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Plots were established in a commercial potato field near Little Creek, De.on 2 May. Soil type was a sandy loam with a high moisture content due to persistent, heavy rains. Each plot consisted of 3 rows (0.9 m apart) 6 m long. The plots were arranged in a randomized complete block design in which treatments were replicated four times. Only the middle row of each plot received treatment. The outside rows served as a reservoir for the CPB. The granular insecticides were applied using a single row Noble applicator. The seed furrows were opened with a commercial planter, the insecticides applied and the seed pieces placed in the furrow by hand. The furrows were then closed. The drag-off treatment was applied on 11 May by dispensing the insecticide as a 5-inch band over the hills immediately before drag-off. At the first cultivation on 6 Jun, the appropriate insecticides were applied as a sidedress in the cultivation furrow.

Tests were conducted in a no-till field planted Jul 2 in 38 inch rows after wheat. At time of treatment, the corn averaged 3 ft (mid whorl stage) and damage was heavy with 0.5-2 larvae/plant. Treatment plots were 4 ft x 15 ft rows for foliar sprays and 2 ft x 15 ft rows for granular treatments arranged in a randomized complete block design with 4 replicates. Treatments were made on Aug 6. Sprays were applied with a back pack CO2, boom sprayer calibrated to deliver 40 gpa at 32 psi. Granular treatments were applied by hand shaker cans over the whorl. Post-treatment counts of larvae were made on 10 plants selected at random from the center 2 rows of each plot Jul 7.

Tests were conducted on 2 farms, Poplar Hill Research farm, Quantico, Wicomico County and Snow Hill, Worcester County. At time of treatment, corn at both locations was near the tassel or late whorl stages, Treatment plots were four 15 ft rows arranged in a randomized complete block design with 4 replicates. Pre-counts were taken on Jul 30 at Snow Hill and Aug 10 at Poplar Hil.

Tests were conducted in a 2-yr-old production alfalfa stand in Baltimore County. Pre-counts were made on May 12 and weevil larvae averaged 39 per dip sweep of a 15 inch standard size net. Treatment plots were 10 ft x 15 ft and arranged in a randomized complete block design with 4 replicates. Plots were sprayed on May pack sprayer calibrated to deliver 10 gpa at 30 psi. Plots were sampled for post-counts on May 19.