Cotton, H. Zea, H. Virescens, A. Grandis Control, Chickasha, 1975

Lockett 4789A was planted on June 5, 1975 at 20 lb per acre. Eight row plots, 200 ft long, replicated 3 times in a complete randomized block design were used. Spray applications were made with a John Deere Hi-Cycle 600 sprayer traveling at a speed of 4.5 mph at 40 psi. Insecticide applications consisted of using 5 gal of total spray mixture per acre, with 1 number 8 (Spraying Systems) nozzle per row. Eight applications were made between August 6 and September 6. Intervals between applications ranged from 4 to 6 days. Plots were not irrigated. Rainfall was light during the test period and did not effect the treatment schedule. Damage was estimated by collecting at random 100 fruits prior to spraying from the upper one-third of the plants in each plot. Heliothis sp. and boll weevil populations were moderate to heavy. On August 22, 50 larvae were collected for species determination. Sixty-two percent were H.zea and 38% H.virescens. On September 2, 11 larvae were collected and 57% were H.zea and 43% H. virescens