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Factors Affecting Emergence, Survival and Infectivity of Meloidogyne Naasi

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For more content, see Nematology.

Soil moisture affected larval emergence and infectivity of Meloidogyne naasi. Most larvae emerged in soil that was kept at 74% field capacity in a monthly drying cycle and least in soil that was flooded constantly. The converse was true for the larval invasion tests following exposure to these different moisture regimes. A similar phenomenon was observed in the flooding and fallowing experiments where greater larval invasion was observed following flooding of the soil than in soil that was fallowed or left to natural weed growth for up to 12 weeks. Lipid disappeared most rapidly in second stage M. naasi larvae stored under aerobic conditions. Storage in unstirred distilled water at 15° limited infectivity to 4-8 days with concurrent reduction in lipid reserves. Some larvae became quiescent under anaerobic conditions. In unstirred water many larvae became quiescent and infectivity was lost between 8-16 days, although lipid reserves were only partially depleted under these conditions.

Affiliations: 1: Imperial College Field Station, Ashurst Lodge, Ascot, Berkshire, England


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