Postemergence herbicide control of winter broadleaved weeds in turf

摘要

A small plot field experiment was conducted on the San Marcos Golf Course in Chandler, AZ in an out-of-play rough area. A second small plot field experiment was conducted in the City of Phoenix Japanese Friendship Garden in a landscaped turf area witha mix of bermudagrass overseeded with perennial ryegrass and cultivars of fescues. At both locations, the treatment plots measured 5 ft by 10 ft and each treatment was replicated three times in a randomized complete block design. Herbicides were appliedwith a CO2 backpack sprayer equipped with a hand-held boom with 3 flat fan 8002VS nozzles spaced 20 inches apart. The sprays were applied in 31 gpa water pressurized to 50 psi. In Chandler, the chickweed (Stellaria media) measured 3 to 8 inches across in diameter. Additional weeds in the plot included London rocket (Sisymbrium irio) that was 3 to 12 inches in height and flowering, and few shepherdspurse (Capsella bursa-pastoris) at 4 to 6 inches. The herbicides were applied in Chandler on 02 March 2016when the temperature was 61°F, clear sky, calm air, and soil temperature was 56°F. In Phoenix, the chickweed was maturing and started flowering on 28 March 2016 when the air temperature was 84°F, clear sky, no wind, and moist soil was 60°F. Weed control ratings were conducted at regular intervals following the applications and statistically analyzed.