Potentiality of Nettle (Urtica dioica L.) Extracts
in Controlling Aphids

T. B. Sapkota, N. N. Khanal

Series of laboratory and greenhouse experiments were conducted at Institute of Agriculture and Animal Science (IAAS) to assess the effectiveness of nettle extract for the management to aphid (Brevicoryne brassicae L.) on broad leaf mustard in 2002. In laboratory, broad leaf mustard leaves in moist chamber (petri plate containing moist filter paper) were treated with different treatments followed by releasing 20 aphids per plate to test repellent and pesticidal effect of nettle extract. In greenhouse, broadleaf mustard plants at three-leaf stage were inoculated with 40 aphids followed by spraying different nettle treatments. Although the nettle extract at 20% concentration promised to be effective against aphids in the laboratory bioassay, the result of greenhouse experiment did not corroborate the laboratory results. However, the study did give an indication that nettle contains some active substances that can kill or devitalize the aphids. It is a matter of further research as to whether chemical separation of these substances for pest management purpose is economically viable and technically feasible in our context.

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