Aztec and Mocap on Yield and the Incidence of Wireworm Holes in Potato, 1994

Abstract

Abstract The trial was conducted at Madrid, NE, on a well drained loamy soil with a pH of 6.8 and 2% organic matter. Fertilization was 130 lb N/acre, 100 lb P/acre, 40 lb K/acre, and 90 lb S/acre. Precut, TOPS 2.5D-treated potatoes variety ‘Krantz’ were planted on 21 April. Soil temperature at planting was about 50 deg F. Ridomil/ Bravo for blight control and Champ were applied. Asana was applied to foliage for Colorado potato beetle control. Turbo was applied at emergence and Eptam post emergence for weed suppression. Temperature and rainfall were normal or slightly above. Irrigation was about ½ inch per week during tuber bulking using a center pivot. Mocap 10G at 2.1 lb, Aztec 2.1%G at 0.48 lb, at 0.64 lb and 0.96 lb/1000 linear feet were applied into the furrow in a 5-7 inch band prior to seedpiece drop. Aztec at 0.64 lb/1000 lin feet was also tested with an application after seedpiece drop. Treatments were replicated three times in a completely randomized design. Plots were two rows spaced 36 inches apart and 40 feet long. They were harvested on 17 Aug. Wireworm holes were counted in 100-tuber subsamples (50 per row)/plot. Ten bait stations, each consisting of one packet of wet corn, one of wheat and one of millet, placed into soil in the trial field. They were collected several weeks later (Jun). Six wireworms were H. memnonius and four were in the genus Melanotus (species unidentified). Four of the wireworms were in the wheat packet and three in the soil around the station. One H. memnonius was in the corn and two Melanotus spp. were in the millet.