Abstract
Aims: Study the mortality rate of aphid, Aphis craccivora Koch when treated with different essential oils against the nymphal stage.
 Study Design: Complete randomized design.
 Place and Duration of Study: Biswanath College of Agriculture, Biswanath Chariali during 2022-23
 Methodology: All essential oils were applied at three different concentrations viz., 1%,3% and 5% and recorded the mortality percentage after 4,12, 24, 48 and 72 hours of application.
 Results: The result showed that neem oil had the best effect on the mortality of nymph (96.67%,100%,100%) in 1,3 and 5 per cent concentration after 72 hours after treatment. The second highest mortality was recorded against nymphs in mint oil (83.33%) followed by clove (80.00%), garlic (76.67%), ginger (73.33%) and eucalyptus (66.67%) oil against nymphs at 72 hours after treatment.
 Conclusion: In the present study essential oils showed that mortality rate increased with increasing concentration and times.
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