Nematodes associated with Ips cembrae (Coleoptera: Curculionidae): comparison of generations, sexes and sampling methods

• Published in: Journal of applied entomology (1986) Vol. 140; no. 5; pp. 395 - 403
• Main Authors: Grucmanova, S, Holusa, J, Cermak, V, Nermu, J
• Format: Journal Article
• Language: English
• Published: Berlin John Wiley & Sons, Ltd 01.06.2016; Blackwell Publishing Ltd; Wiley Subscription Services, Inc
• Subjects: Bursaphelenchus; Coleoptera; Contortylenchus; Cryptaphelenchus; Curculionidae; Ips cembrae; Laimaphelenchus; Laimaphelenchus penardi; Larix; Micoletzkya; mites; Nematoda; Scolytidae; Czech Republic
• ISSN: 0931-2048; 1439-0418
• DOI: 10.1111/jen.12269

A study of nematodes associated with the large larch bark beetle Ips cembrae (Heer 1836) was carried out at three locations in the Czech Republic. The proportion of beetles infested by endoparasitic nematodes (representatives of genera Contortylenchus, Parasitylenchus, Cryptaphelenchus and Parasitorhabditis) ranged from 29.9 to 50.9%. Significant differences were determined in nematode infestation levels among locations, generations and sampling methods. No differences were found in infestation rates between males and females. The percentage of bark beetles with phoretic nematodes ranged from 18 to 42.9%. Phoretic nematodes directly found under elytra, on wings and between body segments of the bark beetles belong to the genus Micoletzkya. However, adults and juveniles of other two phoretic species Laimaphelenchus penardi and Bursaphelenchus sp. were found in the gallery frass of I. cembrae. Infestation by phoretic nematodes positively correlated with the presence of mites under elytra.