Forest Pest Control
What this category covers
Forest pest control includes site preparation, conifer release and herbaceous weed control, insect and disease suppression on commercial and public forest land, and protection of individual high-value trees. Applications are often aerial, over large blocks, and near water, so drift and buffer management drive most exam questions.
Concepts to master
- Application systems. Aerial (fixed-wing, helicopter), ground skidder-mounted booms, backpack and directed spray, stem injection, soil drench, and trunk injection for individual trees.
- Insect tactics. Bacillus thuringiensis var. kurstaki for leaf-feeding caterpillars, mating disruption and semiochemicals for bark beetles and moths, and timely treatment based on degree-day or pheromone-trap data.
- Block layout and flagging. Spray blocks are defined by GPS or flagging; buffers, stream setbacks, and label water set-asides must be laid out before the aircraft arrives.
- Weather and droplet size. Fine droplets plus wind or a temperature inversion equal off-target movement over a very long distance. Volumetric mean diameter and evaporation matter in hot, dry air.
- Workers and the public. Forest worker REIs, notification of adjacent landowners, road and trail closures, and restrictions tied to threatened or endangered species such as bats.
Traps that show up in questions
Borrowing an agricultural rate or carrier volume for an aerial forest job. Forgetting that a stream crossing or pond inside the block still requires the full label buffer. Treating a public forest without the required notice. Assuming the REI closes the entire forest to everyone.
Rule of thumb with numbers
If the label requires a 100-foot buffer from surface water and a block edge sits 40 feet from a creek, do not "split the difference." Pull the spray line back so the treated edge is at least 100 feet from the water and re-flag the block.