Influence of a Surfactant on the Efficacy of Registered Insecticides for Control of Japanese Beetle and Northern Masked Chafer Larvae on a Golf Course Rough in Summit County, OHIO, 1995

The study was located on a golf course rough at Valley View Golf Course in Akron, Ohio. Applications were made 23 Aug to plots 8 X 10 ft (2.4 X 3.1 m) arranged in a RCB, replicated 4 times. The formulations were tank mixed with various concentrations of an organosilicone surfactant (OSS). Tank mixes were applied with a CO2 sprayer and TeeJet™ 8015 nozzles at 60 psi (4.22 kg/cm2) pressure that delivered a volume of 3 gal/1000 ft2 (1222 liter/ha). After all treatments were applied the area was irrigated with approximately 3/8 inch (1 cm) of water using the golf course system. Environmental conditions at the time of treatment were as follows: White grubs: approximately 25/ft2, 60% NMC 3rd instars, 40% JB 2nd and 3rd instars; Turf: level, dew, 2 inch (5 cm) ht, 30% bentgrass, 30% crabgrass, 20% annual bluegrass, and 20% Kentucky Bluegrass, 1/8 inch thatch; Soil: moist, 78°F at 1 inch (2.5 cm) and 80°F at 3 inch (7.6 cm); Weather: clear, 76°F, 0 -3 mph wind. Efficacy data taken 27 Sep (35 DAT) were based on the number of live larvae in six samples 7X7 inch (17.8 X 17.8 cm) in from each plot. Analysis of variance was done on plot total transformed to log (X+l) and means separated by LSD test at P = 0.05.