Efficacy of Several Turf Insecticides Against Japanese Beetle Larvae, Golf Course Fairway, 1994

Abstract

Abstract Four different active ingredients were tested for efficacy against Japanese beetle larvae on a fairway at Stockbridge C.C., Stockbridge, MA. The fairway consisted primarily of creeping bentgrass (40%), annual bluegrass (25%), perennial ryegrass (10%), and Kentucky bluegrass (10%), and was mowed at ca. 0.8 inches. Treatment plots were 8 ft × 8 ft, replicated 5 times, in a CRB design. All applications were made between 11:00 AM and 12:15 PM, 16 Aug 94. Liquid formulations were applied by hand with watering cans, 3 liters water per plot. Granular formulations were applied using glass jars with perforated lids. Conditions at the time of application were as follows—75°F, sunny with light south wind (<5 mph), low humidity; soil type, silty loam. All plots were hand watered with 40 liters water immediately after the last materials were applied and received an additional 0.25 inch irrigation 1 hr after application. Nearly 1 inch of rain fell 36 hr after application. Product efficacy was evaluated on 19 Sep (34 DAT) by removing 5 cupcutter plugs (4.25 inch diam.) from near the center of each plot, dislodging soil with a hand trowel, and counting all grubs to a depth of 3 inches.