7A Ch12 Cheat Sheet: Stinging Pests

🎯 Top 5 Traps

1

Honeybee colonies in wall voids MUST have the nest REMOVED after killing — or honey will permanently stain walls. Without bees to cool them, wax combs melt and honey flows down through walls. Honey stain CANNOT be removed — walls must be REPLACED. Free honey attracts robber bees and wasps; wax attracts wax moths (persist for years); dead bees attract carpet beetles. Caulk or repair the entrance hole after removal.

2

A stinger remaining in the victim does NOT guarantee the insect was a honeybee. The Eastern yellow jacket (Vespula maculifrons) has a slightly barbed stinger that often sticks. When the insect is slapped off, the stinger may remain. When a retained stinger is found, the insect cannot always be assumed to be a honeybee.

3

Yellow jacket stings can cause BLOOD POISONING — anaerobic bacteria injection is a real risk. When yellow jackets frequent wet manure and sewage, they pick up anaerobic bacteria on their abdomens and stingers. The stinger becomes a hypodermic needle that can inject bacteria beneath the victim's skin. Blood poisoning should be kept in mind whenever yellow jacket stings occur.

4

Bald-faced "hornet" is BLACK AND WHITE (NOT black and yellow) — and is actually a YELLOW JACKET (genus Dolichovespula). Larger than other yellow jackets. Lives along the West Coast, across Canada, and in all states in the eastern half of the country. Nest is 4 to 6 wide circular combs hanging one below another, enclosed in an oval paper envelope. Aerial colonies can have 400-700 workers.

5

Carpenter bees drill into the END GRAIN of structural wood — then TURN and tunnel WITH the grain. They prefer UNPAINTED wood (redwood, deck timbers); they will go into painted wood if a start hole is present. Treatment: dust tunnels or inject pressurized liquid insecticide, then insert a DUSTED PLUG of STEEL WOOL or COPPER GAUZE, then fill the opening with caulk, wood filler, or a wooden dowel. The dusted plug stops new adults that would otherwise emerge through shallow caulking.

🔢 Numbers You Must Know

Number

What It Represents

8 to 12 feet

Effective propulsion distance of pressurized sprays for paper wasp control

10 to 30 seconds

Recommended pesticide release time when inserting tube into yellow jacket entrance hole

4 to 6 wide circular combs

Bald-faced hornet (Dolichovespula maculata) full nest structure — hanging one below another, enclosed in oval paper envelope

400 to 700 workers

Bald-faced hornet aerial colony at peak

5,000 or more

Eastern yellow jacket (V. maculifrons) colony size

18 species

Yellow jacket species in North America (only a few require management)

More than 1 inch

Cicada killer length — looks like a "monster" yellow jacket but is harmless

1 year

Carpenter bee lifespan — solitary insects with NO worker caste

November/December

German yellow jacket activity persistence in protected voids when outside temperatures are not severe

March/April to end of July

Aerial yellow jacket (D. arenaria) colony cycle — finished and no longer active by end of July

Spring

Carpenter bee egg laying and tunnel provisioning season

3 castes

Vespid colony composition: queen (overwintering female reproductive), female workers (sterile daughters), late-season males + new queens

🔀 Easily Confused

Pair / Group

Distinguishing Feature

Social vs Solitary stinging insects

Social: paper wasps, yellow jackets, hornets, honeybees, ants. Single queen + worker caste; AGGRESSIVE because workers can be expended to defend colony. Solitary: mud daubers, cicada killers, carpenter bees. Single fertile females; NO worker caste; not aggressive — won't sting unless pressed/handled.

Paper wasp queen vs Yellow jacket/hornet queen

Paper wasp: queens and workers SAME SIZE. Nest = single umbrella comb (NO envelope). Yellow jacket / hornet: queens are LARGER than their daughter workers. Nests are enveloped (paper envelope around combs).

Aerial vs Ground yellow jackets

Aerial (Dolichovespula): aerial yellow jacket + bald-faced hornet — football-shaped paper "hornet's nest" attached to overhangs/trees/buildings. Ground (Vespula): common, eastern, German yellow jackets — black and yellow with primarily yellow bands; nests in soil depressions, rodent burrows, wall voids, attics.

Bald-faced hornet vs other yellow jackets

All in the family Vespidae. Bald-faced hornet: BLACK AND WHITE (not yellow), LARGER, family Dolichovespula. Other yellow jackets: black and yellow with yellow bands. Despite the name, the bald-faced hornet is technically a yellow jacket.

German yellow jacket: Europe vs North America

In Europe: nests are subterranean. In North America: vast majority of reported nests are IN STRUCTURES — attics and wall voids. Workers can chew through ceilings and walls into adjacent rooms. Nest paper is strong, light gray. May remain active into November/December.

Honeybee vs Eastern yellow jacket sting retention

Both can leave a stinger in the victim. Honeybee: barbed stinger always sticks. Eastern yellow jacket: slightly barbed stinger; often sticks and may remain when slapped off. A retained stinger is NOT diagnostic of honeybee.

Carpenter bee vs Bumblebee

Carpenter bee (Xylocopa virginica): solitary; large; HAIRY YELLOW THORAX + SHINY BLACK ABDOMEN; bores in wood. Bumblebee: SOCIAL; more closely related to honeybees; superficially similar yellow-and-black appearance to carpenter bees. The shiny black abdomen is the cleanest visual distinguisher for the eastern carpenter bee.

Mud dauber vs Yellow jacket

Mud dauber (Sphecidae): SOLITARY; slender shiny black/brown/orange/yellow with black markings; many have long thread-like waists; place mud nests in protected places (electric motors, sheds, attics, against siding, under porch ceilings); paralyze SPIDERS to provision cells; not aggressive. Yellow jacket (Vespidae): SOCIAL; black-and-yellow; aggressive; paper nests.

Cicada killer vs Yellow jacket

Cicada killer: more than 1 INCH long ("monster yellow jacket"), large yellow and black, but SOLITARY (Sphecidae) and HARMLESS — females rarely sting. Yellow jacket: smaller, social, aggressive. Cicada killers can usually be ignored.

Vespid colony lifespan vs Honeybee colony lifespan

Vespid colonies (paper wasps, yellow jackets, hornets): start a NEW COLONY EACH YEAR. Old nest disintegrates and is not reused. Males die in winter; new fertilized queens overwinter. Honeybees: live on stored honey through winter — colony PERSISTS FOR YEARS.

🐝 Stinging Pest Species ID Quick Reference

Species

Social / Family

Nest & Key Feature

Paper wasp
Polistes spp.

SOCIAL; Vespidae

UMBRELLA-shaped single comb (NO envelope) attached to overhanging structure. Queens and workers SAME SIZE. Often near doorways without stinging. Attracted to fallen ripe fruit.

Aerial yellow jacket
Dolichovespula arenaria

SOCIAL; Vespidae

Aerial football-shaped paper nest, smaller and more round than other species, on building overhangs. Active March/April to end of July only. Canada + western and eastern US (NOT central/south).

Bald-faced hornet
Dolichovespula maculata

SOCIAL; Vespidae

BLACK AND WHITE (not yellow), LARGER than other yellow jackets. 4-6 wide circular combs in oval paper envelope. 400-700 workers. Kills other yellow jacket species for larval food. Low shrubs to high in trees or on buildings.

Common yellow jacket
Vespula vulgaris

SOCIAL; Vespidae

GROUND nester. Canada + northeastern US, higher elevations. Shady evergreen forests around parks and camps.

Eastern yellow jacket
Vespula maculifrons

SOCIAL; Vespidae

Ground nester (sometimes wall voids). Eastern half of US. Workers slightly smaller; colony 5,000+. Nest dark tan, partially decomposed wood, brittle. STINGER OFTEN STICKS in victim.

German yellow jacket
Vespula germanica

SOCIAL; Vespidae

VAST MAJORITY OF N. AMERICAN NESTS IN STRUCTURES (attics, wall voids). Strong light gray paper. Workers chew through walls. May remain active into November/December.

Honeybee
Apis mellifera

SOCIAL; Apidae

Wax combs side-by-side. Colony PERSISTS FOR YEARS on stored honey. Communicates via dances. Swarms when populations high — usually hollow trees, occasionally wall voids. Wall void colony = MAJOR problem (must remove nest after killing).

Carpenter bee
Xylocopa virginica

SOLITARY; Apidae

HAIRY YELLOW thorax + SHINY BLACK abdomen. Bores into wood (prefers UNPAINTED). Long tunnels with pollen + eggs. Males have NO STINGER (cannot sting); females rarely sting. New females reuse old tunnels.

Mud dauber wasps
Family Sphecidae

SOLITARY; Sphecidae

Slender shiny black/brown/orange/yellow with black markings; many have LONG THREAD-LIKE WAISTS. PARALYZE SPIDERS to provision mud cells. Mud nests in protected places (electric motors, sheds, attics, against siding, under porch ceilings).

Cicada killer
Family Sphecidae

SOLITARY; Sphecidae

More than 1 INCH long — "monster yellow jacket." Large yellow and black. Despite size, can be ignored — females rarely sting. Open soil burrows can be dusted individually if needed.

🎯 Treatment Approach by Nest Type

Nest Type

Approach

Special Notes

Paper wasp (umbrella comb)

Pressurized spray (8-12 ft propulsion) or aerosol on extension pole.

Remove old nests + scrape attachment point — new queens often select the same spot. Wear protective suit + veil if a ladder is needed.

Aerial yellow jacket / hornet nest

Treat after dark when workers are in nest. Insert tube in entrance hole, release pesticide 10-30 sec. Cut nest down + seal in plastic bag.

Pupae in capped cells may escape treatment and emerge later. Be especially cautious on ladders.

Ground yellow jacket nest

Insert plastic extension tube in entrance hole, release pesticide 10-30 sec. Plug entrance with DUSTED STEEL WOOL or COPPER GAUZE. Dust the plug + area.

Returning workers cue on entrance landmarks; they pull at the plug and pick up toxic dust. Any survivors inside also work at the dusted plug.

Wall void yellow jacket

Approach cautiously, stay out of flight pattern. WATCH FIRST — observe entry direction. Insert tube in observed direction; release 10-30 sec. Dust + plug entrance.

German yellow jacket may remain active into December. Care not to contaminate food surfaces.

Honeybee colony in wall void

Kill same way as yellow jackets in wall voids. Listen to bee noise from inside rooms to locate exact nest position. AFTER KILLING, REMOVE THE NEST.

If nest not removed: wax melts, honey flows down walls (PERMANENT STAIN — walls must be replaced); attracts robber bees + wasps + wax moths + carpet beetles. Caulk/repair entrance after removal.

Carpenter bee tunnel

Dust tunnels OR inject pressurized liquid insecticide. Insert DUSTED PLUG of steel wool or copper gauze. Fill opening with caulk, wood filler, or wooden dowel.

Dusted plug stops new adults that would otherwise emerge through shallow caulking. Caution on ladders; bees are relatively harmless.

Mud dauber nest

Aerosol contact sprays kill easily. Scrape away mud nests; cover problem areas with smooth paint.

Multiple wasps congregate at the same site, so removal/repaint can be expensive. Discourage nesting on porticos/high porches of historically important buildings.

Cicada killer burrow

Generally CAN BE IGNORED. If undue worry, dust open soil burrows individually.

Female killed when she returns to dusted burrow. Stings extremely uncommon.

💡 Memory Hooks

Honeybee removal rule: "Kill the bees, KEEP the nest in your wall? You'll be replacing the wall." Honey stain is permanent. Always remove the nest after treatment.

Stinger surprise: "Eastern yellow jacket leaves a stinger too." Honeybee isn't the only insect that can leave a barbed stinger in the victim.

Blood poisoning warning: "Yellow jackets visit manure — their stinger is a hypodermic." Anaerobic bacteria can be injected. Sting victims may need medical evaluation.

Bald-faced identity: "Black and white = bald-faced — and it's a yellow jacket, not a hornet." Common naming trap.

Social vs solitary aggression: "Many workers = aggressive; one female = harmless." Social colonies defend; solitary nesters don't.

Dust + plug pattern: "Treat the void, dust the plug, fill the hole." Standard sequence for ground yellow jackets, wall void colonies, and carpenter bee tunnels.

Vespid annual cycle: "Queen alone overwinters; whole colony dies; new nest each spring." Old nest never reused. Honeybees are the exception (year-round colony).

Ch.12: Stinging Pests

🎯 Top 5 Traps

🔢 Numbers You Must Know

🔀 Easily Confused

🐝 Stinging Pest Species ID Quick Reference

🎯 Treatment Approach by Nest Type

💡 Memory Hooks