Year: 2017 | Month: August | Volume 10 | Issue 4
Efficacy of some Medicinal Plant Oils against Cabbage Aphid, Brevicoryne brassicae L. On Cabbage
Abstract:
Field experiments were carried out at Vegetable Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi U.P. during the year 2016-17 to control the Bravicoryne brassicae in cabbage variety Golden acre. result revealed that Among the all the essential medicinal plant oils the maximum reduction of aphid population over control was observed in plots treated with Citronella oil (85.25%) followed by Pogostemon cablin oil (80.21%). Whereas, Mentha oil (58.48%) 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 are found in order of Citronella oil > Patchouli oil > O. basilicum var. saumya > Palmarosa oil > O. basilicum var. Surabhi > O. basilicum × O. tenuiflorum > Asataf > Turmeric oil > Mentha oil. The effect of different essential oils on cabbage yield was also studied under investigation; and maximum yield of cabbage heads was obtained in the plots treated with Citronella oil (233.89 qha-1) and Minimum yield obtained menthe oil (217.22 qha-1) Over the control and then The highest B/C ratio was found in the treatment of Cymbopogon martinii 0.05%(31.27:1) whereas, the lowest B:C ratio of 17.70:1 was obtained in Mentha oil treated plot followed by Curcuma longa 0.1% (22.82:1). Though the maximum yield was obtained from plots treated with Cymbopogon citrates oil. However, the highest B/C ratio was obtained from the plots treated with Cymbopogon martinii oil. This is so, because of differences in cost of essential oils.
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