Ornamental and Turf Pest Control
What this category covers
This category covers turfgrass, trees, shrubs, and other ornamental plantings on lawns, golf courses, parks, nurseries, and landscapes. Sites are close to people, pets, and pollinators, and the plants themselves are often the thing you can injure, so phytotoxicity and drift questions are common.
Concepts to master
- Pest identification first. Distinguish grassy weeds, broadleaf weeds, and sedges; distinguish insect damage from disease and from abiotic problems such as drought, compaction, or fertilizer burn.
- Preemergent timing. Preemergent herbicides must be down before weed seed germinates. A standard trigger is soil temperature at 1 to 2 inches reaching about 55 degrees F, often cued phenologically by forsythia in full bloom.
- Application form. Granular products need uniform coverage and, when the label allows, light irrigation to move the active ingredient into the zone; sprays need calibration to a per-1,000-square-foot rate.
- Phytotoxicity and drift. Growth-regulator herbicides can injure sensitive ornamentals and garden plants at very low doses. Check wind, volatility, and distance to sensitive plants.
- Pollinator protection. Do not apply insecticides to blooming plants or to turf with flowering weeds when bees are foraging.
- Resistance. Rotate fungicide groups and avoid repeated use of one mode of action on turf diseases.
Traps that show up in questions
Mowing immediately after a granular application, or mowing before and bagging clippings when the label requires clippings to be returned. Using a per-acre turf rate on a small bed. Treating a flowering shrub for aphids without regard to bees. Ignoring the plant-back interval when replanting into treated soil.
Rule of thumb with numbers
Size the job before you mix: a 5,000-square-foot lawn at a labeled 1.5 fl oz per 1,000 square feet needs 7.5 fl oz total. Calibrate the sprayer on a measured 1,000-square-foot strip with water first, then mix only what the calibrated output will cover.