Abstract
The result revealed that among all tested essential oils from medicinal plants, the maximum reduction of aphid population over control was observed in plots treated with Cymbopogon citrates oil (85.2%) followed by Pogostemon cablin oil (82.21%). Whereas, Mentha piperita oil (58.4%) was found least effective in reducing the aphid population over control. The tested plant essential oils and insecticide on the basis of field efficacy in reducing aphid population were found in order of Cymbopogon citrates oil > Pogostemon cablin oil > Eucalyptus oil > Neem oil > Ocimum basilicum. Maximum mustard yield was obtained in the plots treated with Cymbopogon citrates oil (16.09 qha−1) and minimum with Dimethoate (9.76 qha−1) compared to the control (5 qha−1). The highest B/C ratio was found in the treatment of Neem oil (5.43: 1) whereas, the lowest B: C ratio of 3.07: 1 was obtained in Curcuma longa treated plot. Though the maximum yield was obtained from Cymbopogon citrates oil owing to its effectiveness against mustard aphid, but B/C ratio was higher with Neem oil because of differences in cost of essential oils.
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