Thrips Control in Peanuts Using At-Plant Insecticide Applications, North Carolina, 1989

Abstract

Abstract At-plant, in-furrow insecticides were evaluated for tobacco thrips control near Hertford in Perquimans Co. Peanuts were planted on 24 May using a Cole planter (36 inch rows) at approximately 100 lb seed/acre. Soil series was Roanoke silt loam with 0.5% H.M. and pH 5.7. At planting, the soil was moist and 70°F. Post emergence treatments of Poast + crop oil and Storm + surfactant were used for early season weed control. Plots were 2 rows wide × 50 ft long, and each plot was separated by 2 buffer rows. Plots were arranged in a randomized complete block design with 4 replicates. Plot ends were separated by a 5 ft barren strip. Treatments, rates, and application techniques are listed in the table below. In-furrow treatments were placed in the furrow with the seed using electric Gandy® boxes. Foliar treatments were applied on 13 Jun using a CO2-pressurized backpack sprayer delivering 30 gal/acre at 40 psi using 8002 flat-fan nozzles. All pegging treatments were applied using a Noble metering unit mounted on a bicycle wheel cart. Each plot (including the second Temik treatment applied 18 Jul) was treated with Mocap 10 G for rootworm control on 18 Jul. Peanuts were otherwise managed under standard agronomic practices. Thrips control was evaluated by determing the abundance of damaged leaflets/plot. Fifty newly-opened leaflets/plot were randomly selected and examined for thrips damage. The number of damaged leaflets was recorded. Sampling was conducted on 3 dates: 13, 20, and 27 Jun. All data were transformed X + 0.5 prior to analysis. Actual means are presented.