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Root – knot nematodes (Meloidogyne spp.) are one of the most wide spread pests limiting world agricultural productivity and their control in future will largely depend on the continued development of resistant varieties as well as careful management practices which rely less on chemicals and more on plant inbuilt strategies to fight pathogens. So far, the conventional systemic nematicides were readily used by previous workers in several crops for the management of root-knot nematode. However, adverse effect on environment and human health is limiting the use of such nematicides in India. Therefore, in the present investigation, the bio-pesticide property of the fruit extract of Citrullus colocynthis on the root-knot nematode Meloidogyne incognita infecting Vigna ungiculata was carried out. The total carbohydrate content, total chlorophyll content and root gall index present in the leaves of control, inoculated with root- knot nematode and in the inoculated plants treated with fruit extract of Citrullus colocynthis were analyzed and the root gall index that was an indirect measure of nematode population density after treatment was also studied.
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