1972•NematologicaRequires access

Heterodera Pallida N. Sp. (Nematoda: Heteroderidae), a Second Species of Potato Cyst Nematode 1)

Alan Stone

Abstract

The pathotypes of Heterodera rostochiensis Woll. 1923 with white or cream females are described as a new species, Heterodera pallida, subgenus Globodera Skarbilovich, 1959, from England. It differs from H. rostochienis in having a larger second stage larva with a stylet on average about 23 μm long (21 μm in H. rostochiensis) and basal stylet knobs pointed anteriorly (rounded in H. rostochiensis); in having cysts with Granek's ratio less than 3.0 (greater than 3.0 in H. rostochiensis) and only 8 to 20 cuticular ridges between anus and fenestra (16 to 31 in H. rostochiensis) and in having females that remain white or cream (golden yellow in H. rostochiensis).

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Key concepts: Heterodera, Biology, Stylet, Potato cyst nematode, Nematode, Globodera rostochiensis, Subgenus, Larva