This study examined the ribosomal cistron of Ditylenchus destructor, D. myceliophagus and seven host races of D. dipsaci from different geographic locations. The three species showed restriction fragment length polymorphisms (RFLPs) in the ribosomal cistron, the 18S rDNA gene, and the ribosomal internal transcribed spacer (ITS). Southern blot analysis with a 7.5-kb ribosomal cistron probe diffe...

With the need to obtain new methods protect seed material from Ditylenchus dipsaci (KĂźhn, 1857) nematodes, a study was conducted evaluate nematicidal effects of several plants' essential oils on mortality D. dipsaci. Tests were performed under in vitro conditions; concentration 2 000 ppm tested, nematodes added into diluted oils, and numbers living/dead scored after 4 24 h. The results show si...

Transmission of Corynebacterium insidiosum (McCull.) Jensen (cause of bacterial wilt in alfalfa) by the stem and bulb nematode Ditylenchus dipsaci (Kiihn) was demonstrated by Hawn (3) . Disease development in plants where D. dipsaci was the vector was comparable to that in the controls where wilt was induced by the root-ball soak method devised by Cormack, Peake and Downey (1) . Furthermore, th...