The entomogenous nematodes Steinernema feltiae, Heterorhabditis bacteriophora, and H. heliothidis were applied to larvae of Opogona sachari infesting potato (Solanum tuberosum) and bamboo palms (Chamaedorea elegans). The applications resulted in successful establishment of the nematodes and a 58-100% reduction of larval numbers in infested potatoes and bamboo palms.