Beauveria bassiana and B. brongniartii strains 1, 2 and 3, were evaluated for their pathogenicity against the oil palm bagworm, Pteroma pendula. In a laboratory trial, the fungal isolates were found to cause mortality of up to 100% in the first and second larval instars of P. pendula. The lethal dose causing 80% mortality values (LD₈₀) for B. bassiana and B. brongniartii strains 1, and 2 was 1 x 107 spores ml^-1. The lethal time to 50% mortality value (LT₅₀) of all the isolates was seven days and the lethal time to 80% mortality value (LT₈₀) was 11 days. The results suggested that all four isolates were equally pathogenic to bagworm larvae at a high dose of spore concentrations.