Bioactivity of Nomuraea rileyi against Spilosoma obliqua : Effect of dosage, temperature and relative humiditty

Nomuraea rileyi caused 90% mortality in second instar larvae of Spilosoma obliqua at 8.97×10 7 conidia/ml with LT 50 as 144 hrs, LD 50 value was calculated to be 8627677 conidia/ml. The pathogen was infective between 20°-28°C temperature, optimum being 28±1°C. 100% R H favoured maximum mortality of 92% with progressive decline at lower humidities.