Forest Pest Control
Forest pest control covers insects, diseases, weeds, and invasive plants in woodlands, plantations, windbreaks, and forest products. The exam tests pest identification, silvicultural integrated pest management, selective herbicides, application methods, drift and water protection, and safety in remote operations.
Core rules
- Diagnosis comes first: bark beetles, defoliators, root rots, oak wilt, and drought stress have different treatments; many forest problems are managed by sanitation or harvest, not spray.
- Silviculture is integrated pest management: thinning, species selection, slash management, and avoiding wounds reduce susceptibility.
- Forest herbicide methods include directed foliar, basal bark, cut-stump, and stem injection; each has label-specific carriers and rates.
- Protect streams, wetlands, vernal pools, and nontarget trees; use buffers and avoid inversions.
- Aerial applications require pilot and loader coordination, swath control, and drift management.
- Check for endangered species, bats, nests, and public access restrictions before treatment.
Worked example
A cut-stump label specifies a 25 percent volume-to-volume solution and 4 fl oz of mix per stump. You treat 200 stumps. Total mix is 200 times 4 = 800 fl oz = 6.25 gal. Product concentrate is 25 percent times 6.25 = 1.56 gal; carrier is 4.69 gal. Reasoning: first calculate finished mix, then apply the percent dilution to find concentrate. Treat freshly cut stumps so the cambium is exposed.
Traps
- Spraying defoliators after damage is done or without identifying the insect.
- Using a soil residual herbicide near sensitive roots or water.
- Treating stumps dry or missing the cambium ring.
- Ignoring basal-bark label limits on stem diameter, season, or oil carrier.