dry dirt. This activity results in large mounds of soil being displaced onto the surface, which ruins the appearance of lawns and landscapes.

The life cycle begins in mid-summer when adult females emerge to hunt. A single female digs a burrow and captures cicadas, which she paralyzes with a sting. She carries the cicada into her burrow, deposits an egg on it, and seals the chamber. The larva consumes the paralyzed cicada over several days and eventually overwinters underground in a cocoon, emerging as an adult the following year.

The primary concern is the damage to garden aesthetics and potential stress to young plants. When many wasps nest in the same area, the sheer number of entry holes and soil piles can make the ground unstable and unsightly. In rare cases, the extensive tunneling near the roots of ornamental shrubs or young trees can affect their stability, though this is seldom the cause of plant death.

• Keep lawn grass thick and well-watered.
• Apply mulch to garden beds to discourage ground nesting.
• Use contact insecticides directly into burrow entrances.
• Cover bare patches of soil with landscaping fabric.
• Minimize excessive tillage in areas prone to wasp activity.

Management strategies focus on making the soil environment less suitable for burrowing. Maintaining a dense, healthy lawn and regular irrigation are the most effective deterrents, as Cicada killers prefer dry, sparse areas. If control is necessary, treating individual burrow entrances with a registered insecticide dust during the period when the wasps are active is the standard professional approach.