The liquid formulations of Nomuraea rileyi, an important entomopathogenic fungus were prepared by using two vegetable oils and two mineral oils viz., olive oil, rice bran oil, liquid paraffin oil, heavy grade mineral oil. N. rileyi spore mass was harvested from culture plates and mixed to autoclaved test oils in the proportions of 0.1g (0.5 x 10⁸ spores/0.1 g) and 0.2g (0.1 x 10⁹ spores/0.2 g) per 100ml. Triton-X 100, a wetting agent was also used in two different concentrations i.e., 0.05% and 0.1% for all four test oils. The pathogenicity of N. rileyi conidia was studied at monthly intervals up to 5 months and mortality percentages of third instar larva of S. litura was calculated. Among the 16 oil based formulations of N. rileyi, rice bran oil with 0.2g spores and 0.1ml triton-X 100 oil formulation recorded highest larval mortality of 78-91 per cent followed by liquid paraffin with 0.2g spores and 0.1ml triton-X 100and heavy grade mineral oil with 0.2g spores and 0.1ml triton-X 100 oil formulation which recorded 74-89 and 69-86 per cent respectively. The remaining formulations recorded 28-85 per centlarval mortality.

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