In recent years, plant oils and entomopathogens play a potential role in eco-smart management of insect pests due to their eco-friendly, effective and specific nature and hence needed to be prioritized as an alternative to chemical control in the pursuit of a healthy nation. The present investigation was made to study the compatibility of Beauveria bassiana with four plant oils at three different concentrations (neem oil @ 2.00, 1.00, 0.50 per cent; karanja oil @ 2.50, 1.00, 0.25 per cent, jatropha oil @ 4.00, 2.00, 0.50 per cent and citronella oil @ 0.30, 0.50 and 1.00 per cent). It was studied considering four aspects viz., radial growth, conidial production, sporulation and per cent inhibition for compatibility test. It revealed that citronella oil @ 0.30 + B.bassiana 1x107 conidia/ml combination was highly compatible with T value 79 followed by 74 and 72 in neem oil (0.50%) + B. bassiana (1x107 conidia/ml) and citronella oil (0.50%)+ B. bassiana (1x107) conidia/ml) respectively. Otherwise, jatropha oil (4.00%) + B. bassiana(1x107 conidia/ml) recorded the lowest T-value (45.70) indicating less compatibility showing moderate toxicity. The highly compatible combination of citronella oil @ 0.30 + B.bassiana (1x107 conidia/ml)would be a potential bioagent in pest management andcould enhance its virulence against insects at low cost too.