Abstract
The clover cyst nematode, Heterodera trifolii (Goffart, 1932) Raski and Hart, 1953, reproduced in the absence of males. Under greenhouse conditions nematodes reared from single larvae and from mass cyst culture were diploid-parthenogenetic. During maturation only one polar body was produced. The diploid number (24 ?) of chromosomes was not reduced and no male was found.
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