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A full season study was conducted at the Plant Science Research Farm of the Mississippi Agricultural and Forestry Experiment Station, Mississippi State, MS, to determine the efficacy of various insect growth regulators (IGR’s) and microbial agents in controlling Heliothis spp. larvae on cotton. Plots were planted on May 20. The experimental design was a randomized complete block with 4 replications. Each plot was 4 rows (3.6 m) x 27.4 m with 2 buffer rows between plots. Insecticides were applied by: (1) boom-type sprayer calibrated to deliver 6.5 gal/acre at 16.6 psi through 2 TX-4 nozzles/row, or (2) through 1 Micromax nozzle/row, delivering 1.4 gal/acre. Treatments were applied on Jul 30, Aug 5, 12, 18 and 27. All plots were oversprayed for boll weevil suppression on Aug 11, 21, 27 and 31 with 0.25 lb ai/acre Guthion. Insect populations and plant damage were monitored at weekly intervals by making whole plant examinations on a consecutive 1.07 m row length. Yield data were taken on 27 Oct by mechanically harvesting the 2 center rows of each plot.

Control of Heliothis SPP. in Cotton with Insect Growth Regulators and Microbials, 1982