Control of Rice Water Weevil with a Seed Treatment, 1992:

Abstract

Two rates of GUS-IG13 (X-3G43) (formerly NTN 33893) as seed treatments were compared with carbofuran (Furadan 3 G) and an untreated check for control of RWW in ‘Newbonnet’ and ‘Lemont’ rice. The experimental design was a randomized complete block with 4 replications for each variety. Plot size was 9 rows with 17.8 cm spacing X 4.88 m. Rice was drill-seeded at 123.2 kg seed/ha 28 Apr and emerged 8 May. Propanil and thiobencarb at 3.36 kg (AI)/ha each were applied 18 and 22 May for weed control. Plots were temporarily flooded (flushed) 8 May and permanently flooded 6 Jun. Urea, 151.2 and 201.6 kg/ha, was applied in a 3-way split of 84 and 133.6 kg/ha 6 Jun and 33.6 kg/ha each on 10 and 21 Jul for ‘Newbonnet’ and ‘Lemont’ plots, respectively. Carbofuran was applied with a hand shaker 15 Jun. On 30 Jun and 7 Jul and on 2 and 9 Jul, 5, 10.2 x 10.2 cm (diam by depth) soil cores were removed from each plot of ‘Newbonnet’ and ‘Lemont’, respectively. 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 8 Sep with a small plot combine. Reported yields were adjusted to 12% moisture.