Misidentification of stinging insects leads to either underreaction (leaving a yellow jacket ground nest near a high-traffic area) or unnecessary alarm (treating a solitary cicada killer that poses essentially no sting risk). The four species below cover the vast majority of homeowner stinging insect encounters in Missouri.
The Four Species
Eastern Yellow Jacket (Vespula maculifrons)
Missouri's most dangerous stinging insect from a practical standpoint. Yellow and black banding, roughly 1/2 inch, and highly aggressive when nests are disturbed. Nests underground (most common) or in wall voids — the underground location makes accidental disturbance by lawn equipment the most frequent trigger for mass stinging events. Colony size reaches 1,000–4,000 workers by August–September. The elevated late-summer aggression is a consistent pattern as colony resources diminish.
Northern Paper Wasp (Polistes fuscatus)
Slender brownish wasp, 3/4 to 1 inch, building the open-comb umbrella nests under eaves, window frames, and deck railings that most people picture when they think of wasps. Significantly less aggressive than yellow jackets — paper wasps will defend nests if directly threatened but do not pursue. Small colony size (20–30 workers) makes eave nests a manageable DIY treatment if done at night when all workers are present.
Bald-Faced Hornet (Dolichovespula maculata)
Black and white, large (3/4 inch), building the distinctive gray papery football-shaped aerial nests in trees and shrubs. Extremely aggressive nest defenders — will pursue threats well beyond the nest perimeter. Nest size can reach 400–700 workers by late summer. Professional removal is strongly recommended; aerial nests in high-traffic areas are an urgent treatment priority.
Cicada Killer (Sphecius speciosus)
Missouri's largest wasp — females up to 1.5 inches — digging individual burrows in lawns and sandy soil. Alarming in appearance but essentially non-aggressive toward humans. Males are territorial and may investigate people but cannot sting. Females rarely sting unless physically handled. Cicada killers are beneficial predators and burrow populations rarely require treatment unless nesting concentration is causing turf damage.
D&D Pest Control provides wasp and stinging insect treatment for Franklin County and rural Missouri — visit ddpestcontrolmo.com.