F86

Seven insecticide treatments in addition to an untr eated control were evaluated for season long control of the sugarcane borer, Diatraea saccharalis, in a randomized block design with five replications in a sugarcane field of 2 nd ratoon HoCP 96-540 in Burns Point, LA. Treatment plo s consisted of three 24-ft rows (0.01 acre) separated by 5-ft gaps. Insecticide applications were made the mornings of 5 Aug and 30 Aug when infestat ions exceeded the treatment threshold of 5% of stalks with borer larvae present in leaf shea t s. Insecticides were mixed in 2 gal of water and applied using a Solo back pack sprayer deliveri ng 40 gallons/acre at 20 psi. Borer injury to sugarcane was assessed at the time of harvest (5 Oc ) by counting the total number of internodes (15 stalks/plot), number of bored internodes and mo th emergence holes in each stalk. Proportion of bored internodes was analyzed using a generalize d lin ar mixed model (Proc Glimmix, SAS Institute) with a binomial distribution, and means were separated with Tukey’s HSD ( α = 0.05). Emergence data was analyzed using a generalized lin ear mixed model (Proc Glimmix, SAS Institute) with a normal distribution. Insecticide treatments provided substantial control and significantly reduced the proportion of bored internodes when compared to untreated checks (F = 70.8, P <0.0001, df = 7, 587). Percentage of bored internodes in the treated plots ranged between 0.09-1.3% compared to the 20.3% observed in the untreated check. Besiege app lied at 9.0 oz/acre showed greatest reduction in internode injury; however, differences were not de ected among the insecticide treatments. Adult emergence ranged between 0.0-0.72 emergence h oles per stalk, and followed the same trend as percentage bored internodes ( F = 26.7, P <0.0001, df = 7, 586).