Management of root-knot nematode, Meloidogyne incognita, infesting Egyptian henbane, Hyoscyamus muticus L., by the use of nematicides and oilcakes

Studies were carried out to evaluate the efficacy of various nematicides: aldicarb (Temik 10G), and carbofuran (Furadan 3G) at 3 kg a.i./ha, mocap (Ethoprop 10G) at 5 kg a.i./ha and oilcakes of castor (Ricinus communis L., 4.2% N), groundnut (Arachis hypogea L., 7% N), linseed (Linum usitassimum L., 4.7% N), neem (Azadirchta indica Juss, 5.4% N) and mustard (Brassica compestris L., 4.8% N) at 1 g N/kg of soil in the form of soil amendments for the management of Meloidogyne incognita (Kofoid & White) Chitwood infesting Egyptian henbane (Hyoscyamus muticus L.). All the treatments resulted in a significant increase in length, fresh and dry weights of henbane plants as compared with untreated inoculated plants. The maximum improvement in plant growth parameters was observed in plants treated with mocap followed by neem cake, aldicarb, carbofuran, castor, mustard, groundnut and linseed cakes respectively. Application of nematicides and oilcakes suppressed the pathogenic effect of M. incognita on Hyoscyamus muticus and resulted in significant reduction in gall intensity and population density of root-knot nematode in roots and soil. In comparison to untreated inoculated plants the highest reduction in root-knot index was noted in plants treated with mocap, whereas the lowest reduction was observed in plants treated with linseed cake.