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Susceptibility of teak (Tectona grandis) skeletonizer larvae to entomopathogenic nematode, Heterorhabditis indica Poinar (PDBC, Bangalore, India strain) was bioassayed in laboratory. No report is available on infectivity and virulence of EPN, H. indica on E. machaeralis. Bioassays included exposure of early last instar larvae of the teak skeletonizer to two bioassay conditions; filter paper bioassay (3, 5, 10, 20 and 30ijs larvaG) and leaf treatment (30, 60, 100, 200 and 300 ijs LarvaG) for susceptibility and determining critical 1 1 doses. While filter paper bioassay provided data on infectivity of H. indica to E. machaeralis, leaf treatment using Potter's Tower, simulated field spray. Larvae of E. machaeralis, when exposed to ijs of H. indica, in filter paper experiment 35.29% mortality was obtained at the lowest dose of 3 ijs larvaG, 100% mortality was obtained 1 at the highest dose of 30 ijs larvaG, with dose-dependent mortality in between. However, ten times more doses, 1 ie, above 30 ijs LarvaG were required to cause larval mortality when larvae were exposed to leaf treatment 1 experiment using Potter's Tower. LC, LC, LT and LT values for H. indica in filter paper bioassay (4.57,