Thrips Control in Peanuts, North Carolina, 1992:

Abstract

Abstract At-plant, in-furrow, and foliar-applied insecticides were evaluated for tobacco thrips control at the Peanut Belt Research Station in Lewiston. NC-7 variety peanuts were planted on 36 inch rows on 12 May at approximately 85 lb seed/acre. Soil temperature was 72°F and the soil was moist (0.6% H.M. and 5.8 pH). Soil series consisted of Rains + Goldsboro sandy loam. Prowl and Vernam were used for early season weed control. Plots were 2 rows wide x ft long, and each plot was separated by 2 buffer rows with plot ends separated by a 5 ft barren strip. Plots were arranged in a randomized complete block design with 4 replicates. Peanuts were planted using a Cole planter, and in-furrow treatments were placed in the furrow with the seed using electric Gandy® boxes. The in-furrow application of Orthene was applied by mounting spray nozzles directly j behind the seed tube and connecting these to a CO2-pressurized sprayer on the planter. The sprayer was operated at 40 psi and delivered approximately 15 * gal/acre. Band applications of Temik were applied using glass jars with perforated lids to act as shaker-type dispensers for the required amount of product I over the row. The orthene seed treatment was applied by taking a known quantity of seed in a 5 gal bucket and adding the appropriate amount of Orthene J to the bucket and shaking the contents gently for 15 s. The seed was then placed into empty hoppers on the planter. The NTN 33893 seed treatment was pretreated by manufacturer. Treatments, rates, and application techniques are listed in the table. Foliar treatments were applied when damage was found on at least 25% of the leaflets. Since at-plant treatments varied in the amount of damage, all foliar treatments exceeded the threshold for damage. Foliar applications were made following the 18 Jun sample with a backpack CO2-powered sprayer operating at 40 psi and using 8002 flat fan nozzles. Peanuts were otherwise managed under standard agronomic practices. Thrips control was evaluated by determining the abundance of damaged leaflets per plot on 11, 18, 24 Jun and 1 Jul. Twenty-five newly-opened leaflets per plot were randomly selected and examined for thrips damage. The number of damaged leaflets were recorded. All data were transformed X + 0.5 prior to analysis. Actual means are presented in the table.