Abstract
Abstract Insecticide sprays were applied in a field of sugarcane (variety CP 61-37, plant cane crop) at the Daniel Boudreaux Farm near Napoleonville, LA to determine season-long control of Sugarcane borer (SCB) infestations. A randomized complete block experimental design was employed with 6 replicates. Individual plots were 3 rows × 24 ft on 6 ft centers (0.01 acre). Treatments were applied in water at 30 lb psi to the canopy with a compressed air knapsack sprayer that delivered 25 gallons of finished formulation. Each insecticide was applied 3 times at the following intervals: July 18, August 9 and September 8. Applications were begun when 5% of the stalks contained small SCB larvae in the leaf sheaths and were repeated whenever that level of population occurred again in Guthion-treated plots. The efficacy of different insecticide treatments was determined at harvest-time by comparison of the % internodes bored by SCB larvae in treated plots with the number bored in untreated (control) plots. Twenty stalks were selected at random from the center row of each plot on October 3 and examined for external signs of SCB entrance and exit holes.
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