The Sex Ratio of Heterodera glycines at Low Population Densities

D. M. Evans, J. A. Fox


The sex ratio of the Arkansas 1 isolate of Heterodera glycines was determined in experiments in which 'Lee' soybean was inoculated with either one or two larvae. A 3:1 male to female sex ratio was established for this isolate under the test conditions used. No influence of one nematode on the penetration and development to adult of another nematode in the same root was detected in double larval inoculations . Key Words: cyst nematodes, nematode-nematode interaction, soybean.

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