Japanese Beetle Grub Control on a Golf Course Fairway in Reading, Pa, 1982

Nine insecticides were applied Aug 18 for control of Japanese beetle grubs. The fairway consisted of Kentucky bluegrass (90%) and annual bluegrass (10%). Treatment plots were 10 × 10 ft, arranged in a randomized complete block design and replicated 3 times. Liquid formulations were applied in 3 gal of water with a hand-held sprinkling can. Granular formulations were applied with a hand-held shaker, followed by watering in with 3 gal water. After all treatments were completed, the entire area was irrigated for 20 min. At treatment time, the following environmental conditions existed: air temperature, 83°F; soil temperature, 58°F; soil type, clay-loam; soil pH, 5.9: percent organic matter, 2.4; soil condition „ moist; amount of thatch, 1.5 in; and skies were partly cloudy. Post-treatment counts were made 44 days later (Oct 1). Four ft2 sod samples were randomly taken from each replicate and the -total number of living Japanese beetle grubs was recorded for each ft2 sample. An average of 10 Japanese beetle grubs per ft2 was recorded Aug 18 prior to treatment.