Efficacy of Insecticide Treatments on Squash, 1992

The test was conducted at the Wes Watkins Agricultural Research and Extension Center, Lane, Oklahoma. ‘Lemon Drop’ summer squash plants were transplanted 2 Jun, into beds with black plastic mulch and irrigated with a surface trickle irrigation system. Plots were arranged in a randomized complete block design replicated 4 times. Each replicate consisted of a single row of 6 plants (2-ft plant spacing) on 6 ft centers. Rows were separated by 10 ft buffers. Foliar sprays were applied 11 and 19 Jul with a CO2-powered backpack sprayer mounted with 2 TX-18 nozzles calibrated to deliver 21.36 gallons per acre. Efficacy was evaluated by counting squash bug nymphs on 3 randomly selected plants per plot and alate and apterous melon aphids on 12 leaves/plot from the 3 plants with 4 leaves selected randomly from the central section of each plant. Counts were made 15 Jul (4 days after first treatment), 18 Jul (7 days after first treatment), 23 Jul (4 days after second treatment), and 26 Jul (7 days after second treatment). The data were subject to ANOVA and LSD.