AR Pesticide Applicator cheat sheet

IPM sequence: identify the pest, monitor with thresholds, prevent, then treat with the least-risk method; chemical control is a last resort, not a first step.

Economic threshold = pest density at which control cost equals crop loss avoided; economic injury level is the density where loss equals control cost.

Insect metamorphosis: complete (egg-larva-pupa-adult) includes beetles, moths, flies; incomplete (egg-nymph-adult) includes grasshoppers, aphids, true bugs.

Nymphs resemble adults but lack functional wings and reproductive organs; larvae of complete-metamorphosis insects look nothing like adults.

Weeds are grouped by life cycle (annual, biennial, perennial), by leaf shape (grass vs. broadleaf), and by emergence timing (summer vs. winter annual).

Plant pathogens spread by wind, water splash, soil, seed, insects, and equipment; fungi favor humidity, bacteria favor wet foliage, viruses need vectors or wounds.

Vertebrate pests are managed with exclusion, habitat modification, and repellents before toxicants; anticoagulant rodenticides carry secondary-poisoning risk to predators.

Degree-day models predict insect development: accumulate daily average temperature above a species-specific base threshold to time scouting and sprays.

Resistance management: rotate among IRAC/HRAC/WSSA mode-of-action groups and use labeled rates; sublethal rates accelerate selection.

The label is the law: use consistent with labeling is a legal requirement; off-label use is a violation under FIFRA.

Signal words rank toxicity: DANGER-POISON (oral LD50 <=50 mg/kg plus hazard), DANGER (corrosive/severe), WARNING (moderate), CAUTION (slight).

Restricted-entry interval (REI) is the minimum time after application before workers may enter without PPE; it appears on the label and in WPS materials.

Preharvest interval (PHI) is the minimum days between last application and harvest; violating it leaves illegal residues.

Section 24(c) allows a state to register a special local need; Section 18 allows emergency exemption for an unregistered use.

A restricted-use pesticide may be applied only by or under the direct supervision of a certified applicator, per the label.

Worker Protection Standard requires notification, PPE, decontamination supplies, and training for agricultural workers and handlers.

Recordkeeping: certified applicators must keep restricted-use application records for two years under federal rules; state rules may require more.

Pesticide registration review occurs at least every 15 years under FIFRA; a cancelled registration may have a labeled use-up period.

Formulation codes: EC (emulsifiable concentrate, solvent-based), WP/WDG (wettable powder/granule), SC (suspension concentrate), S or L (solution), G (granule), F (flowable).

Adjuvants: surfactants lower surface tension, stickers increase adhesion, spreaders increase coverage, and drift-control agents increase droplet size.

Carrier volume matters: ECs and oils in low water volumes can cause phytotoxicity; test on a small area first.

Compatibility jar test: mix products in the same order and ratio as the tank at a small scale and observe for flocculation, separation, or heat.

Tank-mix order rule: fill water, add compatibility agent if needed, then dry formulations (WP, WDG) before liquid formulations (EC, SC), then adjuvants last.

Active ingredient vs. acid equivalent: acid equivalent expresses the pesticidal portion; use it to compare products with different salt formulations.

A.i. per acre = (product rate per acre) x (percent a.i. in product / 100); check units before calculating.

Water quality affects performance: high pH causes alkaline hydrolysis of some insecticides (e.g., organophosphates); hard water reduces some herbicide activity.

Never mix different pesticides in the same container for storage; only mix in the spray tank at application time.

GPA = (ounces collected per nozzle) x (5940) / (nozzle spacing in inches x mph); use 5940 for US units.

Alternative calibration: GPA = (gallons used x 43560) / (area treated in square feet).

Nozzle flow varies with the square of pressure change: doubling pressure increases flow about 1.41 times, not 2 times.

Nozzle wear: replace when flow exceeds 10 percent above the new-nozzle rating for that size and pressure.

Drift control: larger droplets, lower pressure, lower boom height, drift-reduction nozzles, and higher carrier volume reduce off-target movement.

Spray overlap: flat-fan nozzles are typically spaced at half their spray width and operated at the height that gives proper overlap.

Boom height affects swath: raising the boom widens pattern and increases drift and coverage variability.

Granular applicators must be calibrated by weight per area, not volume, because granule density varies.

Clean equipment between crops and modes of action; rinse nozzles, screens, and tank three times and dispose of rinsate per label.

PPE selection follows the label's PPE section; the label may require more protection than the minimum, never less.

Signal words and toxicity: DANGER-POISON indicates highly toxic; use with extreme care and follow label first-aid directions.

First aid basics: move to fresh air for inhalation; flush skin/eyes with water for 15 minutes; for oral exposure, follow label and call poison control (1-800-222-1222).

Do not induce vomiting unless the label directs it; some formulations (petroleum distillates, corrosives) cause additional injury.

Cholinesterase-inhibiting insecticides (organophosphates, carbamates) cause SLUDGE symptoms; atropine is a medical treatment given by professionals.

Heat stress prevention: drink water, take breaks in shade, wear breathable PPE; heat illness can mimic pesticide poisoning.

Respirator fit: require fit testing, medical evaluation, and cartridge change schedules; a dust/mist filter does not protect against vapors.

Decontamination: remove contaminated clothing immediately, wash with soap and water, and launder work clothes separately from family laundry.

Sensitive individuals and children face higher risk; observe reentry intervals and posting requirements strictly.

Drift is influenced by droplet size, wind speed, temperature, humidity, boom height, and formulation; small droplets travel farther.

Temperature inversion: stable air with little mixing traps spray near the ground and can move it long distances; avoid spraying during inversions.

Groundwater contamination risk factors: sandy soils, shallow water tables, high application rates, and compounds with high water solubility and low soil adsorption.

Pesticide properties affecting leaching: water solubility (higher = more risk), soil half-life (longer = more risk), and Koc (lower = more risk).

Buffer zones and setbacks protect sensitive areas such as wells, streams, and endangered species habitats; check label and state rules.

Runoff control: avoid application before heavy rain, use vegetative filter strips, and incorporate soil-applied products when labeled.

Pollinator protection: avoid spraying blooming crops when bees are foraging, follow label bee warnings, and notify beekeepers when required.

Endangered species: check the label's endangered species section and Bulletins Live! Two for county-specific restrictions.

Dispose of rinsate on labeled sites; never dump into drains, ditches, or surface water.

Storage: keep pesticides in a locked, ventilated, dry area away from food, feed, seed, and livestock; post warning signs.

Store products in original labeled containers; never transfer to food or beverage containers.

Transport: secure containers, keep them upright, carry spill kit and label/SDS, and never transport pesticides in the passenger compartment.

Spill response: protect people, stop the source, contain with absorbent, and dispose of cleanup materials per label and state rules.

Triple rinse or pressure rinse empty containers, puncture them, and dispose through a state-approved container recycling program.

Excess or unwanted pesticides are disposed of through state collection programs or a licensed hazardous waste contractor; never pour down drains.

Container disposal: follow the label's container disposal instructions and state rules; burning is prohibited in most areas.

SDS (Safety Data Sheet) provides hazard, first-aid, and handling information; keep one for each product on site.

Inventory control: rotate stock, keep records of purchase and use, and store flammable products away from ignition sources.