Abstract
Abstract Treatments were applied 27 Jul to plots 8 X 8 ft arranged in a RCBD, replicated 4 times. Granular materials were applied with a shaker jar. Liquid treatments were applied in 1 liter of water per plot with a sprinkling can. The plot area was irrigated after the last treatment had been applied with about ¼inch water using the golf course system. Water pH to apply was 6.85; to irrigate, about 8.0. Environmental conditions at start (8:30 am) and finish (9:35 am) of treatment applications were, respectively: air temperature, 23° C and 31.5° C; RH, 84% and 60%; overcast (fog) and clear (calm); soil temperatures (surface) 26° C and 32° C, (1 inch) 25.5° C and 29.5° C; soil moist from regular irrigation; soil type, loam; soil particle analysis, 40.7% sand, 46.6% silt, 12.7% clay; organic matter, 11.7%, pH 5.35; CEC, 23.81 meg/100 g; 1/3 bar, 31.29%. Thatch thickness ranged from 0.24 to 0.38 inches for 28 samples over plot area. Grub population was 100% Japanese beetle (pre- and post-treatment); avg no. grubs at treatment was 34.5/ft2 (59.4% mid to late 1st instar, 40.6% early 2nd instar). Efficacy was evaluated at 53 DAT using a cup changer to extract 4 plugs near the center of each plot to a depth of 2-3 inches and counting live larvae in each sample. The no. larvae for the 4 plugs from each plot was averaged to produce a mean for each replicate for statistical analysis.
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