VERTICAL MOVEMENT AND DISTRIBUTION OF MELOIDOGYNE INCOGNITA (NEMATODEA) UNDER TOMATO IN A SANDY LOAM GREENHOUSE SOIL

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Abstract
The southern root-knot nematode, Meloidogyne incognita (Kofoid and White 1919) Chitwood 1949, escaped control by steam, Vorlex, or a combination of both at soil depths below 100 cm in naturally infested sandy loam greenhouse soil. Nematodes moved upward to infest the subsequent crop. In microplot studies M. incognita moved rapidly in both directions through a soil depth of 150 cm. High nematode population densities and root gall indices on tomato (Lycopersicon esculentum Mill.) roots were recorded through depths of 150 cm in soil inoculated with 4,400 M. incognita/kg in the top 30 cm or 120–135 cm below the surface. In the top 30 cm of soil this initial population density reduced tomato yield by 20% in the first crop and 70% in the second. Similar population densities 120–135 cm from the soil surface reduced tomato yield by 11% in the first crop and 59% in the second.

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