Canadian Hemlock, Oriental/Asiatic Garden Beetle Grub Control, Long Island, Ny, 1984

Efficacy of selected turf insecticides was evaluated against Oriental/Asiatic garden beetle grub on Canadian hemlock trees growing in a commercial nursery. Experimental design consisted of treating 4 adjacent rows (ca 13.7 m) with ca 12 trees/row. Three check rows were established between treatments. All materials were liquids, premeasured in the laboratory, and applied with 3 gal of water per row through a watering can on 14 Aug. Materials were applied to the base of all trees. At treatment time the following environmental and soil conditions existed: air temperature, 83°F; soil temperature (1 inch), 79°F, (3 inch) 78°F; soil type, sandy loam; soil moisture, 1.11 (w/d); water pH, 5.7; and sunny. On 23 Sep, five trees were randomly selected from each of the center 2 rows/treatment. Trees from the center row were randomly selected for the control. Trees were dug up as if to be shipped. The soil on the roots and within a 6-inch radius was screened through a US Standard Sieve Series #6 wire mesh screen. Species identifications were determined in the laboratory.