ACE Prep · Glossary

ACE glossary

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ACE terms

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Arthropoda (Phylum): The animal phylum containing all insects, spiders, crustaceans, centipedes, and millipedes. Characterized by a hard exoskeleton, segmented body, and jointed legs.; In the fieldKnowing arthropod classes (Insecta, Arachnida, etc.) lets you quickly determine what you're dealing with and what control approach applies.
Chitin: The protein material that makes up the insect's exoskeleton. Covered with wax layers for waterproofing.; In the fieldDesiccant insecticides (diatomaceous earth, silica aerogel) work by disrupting the waxy chitin layer — knowing this helps you explain why they work in dry environments only.
Complete Metamorphosis (Holometabolous): Development through four distinct life stages: egg, larva, pupa, adult. The immature (larva) looks completely different from the adult. Examples: flies, beetles, butterflies, fleas, ants, bees.; In the fieldCritical for IGR selection — juvenile hormone analogs target larvae; chitin synthesis inhibitors target the pupal/molting stage.
Gradual Metamorphosis (Hemimetabolous): Development through three stages: egg, nymph, adult. Nymphs resemble small, wingless adults. Examples: cockroaches, termites, grasshoppers, true bugs.; In the fieldIn gradual metamorphosis pests, nymphs and adults often occupy the same harborage — control must target both.
Spiracle: External openings on the insect's thorax and abdomen through which air enters the tracheal breathing system.; In the fieldOils kill insects by clogging spiracles (physical mode of action). Fumigants enter pests through spiracles. This is why ventilation affects fumigant efficacy.
Petiole (Node): The narrow waist segment(s) between the ant thorax and abdomen (gaster). Number of nodes (1 or 2) is a primary ant identification character.; In the fieldOne node vs. two nodes is your first field key for ant identification — carpenter ants and odorous house ants have 1 node; fire ants and pharaoh ants have 2.
Integrated Pest Management (IPM): A decision-making process that uses multiple tactics — prevention, monitoring, biological, mechanical, and chemical controls — to manage pests at acceptable levels while minimizing risk.; In the fieldIPM is the professional standard. On the ACE exam, the IPM-correct answer starts with inspection/identification and selects the least disruptive effective tactic.
Action Threshold: The pest population level or damage severity at which control action becomes economically or medically justified. Does NOT mean zero tolerance.; In the fieldSetting appropriate thresholds helps explain to clients why one fly near an outdoor dumpster is different from one fly in a hospital OR.
Pest Triangle: A model showing that a pest problem requires three elements: a pest, a susceptible host/food source, and a favorable environment. Removing any side reduces the problem.; In the fieldWhen explaining IPM to clients, the pest triangle shows why exclusion, sanitation, and moisture control are as important as pesticide application.
Monitoring: Sampling pest activity over time to observe trends and changes. Differs from inspection (one-time) — monitoring tracks population changes using sticky traps, pheromone traps, light traps, and visual checks.; In the fieldMonitoring data justifies service and documents efficacy. In food plants, auditors expect to see monitoring records.
Good Manufacturing Practices (GMPs): FDA and USDA guidelines governing sanitation, facility maintenance, and pest control practices in food manufacturing and handling facilities.; In the fieldPest control contractors in food plants must operate within GMP requirements — violations can result in shutdown or lost audits.
Emulsifiable Concentrate (EC): A pesticide formulation where an oil-based active ingredient is combined with emulsifiers and solvents to mix with water. Forms a milky solution. Fast knockdown, easily absorbed through skin and porous surfaces, minimal residual on brick/concrete.; In the fieldECs work well for rapid knockdown on non-porous surfaces but are not the best choice for long-term residual on porous exterior surfaces like brick.
Suspension Concentrate (SC / Flowable): A pesticide where finely ground solid particles are suspended in a liquid carrier. Requires agitation. Better residual than EC on porous surfaces, less skin absorption. Examples: Suspend SC, Talstar, Tempo.; In the fieldSCs are a workhorse formulation for perimeter and crack-and-crevice applications where residual matters more than knockdown speed.
Microencapsulated (CS / ME): Active ingredient encased in slow-release polymer micro-capsules suspended in liquid. Best residual of liquid formulations, lower exposure risk, readily picked up by insects. Requires agitation, more expensive. Examples: Demand CS, Cykick CS.; In the fieldIdeal for accounts requiring extended residual with lower exposure risk (schools, daycares). The capsule size can be picked up and transferred by crawling insects.
LD50 (Lethal Dose 50): The amount of a substance (in mg/kg body weight) that kills 50% of a test population in a single dose. Lower LD50 = more acutely toxic.; In the fieldThe basis for EPA toxicity classification and signal words. Helps choose between products of similar efficacy when safety is the priority.
Signal Word: Required label word indicating relative acute hazard: DANGER-POISON (Class I, most toxic), WARNING (Class II), CAUTION (Class III & IV, least toxic).; In the fieldFirst thing to check on any new product label. Guides PPE selection and customer communication about treatment safety.
Pyrethroid: Synthetic insecticides modeled after natural pyrethrins. Act on insect sodium channels — not cholinesterase. Mammals are much less sensitive than insects. Bind tightly to soil. Examples: bifenthrin, cypermethrin, permethrin, lambda-cyhalothrin.; In the fieldMost common class in structural pest control. Resistance is a documented issue in German cockroaches and bed bugs — rotation with other classes is important.
Organophosphate (OP): Insecticide class that irreversibly inhibits acetylcholinesterase, causing nerve stimulation. Higher mammalian toxicity than pyrethroids. Examples: malathion, chlorpyrifos, acephate.; In the fieldRarely used in structural pest control today due to toxicity and restrictions. Know that OPs = irreversible cholinesterase inhibition for the exam.
Neonicotinoid (Chloronicotinyl): Insecticide class that mimics acetylcholine at nicotinic nerve receptors. Water-soluble, systemic in plants. Examples: imidacloprid (Premise), acetamiprid (Transport).; In the fieldUsed in termite treatments (imidacloprid/Premise) and some ant baits. Moderate selectivity — lower impact on beneficial insects in structural applications vs. soil applications.
Fipronil (Phenyl Pyrazole): Insecticide that blocks GABA-regulated chloride channels. Long residual in soil (KOC 750). Non-repellent transfer effect. Examples: Termidor, Regent, MaxForce products.; In the fieldThe gold standard for subterranean termite liquid treatment. Transfer effect means termites that contact treated soil carry it back to the colony.
Insect Growth Regulator (IGR): Pesticides that disrupt insect development. Two types: (1) juvenile hormone mimics (fenoxycarb, methoprene, pyriproxyfen) — disrupt adult transformation and reproduction; (2) chitin synthesis inhibitors (noviflumuron, novaluron) — prevent cuticle formation during molting.; In the fieldIGRs do not kill adults directly — they break the reproductive cycle. Best used in combination with adulticides for faster knockdown.
Ootheca: The egg capsule produced by cockroaches. Number of segments, size, and color help identify cockroach species. German ootheca: 15–20 segments, 30–40 eggs. Oriental: 16 eggs. American: 14 eggs.; In the fieldFinding and counting ootheca tells you species ID and infestation severity. German cockroach ootheca carried by the female until 1–2 days before hatch.
Coprophagy: Feeding on feces. Early-instar German cockroach nymphs feed on the feces of older cockroaches to obtain essential nutrients and gut microbes.; In the fieldCoprophagy means bait placed near existing feces competes with an established food source. Remove feces before baiting when possible.
Budding (Ant Colony Fragmentation): A reproductive strategy in some ant species (notably pharaoh ants, odorous house ants) where a portion of the colony — including workers, brood, and one or more queens — splits off to form a new satellite colony when stressed.; In the fieldUsing repellent sprays on pharaoh ants causes budding. Bait-only programs avoid this. Always ID the ant species before selecting a control method.
Trophallaxis: Food sharing between colony members — often mouth-to-mouth. Critical for termites (sharing gut protozoa with nymphs) and ants (distributing liquid bait through the colony).; In the fieldTrophallaxis is why slow-acting ant baits (low-concentration AI) work better than fast knockdown — bait is shared with the queen before workers die.
Frass: Insect excrement or wood powder expelled from boring insects. Characteristics differ by species: drywood termite frass = hard hexagonal pellets; carpenter ant frass = sawdust + insect parts + pupal cases; powderpost beetle frass = fine silky powder.; In the fieldFrass ID is one of the most important WDO inspection skills — the appearance, texture, and location of frass points directly to the pest species.
Subterranean Termite: Termites that must maintain contact with soil to survive. Live in underground colonies and build mud tubes to reach above-ground wood. Most common US species: Reticulitermes flavipes (eastern). Largest colonies: Coptotermes formosanus (Formosan).; In the fieldMud tubes are the primary field sign. Liquid barrier treatments (non-repellent, transfer-effect products like fipronil) and bait systems are the main control approaches.
Drywood Termite: Termites that require no soil contact. Live entirely within the wood they infest. Need wood moisture <15%. Produce hard, hexagonal, dry fecal pellets that are kicked out of galleries. Family Kalotermitidae.; In the fieldTent fumigation is often the only way to treat an entire structure for drywood termites. Localized treatments (borate injection, heat, microwaving) can work for limited infestations.
Flea Allergy Dermatitis (FAD): An allergic reaction to flea saliva that causes intense, prolonged itching and skin irritation in sensitized pets and humans. Even a single flea bite can trigger severe FAD in sensitized animals.; In the fieldFAD clients need aggressive flea control — on pet, in environment, and outdoors. A sensitized pet will react to one bite long after the flea population is reduced.
Necrotic Venom: Venom that destroys tissue at and around the bite site, causing a spreading wound. Associated with brown recluse spider (Loxosceles reclusa) and some sac spiders.; In the fieldBrown recluse is common in central/southern US. If clients describe a progressively worsening wound, recommend medical evaluation — not just a callback.
Lyme Disease: A bacterial infection (Borrelia burgdorferi) transmitted by the black-legged deer tick (Ixodes scapularis). Symptoms include bull's-eye rash, fatigue, joint pain. Most common vector-borne disease in the US.; In the fieldTick programs in the northeast and midwest should focus on deer tick habitat. Know which tick vectors which disease for the ACE exam.

Stored product pests

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Internal Feeders: Pests whose larvae develop within the kernel of a whole grain or seed.; In the fieldKey ID distinction — if you see round exit holes in whole kernels, suspect an internal feeder like rice weevil or Angoumois grain moth.
Scavengers: Stored product pests that only attack grains already processed or damaged by other insects.; In the fieldSawtoothed grain beetle is a classic scavenger. Their presence often indicates a pre-existing infestation of a primary pest.
Secondary Pests: Pests that infest products that are moldy or already out of condition.; In the fieldForeign grain beetle is a secondary pest attracted to mold. Finding them often points to a moisture or sanitation issue, not just a pest problem.
External Feeders: Larvae develop outside kernels and can feed on both whole and processed grains.; In the fieldIndian meal moth and Mediterranean flour moth are external feeders. They spin silk webbing over their food substrate — look for webbing in flour, cereals, and pet food.
Elytra: The hardened forewings of a beetle that protect the hind wings and abdomen.; In the fieldElytra characteristics (striations, patterns, color markings) are primary ID features for stored product beetles — always examine under a hand lens.
Striations: Longitudinal lines or ridges found on the elytra of beetles.; In the fieldDrugstore beetle has distinct longitudinal grooves (striations); cigarette beetle does not. This is the fastest field ID to separate the two.
Pronotum: The section of the beetle's thorax immediately behind the head.; In the fieldSawtoothed grain beetle has 6 saw-like projections on the pronotum — a definitive field ID character. Foreign grain beetle has notches in a square pronotum.
Serrate Antennae: Antennae with a saw-toothed appearance. Example: Cigarette beetle antennae.; In the fieldSerrate antennae = cigarette beetle. Drugstore beetle has a 3-segmented club instead. Antenna type is a key separation character for these two common pests.
Beadlike (Moniliform) Antennae: Antennae with segments that resemble a string of beads.; In the fieldFound on confused flour beetle. Antenna shape helps distinguish flour beetles from other small brown beetles.
Gradual vs. Abrupt Clubbed Antennae: Gradual: segments increase in size slowly toward the tip. Abrupt: club forms suddenly from similarly sized segments.; In the fieldRed flour beetle has an abrupt 3-segmented club; confused flour beetle has a gradual 4-segmented club. This is the primary field separation between the two species.
Hide & Larder Beetle Habitat: Hide and larder beetles feed on trophies or skins and are commonly found in museums.; In the fieldMuseum pest management is a specialty account. Any account with taxidermy, hides, or mounted specimens is at risk. Dermestids can devastate irreplaceable collections.
Plant Protein Stored Products: Dried vegetables, fruits, and nuts are examples of products containing plant proteins commonly infested by stored product pests.; In the fieldExpand inspections beyond grain bins and flour sacks. Bird seed, dried fruit, decorative gourds, and nut bowls are all common infestation sources missed in callbacks.
Farinaceous Products: Products primarily composed of grains — flour, meal, starch-based foods.; In the fieldMediterranean flour moth is the signature farinaceous pest in mills. Sawtoothed grain beetle and red/confused flour beetles follow closely in processed grain facilities.
Dermestid Beetles (Family Dermestidae): Often identified by an oval shape, short clubbed antennae, and patterned scales. Includes warehouse beetle, khapra beetle, carpet beetles, and hide beetles.; In the fieldDermestids are among the most destructive stored product pests and are also major museum and structural pests. Species ID within the family drives control strategy.
Rice Weevil (Sitophilus oryzae): 2–3 mm. Attracted to lights and capable of flight. Distinguished from granary weevil by lighter X-shaped markings on wing covers.; In the fieldFlight capability makes rice weevil a more mobile infestation risk than granary weevil. Look for X markings on elytra — your fastest field ID.
Granary Weevil (Sitophilus granarius): Internal feeder on whole corn, wheat, barley, and rice. Cannot fly. Thoracic pits are oval and widely spaced (vs. round and closely spaced in rice weevil).; In the fieldCannot fly, so infestations are more contained. Thoracic pit shape is the microscopic ID character separating it from rice weevil when the X marking isn't clear.
Bean/Pea Weevils (subfamily Bruchinae): Lack the long proboscis (snout) of true weevils. Leave round exit holes on infested beans.; In the fieldRound exit holes in beans or peas = bruchid weevil. No snout distinguishes them from curculionid weevils. Common in imported dry beans and bird seed.
Angoumois Grain Moth (Sitotroga cerealella): Internal feeder. Wingspan 13 mm, yellowish-white wings. Commonly infests barley, rye, corn, oats, and rice as whole grain crops.; In the fieldOnly moth that is a true internal feeder on whole grains. Can be confused with clothes moths — check for the tuft of hair between the eyes on clothes moths (Angoumois lacks it).
Drugstore Beetle (Stegobium paniceum): Distinguished from cigarette beetle by rows of longitudinal grooves on elytra. Antenna has a loose 3-segmented club.; In the fieldWill eat almost anything — including prescription drugs, books, and leather. Grooved elytra = drugstore. Smooth elytra = cigarette. Check antennae to confirm.
Cigarette Beetle (Lasioderma serricorne): Serrate antennae (no club), smooth elytra with no longitudinal grooves. Life cycle 30–50 days.; In the fieldCommon in tobacco, spices, dried herbs, and dried floral arrangements. Fast life cycle means populations build quickly. Smooth elytra + serrate antennae = cigarette.
Trogoderma (Warehouse & Khapra Beetles): Genus of Dermestids including warehouse beetle (Trogoderma variabile) and khapra beetle (T. granarium, a quarantine species). Brownish-black with mottled elytra patterns.; In the fieldKhapra beetle is a quarantine pest — report any suspected ID to state ag department. Warehouse beetle larvae have hastisetae (irritating hairs) and are persistent grain pests.
Urogomphi: The two terminal horns found on the larva of hide beetles (Dermestes spp.).; In the fieldUrogomphi are a definitive larval ID character for hide beetles. A 12 mm, hairy larva with two small hooks at the tail end = hide beetle.
Hastisetae: Specialized, irritating hairs found on the larvae of Trogoderma and Anthrenus species. Can cause gastrointestinal irritation if consumed.; In the fieldHastisetae in food products is a health risk. Any confirmed dermestid larval contamination of a food product warrants removal and disposal, not just treatment.
Varied Carpet Beetle (Anthrenus verbasci): Small (3 mm) and covered with colorful scales. Larvae feed on animal protein products.; In the fieldFeeds on wool, silk, feathers, dried insects, and animal-based food products. Scales are diagnostic — look for small round beetles with a mottled pattern of white, brown, and yellow scales.
Indian Meal Moth (Plodia interpunctella): Reddish copper color on outer 1/3 to 1/2 of front wings. Wingspan 18 mm. Larvae feed on candy, dried peppers, pet food, and cereals. Silk webbing is a key sign.; In the fieldMost common stored product moth in retail and household accounts. Silk webbing in cereals or pet food = IMM first. Pheromone traps are essential for monitoring.
Mediterranean Flour Moth (Ephestia kuehniella): Larger than IMM (25 mm wingspan). Pale gray forewings with transverse black wavy bars and dirty white hind wings. External feeder and silk spinner. Nocturnal and attracted to lights.; In the fieldSignature pest of flour mills. The silk webbing clogs milling machinery. Nocturnal habit means UV light traps are especially useful for monitoring in mills.
Sawtoothed Grain Beetle: Named for 6 saw-like projections on each side of the thorax. Cannot fly. Scavenger — infests processed and damaged grain products.; In the fieldCannot fly, so infestations spread through product movement. Sawtoothed projections on thorax are unmistakable with a hand lens. Common in grocery store and warehouse accounts.
Red vs. Confused Flour Beetle: Red flour beetle (Tribolium castaneum): more common in south, CAN fly, abrupt 3-segmented club. Confused flour beetle (T. confusum): cannot fly, gradual 4-segmented club.; In the fieldFlight capability matters for spread risk. Both produce quinones that cause off-flavor in infested grain. Antenna club segments (3 abrupt vs. 4 gradual) is the definitive ID character.
Flour Beetle vs. Lyctid Powderpost Beetle Eye Comparison: Flour beetles have wrap-around eyes; Lyctid powderpost beetles have globular eyes. Tarsal formula: flour beetle = 5-5-4; Lyctid = 4-4-4.; In the fieldWrap-around vs. globular eyes and tarsal formula are microscopic characters needed to separate stored product beetles from wood-boring beetles — important for correct diagnosis and treatment.
Spider Beetles (Subfamily Ptininae): Characterized by a spider-like appearance and tolerance for extreme desiccation. Scavengers of grains, nuts, animal skins, and rodent excrement.; In the fieldOften found in rodent and bird nests. Presence of spider beetles in a structure can indicate an active rodent or bird nest problem nearby — inspect for both.
Mealworms (Tenebrio spp.): Larvae used as fish bait and pet food. Life cycle over 365 days — the longest of common stored product pests.; In the fieldVery long life cycle means control can take months. Found in grain bins, animal feed, and poultry operations. Dark mealworm larvae are darker in color than yellow mealworm larvae.
Foreign Grain Beetle (Ahasverus advena): Tiny (2 mm), reddish-brown. Secondary pest that feeds on molds and mildews. Often found in new construction due to mold in green lumber. Notches in square pronotum.; In the fieldCommon in new housing — clients mistake it for a primary grain pest. The real issue is mold in green lumber or wet drywall. Fix the moisture source; the beetles will disappear.
Heat Treatment for Stored Products: 120°F for 60 minutes kills all insect life stages in stored products.; In the fieldHeat is a chemical-free option for treating food products. Must maintain 120°F throughout the product mass — not just the air temperature. Works well for grain bins and empty facilities.
Cold Treatment for Stored Products: -4°F for 7–14 days kills the hardiest pest life stages in stored products.; In the fieldSmall infested items (bird seed, decorative gourds, spice containers) can be bagged and frozen. 7 days minimum; 14 days for certainty. Rapid temperature drop is most effective.
Pheromone Traps in Stored Product Pest Management: Attract males to traps to identify infestation levels. Primary monitoring tool — not a standalone control.; In the fieldPlace pheromone traps at regular intervals in warehouses and retail. High trap counts point to the infestation source. Traps confirm species ID and measure population trends over time.
Four Key Elements of Stored Product Pest Control: Education, Inspection, Sanitation, and Physical/Chemical control.; In the fieldThe ACE exam expects you to prioritize in order — education and inspection first, then sanitation, then control. Skipping inspection or sanitation and going straight to chemicals is wrong answer territory.
Stock Rotation (FIFO): Rotation of goods ensures older stock is used first, preventing long-term infestation development.; In the fieldFirst-in, first-out (FIFO) is the standard recommendation for any food storage account. Inspectors should verify stock rotation compliance — products sitting for 6+ months are high risk.
Unusual Stored Product Pest Infestation Sources: Organic fertilizers, old rodent baits, and bird nests are three unusual places to check beyond the pantry.; In the fieldCallbacks with no apparent food source should trigger an expanded inspection. Old rodent bait blocks and bird nests in attics or vents are frequently overlooked infestation sources.
Clothes Moth vs. Angoumois Grain Moth: Clothes moths are smaller and have a tuft of hair between the eyes. Angoumois grain moth lacks this tuft.; In the fieldBoth are small, golden/yellowish moths easily confused in the field. Hair tuft between eyes = clothes moth = wool/fiber pest. No tuft = Angoumois = whole grain internal feeder.
Proboscis (Weevil Snout): The elongated snout of weevils (Curculionidae) used to bore into grain kernels for feeding and egg laying.; In the fieldLong proboscis = true weevil (Curculionidae). Short or absent snout = bruchid (bean/pea weevils). The snout length is your fastest family-level field ID for weevils.
Exclusion in Stored Product Pest Management: Sealing entry points to prevent pests from entering a facility.; In the fieldDoor sweeps, loading dock seals, and proper container storage with tight-fitting lids are all exclusion strategies. Essential in food processing facilities to prevent re-infestation.
Lamellate Antennae: Antennae characterized by plate-like segments stacked together, like a fan. Common in scarab beetles.; In the fieldLamellate antennae are found on scarab beetles — not typical stored product pests, but the ACE exam tests antenna types across orders.
Pectinate Antennae: Antennae with long, thin processes on one or both sides, resembling a comb.; In the fieldComb-like antenna = pectinate. Found in some cerambycid beetles. The ACE exam expects you to distinguish pectinate from serrate (cigarette beetle) and lamellate (scarabs).
Sanitation in Stored Product Control: Cleaning up spilled food products to eliminate breeding sites. Core element of any warehouse or food facility pest management program.; In the fieldSanitation is the most important non-chemical control. Vacuum-cleaning cracks and crevices in grain storage areas, removing old product residue, and fixing leaks eliminates the harborage that makes chemical treatments last.

ACE glossary

ACE terms

Stored product pests

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