Pest Identification and Control
This domain tests recognition of the region's major pests and the decision logic behind treating them: scouting, thresholds, resistance management, and matching tactics to life stage.
Integrated pest management logic
Identify first, then decide. Confirm the pest or disease, estimate the population with a consistent method (sweep net, drop cloth, soil sample, bait station), compare to the treatment threshold, and select the least disruptive effective tactic. Rotate mode-of-action groups - IRAC for insects, FRAC for fungicides, HRAC for herbicides - and never rely on one product season after season.
Louisiana pests worth knowing
- Rice: rice water weevil (larval root pruning), sheath blight.
- Soybean: redbanded stink bug, soybean rust.
- Sugarcane: sugarcane borer, West Indian canefly.
- Cotton: tarnished plant bug, bollworm.
- Turf and ornamentals: red imported fire ant, chinch bug, mole cricket, large patch.
- Structural: Formosan subterranean termite (established in south Louisiana), drywood termites.
- Invasive weeds and aquatics: water hyacinth, giant salvinia, hydrilla, Chinese tallow, cogongrass.
Diagnostics that steer product choice
Grasses, sedges, and broadleaves respond differently to herbicide families; sedges have triangular stems and three-ranked leaves. Termite swarmers have straight antennae and equal wings; ant swarmers have elbowed antennae. Fire ant mounds lack a central entry hole. Distinguish insect feeding injury from disease lesions or herbicide injury before spraying anything.
Worked example
A turf manager sees clumps with triangular stems, leaves in threes, and a whorl of bracts at the tip. Reasoning: triangular stem plus three-ranked leaves and a terminal whorl identify yellow nutsedge, not a grass. 2,4-D is weak on sedges, so a sedge-labeled herbicide applied to young, actively growing plants is the correct choice - and repeated applications may be needed because tubers survive.
Traps
Treating by calendar instead of scouting; repeating one mode of action until resistance appears; expecting bait to work while ants are inactive (baits need active foraging); treating a disease or a fertility problem as an insect issue.