Abstract
Abstract Season long control of SCB was tested in a small plot experiment located at the St. Gabriel Research Station, St. Gabriel, LA. Thirteen insecticide treatments were evaluated in a field of first ratoon sugarcane. The experimental design used a RCB with 5 replications and each plot consisting of 3 rows (1.8 m centers), 7.3 m in length equivalent to 0.004 hectares per plot. Insecticides were applied when SCB infestations exceeded the economic threshold level of 5% of the stalks containing live larvae in the leaf sheaths. The spray treatments were applied to the sugarcane canopy of all rows in each plot with a knapsack sprayer (pressure and output ca. 1.41 kg/cm2 and 250 liters/ha, respectively). The 2 granular treatments were applied using a 400 ml shaker jar calibrated to deliver the designated amount to the canopy (Aug 5, Sep 3, and Sep 23). SCB damage was assessed by counting the number of bored internodes, exit holes, and total internodes from 100 randomly-selected stalks (5 replications, 20 stalks/rep) of sugarcane in each treatment (Nov 6).
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