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Population Changes and Development of Meloidogyne Naasi in the Field

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For more content, see Nematology.

Experiments show that soil samples, especially those taken between October and April, yield more larvae if they are incubated for a week at 20°C than if they are processed on the day they are taken. Samples taken in autumn after a host crop and kept at 0°C for a week before incubation yield more larvae than incubated, non-chilled samples. The numbers of free larvae in field soil are few during winter, increase greatly as the soil temperature increases in spring, decrease sharply when the host roots are invaded, remain low during summer and show a moderate increase when some of the newly formed eggs hatch in late summer. In the absence of a host crop numbers increase in spring and decrease gradually during summer. The rate of development of M. naasi in host roots depends on temperature and is the same in barley and ryegrass. The amount of energy in the form of heat required for development is approximately the same throughout the year but the time taken varies greatly.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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