Pesticide Selection, Formulations, Labels, and Mode of Action
Domain 3 tests selecting a legal, effective product and understanding formulation, label, and mode of action. The label is the legal document: site, rate, PPE, restricted-entry interval (REI), and resistance-management language all matter. Florida also has 24(c) special local need labels and Section 18 emergency exemptions that are product- and situation-specific.
Read the label in order
Site and pest first; then rate and timing; then formulation and PPE; then REI, storage, and disposal. Signal words reflect acute toxicity: Danger (highly toxic), Warning (moderately toxic), Caution (slightly toxic). Check the EPA registration number and state registration. A 2(ee) recommendation can add a pest not on the label but cannot add a site.
Formulations
Emulsifiable concentrates (EC) use solvents, can be phytotoxic, and need agitation. Wettable powders (WP) and water-dispersible granules (WDG) leave visible residue and require good agitation. Suspension concentrates (SC) are easy to mix. Soluble liquids (SL) dissolve clear. Granules are low-drift and useful for soil pests but can move off-site. Baits target mole crickets and ants. Microencapsulated products have longer residual and higher bee risk. Choose based on site, equipment, plant sensitivity, and drift risk.
Mode of action
Learn IRAC, FRAC, and HRAC groups. Pyrethroids are 3A; neonicotinoids 4A; organophosphates 1B; carbamates 1A; spinosyns 5; Bt 11A; diamides 28; fipronil 2B. Fungicides: QoI 11, DMI 3, SDHI 7, MBC 1, chlorothalonil M5, phosphonates 33. Herbicides: 2,4-D group 4, glyphosate 9, prodiamine 3, atrazine 5. Rotate groups, not just brand names.
Worked example
A 40% WP label lists 0.25 lb active ingredient per acre for chinch bug. You treat 5,000 sq ft. 5,000 ÷ 43,560 = 0.115 acre; 0.115 × 0.25 = 0.0287 lb ai; ÷ 0.40 = 0.0718 lb product; × 16 = 1.15 oz. That is the amount to weigh, not a guess from the jug.
Traps that cost marks
Do not tank-mix two products with the same MOA and call it rotation. Do not assume a 24(c) label applies statewide or to every site. Do not ignore REI or phytotoxicity warnings. Do not use a product on a site not listed.