The Use of Chlorpyrifos in Controlling Weevil Borer, Rhabdoscelus obscurus Boisd. (Coleoptera: Curculionidae) in Sugarcane Setts.

Abstract

The weevil borer, Rhabdosceius obscurus is a serious pest of sugarcane at Ramu Sugar estate, Papua New Guinea. A mode of infesting newly planted sugarcane crops is from the use of infested seedcane. Field trials were established in 1987-89 to select a suitable insecticide for treating infested seedcane. It was shown that chlorpyrifos was superior to dichlorvos, dieldrin and fenitrothion as a dip to disinfest setts. The L C50 and L C95 for chlorpyrifos were 0.03% a. /'. and 1.50% a. /'. and 4.60% a. i. against all weevil borer stages.