
In the present study, five botanical oils namely sesame, castor, groundnut, pongamia and black cumin were tested against the adult of Aphis craccivora Koch to evaluate the toxic and repellent effects under laboratory conditions (25+- 5 degree C, 65-75% RH). Four concentrations (1.5, 2.0, 2.5 and 3.0%) along with on untreated control were utilized for the toxic and repellent study. Results indicated that all the botanical oils had different levels of toxic and repellent effects and found effective against the aphid. Among the tested botanical oils, the highest (40.50%) mortality was found in sesame oil while the lowest (30.50%) in black cumin oil against the aphid. The lowest LD50 values for sesame oil were found as 28.093, 4.529, 0.945 and 0.179 % at 12, 24, 36 and 48 HATs, respectively. Mortality percentages were dose dependent and proportional to the hours after treatments. The highest LD50 values were observed as 586.05, 14.860, 2.856 and 2.373% at 12, 24, 36, and 48 HATs, respectively for black cumin oil. Sesame oil also showed the highest repellent effect (69.00%) i.e., repellent class IV among all the botanical oils applied. On the contrary, black cumin oil showed the lowest repellent (33.33 %) effects, i.e., repellent class II. The order of toxicity was found as sesame oil > castor oil > groundnut oil > pongamia oil > black cumin oil considering all the concentration and efficacy. Therefore, among the tested oils sesame oil might be tested in field condition against the A. craccivora.
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