A new stem nematode, Ditylenchus weischeri sp n. (Nematoda: Tylenchida), a parasite of Cirsium arvense (L.) Scop. in the Central Region of the Non-Chernozem Zone of Russia

摘要

A new species of the stem nematode, Ditylenchus weischeri sp. n. parasitising creeping thistle, Cirsium arvense (Asteraceae), is described from material collected in the Moscow region, Russia. Ditylenchus weischeri sp. n. differs from D. dipsaci by shorter tails in adults, larger c index, shorter spicules, longer vulva-anus distance, larger vulva-anus distance to tail length ratio and longer posterior sac. Ditylenchus weischeri sp. n. differs from other Ditylenchus in ITS-rRNA and hsp90 gene sequences and chromosome numbers. Ditylenchus weischeri sp. n. did not develop and complete its life cycle in onion and garden strawberry seedlings, which are typical hosts for D. dipsaci. Diagnostic PCR-ITS-RFLP profiles are given for D. weischeri sp. n. and D. dipsaci.