Soil Systemics Applied At Plant, and Emergence for Potato Insect Control in Irrigated Potato, 1987

An irrigated trial was located in a commercial field at Kay Farms near Brooten, Minn. The field was planted 22 Apr with a 6-row commercial planter. Insecticide applicators were disconnected while the experimental area was being planted and then reconnected to complete field rows. The main field was treated with 3 lb (AI)/ acre of Thimet. Fertilizer, weed control, etc., were constant throughout the experimental and production field. Plots were 4 38-inch rows 30 ft long, replicated 3 times, and arranged in a randomized complete block design. The plot area was located 6 rows from the pivot road and extended 150 ft from the field edge into the main field. The soil was a sandy loam. At-plant treatments were applied on 23 Apr and lightly covered. Emergence treatments were applied 20 May. Foliars were applied on 22 Jun, 10 and 22 Jul, and 10 and 20 Aug. Foliars following emergence granular applications were applied on 3 and 22 Jul. Foliars were applied using a hand-held CO2 sprayer using 40 psi pressure and 12 gal total material/acre. Yields were taken by digging the 2 center plot rows, grading into #ls and B-size, and recording.