Abstract
Abstract Rice was planted in Crowley silt loam at the Rice Research and Extension Center in Stuttgart, AR; ‘Lebonnet’ was planted on 14 May for the first two tests and ‘Bond’ on 21 Jim for the third. Plots for the first preflood test were 6 ft x 15 ft; all other plots were 5-ft dia and surrounded by aluminum flashing to prevent water movement among plots. Each test was arranged in a randomized complete block design with 3 replications. Granular insecticides were applied with a hand shaker; all other formulations were applied with a single nozzle air powered sprayer delivering 40 gpa. Those applied with oil were mixed in Agri-dex with 0.2% Ortho X-77. All plots were sampled for root-feeding larvae 19-21 days after flood by taking 5 soil cores (9 cm dia x 7 cm deep) from the drill rows of each plot; they were processed by washing through a no. 40 U.S. Standard testing sieve and floating the larvae out in brine.
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