Abstract Rice was planted in Crowley silt loam May 9 and flodded June 13. Three tests were each arranged in a randomized complete block design with 3 (Test 2) or 4 (Test 1 and 3) replications. Granular treatments (Test 1) were applied with a hand shaker just prior to flooding on June 13 to plots 3.5 x 15 ft. Spray treatments (Test 2) were applied 1 day preflood with CO2 powered sprayer except for Furadan 3G which was applied with a hand shaker. Plots were 6 x 15 ft. Plots in Test 3 were circular (5 ft dia). Each was surrounded by sheet aluminum flashing used as a levee to prevent water movement between plots. The 5 day postflood treatments were applied to the water surface on June 18. Cymbush, Pydrin and Ambush were each mixed with the hydrocarbon Exxon 5357-9. Plots in all tests were sampled for root-feeding rice water weevil larvae on July 8 and 9 by taking 5 soil cores (9 dia x 7 cm deep) from drill rows in each plot. The samples were processed by working each through a No. 40 U.S. Standard soil testing sieve and floating larvae out in brine.