Abstract Rice was planted 22 May on loessial silt loam soil at the Macon Ridge Branch of the Northeast Research Station. The experimental design was a randomized complete block design with 4 replications. All plots were sampled for root feeding larvae by taking 3 soil cores (9 cm dia × 10 cm deep) from drills rows, once a week, for 4 weeks after establishing permanent flood. Cores were processed by washing through a #40 mesh sieve and floating the larvae out in a saline solution. Granular insecticides were applied by hand shaker to plots measuring 9 square meters. Preplant treatments were incorporated into the top 5 cm of soil with a rotary tiller. Preflood treatments were applied 1 day prior to permanent flood (18 Jun). Postflood treatments were applied 1 week after permanent flood (27 Jun). Plots were mechanically harvested and yields were converted to lb/acre at 12% moisture.