16.2 Categories 23, 25–27, 31, 41 (Forest, Seed, Aquatic, ROW, Public Health, Mosquito)

16.2 Categories 23, 25–27, 31, 41 (Forest, Seed, Aquatic, ROW, Public Health, Mosquito)

Quick Answer: These majors are still the second half of the sitting — 70% on the category paper, not a survey. 23 Forest tests cyclic pests, population dynamics, wildlife, and specialized equipment versus weather and adjacent land. 25 Seed tests coloration/labeling, germination/carriers, food/feed diversion, and unused-seed disposal. 26 Aquatic tests water-use situations, downstream effects, limited-area application, and fish/plants — and excludes public-health aquatic work (31). 27 Right-of-Way tests runoff, drift, excess foliage kill, herbicide containment, and adjacent communities on roads, power, rail, and pipeline. 31 Public Health is government vector-disease programs plus sanitation and drainage. 41 Mosquito is commercial control on residential, commercial, and public grounds, using life cycles/habitats and nonchemical drainage. Recert hours (Chapter 3): 10 for 31 and 41; 6 for 23, 25, 26, and 27.

Pick the category from the site and the employer, not from "there is water" or "there are bugs." A farm pond, a GDOT ditch, a DPH mosquito spray, and an HOA mosquito contract can look similar from the truck and sit in four different GDA numbers.

Category 23 — Forest Pest Control

Rule 40-21-2-.01(c) covers forests, forest nurseries, and forest seed producing areas. Georgia's commercial forest landscape is mostly loblolly and slash pine plantations across the Coastal Plain and Piedmont, plus hardwood bottoms, Christmas-tree farms, and nursery beds that ship seedlings statewide. Sites near the Okefenokee edge, the Altamaha corridor, or a hunting lease are still Category 23 when the target is forest pest control — they are also adjacent-land problems.

Rule 40-21-3-.01(b)(3) requires practical knowledge of those sites; the pests; cyclic occurrence of certain pests; population dynamics as a basis for programming pesticide applications; biotic agents and their vulnerability to the pesticides applied; control methods that minimize unintended effects on wildlife; and proper use of specialized equipment as it relates to meteorological factors and adjacent land use.

Cyclic pests and population dynamics. Southern pine beetle and some defoliators do not sit at a constant density. A Category 23 applicator programs treatments from trend, not from a calendar spray. Treating a pine stand "because last year was bad" without current population information fails the programming standard. Conversely, waiting until trees are already fading on a cyclic outbreak can miss the window when a treatment still protects adjacent stands.

Wildlife and biotic agents. Forest insecticides can kill predators and parasitoids that already suppress bark beetles or sawflies. Herbicides that strip understory change cover for turkey, deer, and songbirds. The competency standard is not "never treat." It is choose methods and timing that still control the pest while minimizing unintended wildlife effects — for example, avoiding broadcast sprays over a creek that feeds a farm pond on the next tract.

Specialized equipment versus weather and neighbors. Forest work uses airblast, mist blowers, injection, basal bark, and — if you also hold aerial add-on 34 — aircraft. Temperature inversions, wind toward a peach orchard or organic farm, and spray over a county road or power line are Category 23 equipment-and-meteorology items. Adjacent land use is part of the standard, not an optional courtesy.

Category 25 — Seed Treatment

Rule 40-21-2-.01(e) is commercial applicators using or supervising RUPs or state-restricted uses on seeds. Think south Georgia cotton and peanut seed, corn, soybeans, and vegetable seed moving through a conditioner — not a planter-box at the farm unless that person is the certified commercial treater.

Rule 40-21-3-.01(b)(5) requires practical knowledge of types of seeds commonly needing protection in the operational area; requirements for seed coloration and special labeling; carriers and surface-active agents that influence pesticide binding and may affect germination; hazards of handling, sorting, and mixing; potential misuse of treated seed such as introduction into food and feed channels; and proper methods for disposal of unused treated seed.

Coloration and labeling exist so treated seed is never mistaken for food or feed. Dye that has faded, bags without the treated-seed statement, or bins that also hold untreated grain for a mill are exam failures. Carriers and surfactants that help the pesticide stick can also reduce germination if the slurry is too hot, too wet, or incompatible. A treater who "gets more coverage" by doubling sticker and then ships dead cotton seed has failed the germination/carrier standard.

Food and feed diversion is the human-health trap. Leftover treated cotton or corn seed is not wildlife feed, not dairy rations, and not a way to recover cost at the elevator. Unused treated seed must be disposed of by a proper method — typically planting as labeled, returning per the registrant, or disposing as pesticide waste — not dumping in a ditch behind the Tifton plant. Handling hazards include dust, contaminated sorting tables, and mixing treated and untreated lots.

Category 26 — Aquatic Pest Control

Rule 40-21-2-.01(f) covers RUPs or state-restricted uses purposefully applied to standing or running water, excluding applicators engaged in public health related activities in category (i) — GDA Category 31. That exclusion is the first Aquatic exam trap. Treating a lake for hydrilla is 26. Treating the same water as a government mosquito or vector program is 31, not 26.

Rule 40-21-3-.01(b)(6) requires practical knowledge of various water-use situations and potential for downstream effects; secondary effects from improper rates, incorrect formulations, and faulty application; potential effects on plants, fish, birds, beneficial insects, and other organisms; and principles of limited-area application.

Georgia water uses stack on one pond: irrigation for pecans or peanuts, livestock watering, fishing, swimming, and sometimes a downstream drinking-water intake. A herbicide legal for a farm pond in Lee County can still be a disaster if the water is pumped onto vegetables the next morning or flows toward a neighbor's catfish ponds. Downstream effects include the Chattahoochee, Flint, Oconee, and reservoir chains such as Lake Lanier and Lake Allatoona — treat the hydrology, not the property line.

Limited-area application means you often treat a band, cove, or shoreline, not the entire lake, so dissolved oxygen crashes and fish kills stay contained. Over-rate, the wrong formulation (an emulsifiable concentrate that strips oxygen versus a labeled aquatic formulation), or a sloppy dump at the boat ramp are the secondary-effect items. Fish, nontarget plants, birds, and beneficial insects are named in the rule; "the weeds died" is not a complete answer.

Category 27 — Right-of-Way Pest Control

Rule 40-21-2-.01(g) covers public roads, electric power lines, pipelines, railway rights-of-way, and similar areas — GDOT roadsides, Georgia Power and EMC corridors, CSX and Norfolk Southern rail, and pipeline clearings such as petroleum products corridors across south Georgia.

Rule 40-21-3-.01(b)(7) requires practical knowledge of a wide variety of environments including waterways; problems from runoff, drift, and excessive foliage destruction; target pests; the nature of herbicides and the need for containment in the area applied; and impact on adjacent areas and communities.

ROW work crosses creeks, wetlands, school yards, organic farms, and cotton. Containment means the herbicide stays on the intended strip. Excess foliage kill is its own problem: stripping every plant on a cut slope causes erosion, visual complaints, and loss of wildlife cover. Drift from a summer application along I-75 or a power line through Houston County peach country is a community and phytotoxicity event. Target pests are usually weeds and brush that threaten pavement, sight distance, conductor clearance, or pipeline inspection — not every green plant in the county.

Category 31 — Public Health Pest Control

Rule 40-21-2-.01(i) is State, Federal, or other governmental employees using or supervising RUPs or state-restricted uses in public health programs for pests of medical and public health importance. This is a government-program category, not a private mosquito contract.

Rule 40-21-3-.01(b)(9) requires practical knowledge of vector-disease transmission as it influences pesticide application; life cycles and habitats as a basis for strategy against a wide variety of pests; environments from enclosed structures to streams; and non-chemical methods such as sanitation, drainage, and waste disposal.

Georgia public-health vectors include mosquitoes that can transmit West Nile virus and eastern equine encephalitis, plus other medically important pests in government programs. Strategy starts with habitat: dump standing water, drain, and sanitize before the truck rolls. A county environmental-health crew treating a tire pile and a blocked storm drain is using the nonchemical half of the standard. The pesticide application, when used, is timed to the life stage that actually transmits disease — not a calendar fog because residents called.

Category 41 — Commercial Mosquito Control

Rule 40-21-2-.01(r) (GDA 41) covers commercial applicators using or supervising restricted or state-restricted uses to control mosquitoes on residential, commercial, and public grounds. GDA's page also describes employees using or supervising pesticides to control mosquitoes and/or mosquito larvae on public and private grounds in Georgia.

Rule 40-21-3-.01(b)(13) requires practical knowledge of vector-disease transmission as it influences pesticide application; life cycles and habitats as a basis for mosquito strategy; breeding environments from outdoors to permanent and temporary bodies of water; and non-chemical methods such as sanitation, drainage, and waste disposal.

The overlap with 31 is real; the who and where differ. 31 is a government public-health program. 41 is commercial mosquito work on grounds — HOAs in coastal counties, municipal contracts that are not the public-health category, athletic fields, and private property. Both demand life-cycle thinking: eggs and larvae in containers, ditches, salt-marsh edges, and temporary floodwater versus adult fogging. Drainage and sanitation are still first. Fogging a Savannah-area subdivision every dusk without dumping containers fails the nonchemical standard even if the adulticide is labeled.

Do not put commercial mosquito work in 26 Aquatic just because larvae live in water. Aquatic excludes public-health related aquatic activities; mosquito grounds work is 41 (commercial) or 31 (government program).

Recertification hours belong in Chapter 3. Snapshot: 10 hours for 31 and 41; 6 hours for 23, 25, 26, and 27.

Competency map for this cluster

Exam traps for 23 / 25–27 / 31 / 41

• 26 excludes public-health aquatic work; that is 31, not a loophole to skip mosquito competency.
• 31 is governmental public-health programs. 41 is commercial mosquito grounds. Same insect, different category.
• Treated seed is never feed. Color and label exist to stop that diversion.
• Forest competency is cycles and wildlife, not "spray pine."
• ROW excess foliage kill is a named problem — bare dirt on a cut slope is not success.