Abstract
Abstract Insecticides were applied to first ratoon sugarcane (4 replications) at Palo Alto Plantation, Donaldsonville, LA, for season-long control of SCB. Each treatment was applied in water using an Ag Cat with swaths of 14.5 m (8 rows) wide delivering 18.7 liters of finished product/hectare. The 1st application was made when 60% of the stalks showed visible internodes, and >5% of stalks sampled contained live larvae present in the leaf sheaths (the Louisiana State University-recommended threshold). The 1st treatment was applied on 28 Jul; the 2nd on Aug 16, when SCB infestation in the Asana XL treatment exceeded the economic threshold. SCB damage was estimated by examining 15 plants at 5 locations in each plot (75 stalks). The number of bored internodes, exit holes and total number of internodes were counted (Oct 9) and statistically analyzed using Analysis of Variance and mean separation by LSD (0.05) tests.
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