Sugarbeet Root Maggot Control, 1986

Abstract

Abstract An experiment for sugarbeet root maggot control was conducted in a sprinkler irrigated field near Paul, Idaho. The grower field was planted 7 Apr. Five treatments and an untreated check were replicated 6 times in a randomized complete block design. Individual plots were 6 rows (22 inch spacing) by 30 ft. After plant emergence, plants were hoed to make alleys between plots so that each plot was then 25 ft long. Planting applications of Temik consisted of a modified in furrow (MIF) technique where the material was applied to the soil surface in a one-inch band just ahead of the planter disc openers. The Temik was then incorporated back over the seed furrow with the planter press wheel. The second Temik planting application (P) was applied by hand in a five-inch band over the seedbed and incorporated lightly with a small garden rake. Lorsban, Counter, and Temik were applied postemergence (PE) on 3 Jun with Ro-Banders® in a five-inch band over the row and lightly incorporated with a drag chain. Root maggot damage (ten beet roots from each plot were rated for maggot feeding damage on 25 Jul) is reported in the table as the sum of the ratings for 10 beets per plot. The rating scale was: 0 = no scars; 1 = 1-4 small scars of pinhead size; 2 = 5-10 small scars to 3 large scars; 3 = more than 3 large scars; 4 = 25 to 75% root area blackened by scars; 5 = more than 75% of root area damaged. Yield data were taken 7 Oct by hand harvesting 50 ft of row selected from the middle four plot rows. Due to variable plant stands, yield data were only taken from 4 of the 6 replications. Sugarbeet yield weights in the table are untared.