Control of Rice Water Weevil with a Seed Treatment, 1991:

Abstract

Two rates of NTN 33893 as a seed treatment were compared with carbofuran (Furadan 3 G) and an untreated check for control of RWW. The experimental design was a RCB with 4 replications. Plot size was 9 rows with 17.8 cm spacing X 4.88 m. Rice was drill-seeded at 123 kg seed/ha 13 May and emerged 19 May. Propanil and thiobencarb at 2.24 kg (AI)/ha each were applied 29 May for week control. Plots were temporarily flooded (flushed) 23 May and permanently flooded 4 Jun. Urea, 151.2 kg/ha, was applied in a 3-way split of 84 kg/ha on 4 Jun and 33.6 kg/ha on 10 and 22 Jul. Carbofuran was applied with a hand shaker 12 Jun. On 26 Jun and 3 Jul five 10.2 x 10.2 cm (diam by depth) soil cores were removed from each plot. Soil and plant roots were washed into 40-mesh screens. Screens were immersed in salt water, and RWW immatures were recovered and counted. The center 4 rows of plots were harvested on 13 Sep with a small plot combine. Reported yields were adjusted to 12% moisture.