Abstract
Distinct morphological differences in the cone top and the underbridge of the cysts serve to separate Heterodera schachtii, H. schachtii var. trifolii, and H. avenae. Correlation between cyst volume and fenestral length of H. schachtii cysts was not significant. In H. schachtii the depth of the underbridge was significantly greater than in H. schachtii var. trifolii, but this difference may be of little taxonomic value because of the variation within the two forms.
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