Seasonal changes in population density and some host plants of the camellia root-knot nematode, Meloidogyne camelliae

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Populatioin densities of adult females and 2nd-stage larvae of Meloidogyne camelliae on camellias (2 Camellia japonica and 2 C. sasanqua) were examined in a field at Sagamihara, Kanagawa, monthly for a year (January, 1980-January, 1981). There were differences in plant growth and nematode fauna among the four camellias, but population densities of M. camelliae on each camellia were remarkably high in the spring and autumn and were remarkably low in the summer and winter. Optimum temperature for reproduction of M. camelliae in the field seemed to be around 13-14°C. Host plants of M. camelliae were examined in a glasshouse. The following 4 species of plants were recognized as new hosts of M. camelliae: Eurya japonica (very favorable, as were Camellia japonica, C. sasanqua and Cleyera japonica), E. emarginata (favorable), Thea sinensis (moderate), and Trifolium repens (slightly unfavorable).
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