Free Pest Control Exam Flashcards

IPM aims to keep pest populations below economically damaging levels, not to eradicate them. It combines biological, cultural, mechanical, and chemical controls so pesticide use is the last resort, not the first. The consequence is lower cost, fewer resistance problems, and reduced environmental harm.

The pest density at which control action should be taken to prevent the population from reaching the economic injury level. Treating below this point wastes money and needlessly exposes the environment; waiting above it allows unacceptable damage. It is not fixed, shifting with crop value, pest pressure, and growth stage.

The lowest pest population that causes crop damage worth more than the cost of controlling it. The economic threshold is set below the EIL so action triggers before damage outruns treatment. Understanding both keeps you from spraying too early or too late.

Using natural enemies (predators, parasites, parasitoids, or pathogens) to suppress pests. Broad-spectrum insecticides kill these allies along with the target, so biological control is usually scheduled before chemical and protected from spray drift. It is slow but self-sustaining once established.

Practices that make the environment unfavorable to pests: crop rotation, sanitation, resistant varieties, adjusted planting dates, and tillage. They cost little, leave no residue, and form the backbone of IPM. They fail only when pest pressure is overwhelming or rotations cannot break the pest life cycle.

Mechanical uses devices such as traps, mowers, and cultivators to kill or exclude pests; physical changes the environment with barriers, mulches, or temperature. Both bypass chemical residues entirely but are labor-intensive and impractical at field scale. IPM ranks them ahead of chemical because they preserve natural enemies.

Repeated use of one mode of action selects survivors that pass the resistant trait to offspring, eventually making the product useless. Rotating across different mode-of-action groups (not just active ingredients) and tank-mixing with a different mode of action slows this. Using the highest labeled rate is NOT rotation and accelerates resistance.

Four life stages (egg, larva, pupa, adult) where the immature form looks nothing like the adult, as in butterflies, beetles, and flies. Control must target the vulnerable stage: larvae feed and damage crops while adults mainly reproduce. Timing sprays to the vulnerable stage is what makes scouting calendars useful.

Three stages (egg, nymph, adult) where nymphs resemble miniature wingless adults, as in aphids, grasshoppers, and true bugs. Both nymphs and adults often feed on the same host, so a single well-timed spray can hit both. Nymphs are usually easier to kill because they lack the adult's hardened cuticle.

Annuals complete one life cycle per year from seed (crabgrass, pigweed) and must be controlled before they set seed. Biennials live two years (rosette then flowering stalk) so fall treatment of the rosette is key. Perennials (dandelion, bindweed) regrow from roots or rhizomes and need systemic herbicide translocation, not just mowing.

Misidentification wastes money, kills beneficials, and can worsen the problem by removing natural enemies. Many look-alikes need totally different chemistry, for example spider mites vs aphids. IPM formally requires identification before any action threshold is even calculated.

The Federal Insecticide, Fungicide, and Rodenticide Act is the primary U.S. federal pesticide law, administered by the EPA. It requires every pesticide sold or distributed in the U.S. to be registered and properly labeled. Use of any pesticide inconsistent with its label is a FIFRA violation.

Before any pesticide can be legally sold or distributed in the U.S., the EPA reviews health, environmental, and efficacy data and assigns a registration number that appears on the label. Products without a valid EPA registration number are illegal. The label is legally enforceable; deviations are FIFRA violations.

Products the EPA classifies as too risky for unrestricted use because they may cause unreasonable adverse effects even when used as directed. Only certified applicators (or persons under their direct supervision) may purchase and apply RUPs. The RUP classification statement appears prominently on the label.

Each state designates a lead agency, usually the Department of Agriculture, that administers FIFRA under EPA oversight, issues applicator certifications, and can set stricter rules than federal. Many state labels carry additional restrictions. Always follow whichever requirement is more restrictive, federal or state.

Federal rule requires applicators of RUPs to keep application records for at least two years; states may demand longer retention, more fields, or records for all pesticides. Records protect you in drift disputes and are auditable. Missing records can suspend certification and trigger fines.

Most states issue a certification only after you pass the Core exam (general safety, laws, environment) AND at least one category exam tied to the work you actually do, such as Agricultural 1A, Ornamental/Turf 3, or Structural 7. Core alone does not authorize you to work. Applying outside your certified category is a violation.

A liquid formulation in which the active ingredient is dissolved in a solvent plus an emulsifier, forming a milky emulsion when mixed with water. ECs penetrate waxy leaf cuticles well but the solvent can harm sensitive plants (phytotoxicity) and degrade rubber equipment parts. Easy to mix and measure but flammable.

A dry powder mixed into a suspension with water; the active ingredient sits on a solid carrier. WPs are less phytotoxic than ECs and cheaper to ship, but they settle fast and require constant agitation. Inhalation of the dust during mixing is a real exposure risk, so wear a dust/mist respirator and pour slowly.

Active ingredient coated on a clay or corn-cob granule, applied dry without water. Granules drift less than sprays and are simple to broadcast, but they need moisture to release the chemical and can attract birds or pets. Drop or rotary spreader calibration must be done for each product because granule density varies.

Active ingredient mixed with a food attractant that the pest eats. Baits use very little toxin per unit area, spare non-target organisms, and work best in IPM programs where selective control is desired. The catch: they must stay palatable. Moisture, mold, or contamination with other pesticides can ruin acceptance.

Soluble powders (SP) dissolve completely in water leaving no suspension, while soluble concentrates (S) are already liquid; neither needs agitation once mixed. Both are easy to handle and clean compared with WPs, but few actives are truly water-soluble, so the formulation list is limited.

Additives that improve how a spray behaves: surfactants reduce droplet surface tension for better coverage, stickers resist rain wash-off, and drift-control agents thicken the spray to reduce fine droplets. The label may specify particular adjuvant types; using the wrong one (for example oil with a WP) can inactivate the pesticide or burn foliage.

Flowables (F) are fine active ingredient suspended in liquid; they mix like ECs but behave like WPs and need some agitation. Microencapsulated (ME) products trap the active in polymer capsules for slow release, which lowers acute toxicity to the applicator and extends residual control. Both settle in the tank, so agitation is required.

Signal words rank acute toxicity. DANGER (often with POISON and skull-and-crossbones) is the highest; a few drops can be lethal. WARNING is moderate toxicity; CAUTION is the lowest category. The signal word dictates how carefully you handle, mix, and which PPE you need.

Specific instructions on hazards, required PPE, and first aid that are legally enforceable, not advice. The Precautionary Statements section combines human, environmental, and physical-chemical hazard warnings. Following them is your best defense against exposure and against FIFRA misuse charges.

The time after application during which unprotected workers may not enter the treated area; it ranges from 4 hours to several days and is printed under Agricultural Use Requirements. Only properly PPE-equipped or specially trained early-entry workers may enter during the REI. Posting the REI at the entry point is required on many farms.

The minimum days between the last pesticide application and harvest; it ensures residues stay below tolerance. The PHI differs for every crop and pesticide combination. Harvesting inside the PHI risks illegal residues and crop condemnation, so the label, not the calendar, sets the number.

Glove material must match the formulation. 14-mil or thicker nitrile is the standard for most pesticide mixing, but some solvents in ECs require butyl or Viton. Leather and cloth absorb pesticide and are not chemical-resistant. Replace gloves whenever contaminated, punctured, or degraded, and wash the outside before removal.

Labels specify respirator type: particulate (N95, R, or P100) for dusts and mists, organic-vapor cartridge for solvent-bearing formulations. A respirator only protects if it forms a seal; beards break the seal. Cartridges have a service life, so replace on schedule, when you smell solvent, or whenever breathing resistance changes.

Goggles, face shield, or safety glasses with side shields prevent splash and dust exposure during mixing. The label specifies the type; splash-proof goggles are required for DANGER and WARNING formulations. Eyewear is required during mixing and loading even when the spray application itself is in open air.

Long-sleeved shirt, long pants, or chemical-resistant coveralls prevent dermal contact, the largest exposure route. Coveralls worn over work clothes add a layer that can be removed and laundered separately. Never wash pesticide-contaminated clothing with the family wash; pre-rinse and run a separate cycle.

Don in the order gloves go on last so you can adjust other items without contaminating them; doff in reverse, peeling gloves inside-out and avoiding the contaminated outer surface. Wash hands and face immediately after doffing. Wrong doffing order transfers pesticide from the coveralls to your skin.

PPE traps body heat and moisture, raising the risk of heat exhaustion and heat stroke even in mild weather. Schedule the heaviest work for cooler hours, drink water frequently, and take shade breaks. Watch for cramps, dizziness, or stopped sweating as early signs that action is overdue.

The most common pesticide exposure route; skin absorbs many actives faster than the GI tract. Wet spray, mixing splash, and residue on clothing all contribute. Immediate 15-minute rinse with clean water is the standard first aid, and contaminated clothing must be removed before flushing.

Breathing spray mist, dust, or vapor, greatest during mixing of powders and ECs and in poorly ventilated spaces. Symptoms include headache, dizziness, nausea, and chest tightness. Move to fresh air immediately; a dust/mist respirator is the preventive control.

Swallowing pesticide, usually from eating, drinking, or smoking without first washing hands, or from storing product in food containers. Never induce vomiting unless the label or Poison Control explicitly directs it; corrosives do more damage coming back up. Call Poison Control and have the label in hand.

Every pesticide label has a specific first-aid section with the exact response for that product; follow it instead of general advice. Have the label (or a copy) with you when you call Poison Control or take a victim to the ER, because doctors treat by active ingredient. Speed matters more than completeness.

Hand-pumped knapsack sprayers are ideal for small areas, spot treatments, and uneven terrain. Calibration is by wand pace and nozzle pressure, so keep the pressure constant with frequent pumping. Agitate by shaking before and during use; WPs settle fast and clog the filter.

Engine- or PTO-driven sprayers deliver constant pressure and large volumes for broadcast treatments on bigger acreage. They need calibrated regulator settings, not just throttle position, to maintain even output. Nozzles must be matched to the intended droplet spectrum; more pressure does not mean better.

Flat-fan nozzles overlap for uniform broadcast coverage across the boom. Hollow-cone nozzles produce finer droplets for contact fungicide and insecticide coverage on foliage. Even-spray nozzles apply a single uniform band for banded or spot treatments and are not overlapped. Wrong nozzle choice means stripes, drift, or missed rows.

Spot treats apply pesticide only where the pest is, using far less product, sparing beneficials, and slowing resistance. Broadcast covers the whole area regardless of pest presence and is useful only when pressure is uniform. The label rate is stated for broadcast, so spot use must be calculated so the per-area rate does not exceed the labeled maximum.

GPA = (GPM x 5940) / (MPH x nozzle spacing in inches), where GPM is output per nozzle. Use this to convert measured nozzle output into per-acre application rate so the labeled dose is matched. Recalibrate any time you change nozzle, pressure, speed, or product.

At least once per season, plus after any nozzle change, repair, pressure-gauge replacement, or product switch. Nozzle output changes as tips wear; brass tips wear fastest, stainless steel slowest. A 10% drift in output means you over- or under-apply by 10%, costing money or causing illegal residues.

Larger droplets drift less but cover fewer sites on the leaf, which suits systemic herbicides. Smaller droplets cover better but drift farther in wind, which is acceptable for contact fungicides only in calm air. Nozzle type and pressure, not just wind, control droplet size; choosing a drift-reduction nozzle lets you spray in marginally higher wind.

Application rate (GPA) is inversely proportional to speed, so doubling the speed halves the rate per acre. This is why consistent speed is as critical as nozzle output. Use a speed the operator can hold across the whole field; rough terrain or turns that slow you down cause over-application in those passes.

Drift is off-target movement of spray particles or vapor. Reduce it by using larger-droplet nozzles, lowering boom height, avoiding winds above about 10 mph, and watching for temperature inversions that hold spray near the ground. Drift onto neighbors, sensitive crops, or water is the leading cause of applicator complaints and liability.

A treated-area setback from sensitive sites such as water bodies, schools, beehives, and organic fields. The label specifies the width; some labels require wider buffers when wind blows toward the sensitive site. Buffer zones protect water quality, pollinators, and neighboring land, and ignoring them is a label violation.

Mix and load away from wells (commonly at least 50 ft), use anti-backflow devices on water supply hoses, and never apply before forecast heavy rain. Spills at the mixing site are the most common groundwater contamination source. A backflow preventer is required by plumbing code in most states for good reason.

EPA may add Bulletins (via the Bulletins Live! Two system) that impose use limits where listed species or critical habitat occur. The label may reference a county-level Bulletin that applies only there. Check Bulletins Live! before each application because restrictions can change during the season and are legally enforceable like the label.