Nematode parasites of bark beetles (Scolytidae) in southern Manitoba, with descriptions of three new species of Sulphuretylenchus Rühm (Nematoda: Allantonematidae)
Thirty-one species of bark beetles were collected from nine genera of host plants at 29 locations in southern Manitoba during 1980–1983. Of these bark beetle species, 21 were infected by as many as 56 species of nematodes, based on examination of adult and juvenile stages. There were 30 species of allantonematids, all recovered from the hosts' haemocoel. Fourteen rhabditid species were recovered from the alimentary tract of 15 host species. Twelve aphelenchoids were found in both the haemocoel (of 10 host species) and the Malpighian tubules (of 2 host species). Three new species of Sulphuretylenchus are described. Sulphuretylenchus pseudoundulatus sp.nov. parasitized Polygraphus rufipennis (Kirby) collected in the Whiteshell Provincial Forest. Sulphuretylenchus nopimingi sp.nov. parasitized Pityokteines sparsus (LeConte) collected in Nopiming Provincial Park. Sulphuretylenchus posteruteri sp.nov. parasitized Ips perroti Swaine in the Belair Provincial Forest.