Evaluation of Exp 61096A for Control of Rice Stink Bug in a Cage Study, 1997

Abstract

Abstract A field study was conducted to compare RSB control using EXP 61096A and a standard, methyl parathion. The experimental design was a RCB with 3 replications. Plot size was 9 rows (7-inch spacing) by 15 ft. Rice was drill seeded in Crowley silt loam at 90 lb/acre on 6 May and emerged on 17 May. Nitrogen was applied in a 3-way split of 75 lb N/acre as urea on 16 Jun and 30 lb N/acre on 10 and 23 Jul. Permanent flood was established on 22 Jun. Rice was 50% headed (panicle emergence) on 6 Aug. Insecticides were applied on 25 Aug with a CO2-pressurized backpack sprayer at 18 gpa. Three days to applications, adult RSB were hand collected from rice fields and placed in 5-gal plastic buckets with bouquets of heading rice and weed host plants in water. Host plants were changed at 3 d intervals. Shortly before applications, 3 RSB were placed in nylon tulle sleeve cages, 4 inches diam by 14 inches long. Cage tops were closed with twist ties. RSB were herded to one end where a string was tied around the cage, effectively keeping the RSB confined to one end. Within 15 min after each insecticide application, 3 sleeve cages were pulled over 2 rice panicles and flag leaves and held in place with twist ties around the plants. Sleeve cages with RSB were also placed in plots 24, 72, and 120 h after insecticide application. After 72 h of exposure, plants were cut below the cage and taken to the laboratory where RSB mortality was determined. Data were analyzed with ANOVA and means separated by LSD.