Agricultural Plant and Animal Pest Control
Scope
Agricultural plant and animal pest control covers field and vegetable crops, orchards, pastures, stored products, livestock and poultry, and the vertebrate pests around them. The exam expects integrated pest management: identify the pest, scout, compare counts with the economic threshold, choose the least-risk effective tactic, and evaluate the result. Know how mode-of-action groups work - HRAC for herbicides, IRAC for insecticides, FRAC for fungicides - because rotating groups is the standard resistance-management answer.
Application decisions
Be fluent in calibration, nozzle selection, carrier volume, adjuvants, and sprayer cleanout; carryover of 2,4-D or dicamba into a sensitive crop is a classic failure. Know the difference between preharvest interval (PHI) and restricted-entry interval (REI), and know that grazing, haying, and slaughter-withdrawal restrictions for treated forage and treated animals appear on the label. Animal treatments - pour-ons, ear tags, premise sprays, feed additives - must be labeled for that species and use. Residue violations follow directly from using a crop product on livestock or a livestock product at the wrong site.
Traps
The PHI/REI swap; treating a food animal with a product labeled only for the barn; ignoring pollinator statements during bloom; assuming a rate range means always use the top number; and forgetting that stored-product and premise treatments have their own label sites.
Rule of thumb
GPA = (GPM per nozzle x 594) / (mph x nozzle spacing in inches). Worked example: 1.35 GPM nozzles on 20-inch spacing at 4 mph deliver (1.35 x 594) / (4 x 20) = 10 gallons per acre. Confirm the per-acre product rate the label requires at that carrier volume.