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The Development of Heterodera Rostochiensis and Meloidogyne Incognita in Cross-Grafted Solanaceous Plants With Different Susceptibilities

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For more content, see Nematology.

Two experiments have been done to find out whether cross-grafting resistant and susceptible Solanaceous plants would affect the development of nematode parasites within their roots. Firstly, cross-grafted plants of susceptible Tomato (Lycopersicum esculentum MILL.) and resistant Black Nightshade (Solanum nigrum L.) were inoculated with larvae of Heterodera rostochiensis WOLL. In these plants the larvae developed normally irrespective of the scion, cysts being found on plants with a tomato root-system and none on those with a S. nigrum root-system. Secondly, larvae of Meloidogyne incognita (Kof. & White) Chitwood, 1949, were inoculated into soil around the roots of cross-grafted plants of susceptible Tomato and resistant Lycopersicum peruvianum. (L.) MILL. Very few female nematodes were found in the plants with L. peruvianum root-systems. In plants with Tomato root-systems many females were found, but the total numbers and the percentage of those with eggs were significantly lower on those with L. peruvianum scions than on the self-grafted Tomatoes. Thus, while there was apparently no transference of susceptibility from the Tomato scion to the resistant L. peruvianum rootstock, a scion of L. peruvianum decreased the susceptibility of a Tomato rootstock to attack by larvae of M. incognita.

Affiliations: 1: (Rothamsted Experimental Station, Harpenden


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