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A REDESCRIPTION OF PARASITAPHELENCHUS OLDHAMIRÜHM, 1956 (NEMATODA : APHELENCHOIDIDAE) A PARASITE OF TWO ELM BARK BEETLES : SCOL YT US SCOL YT US AND S. M ULTISTRIAT US, TOGETHER WITH SOME NOTES ON ITS BIOLOGY BY D. J. HUNT and N. G. M. HAGUE Zoology Department, University of Reading, Reading, Berks., England The adult stages of Parasitaphelenchus oldhaini are described and illustrated for the first time. The life cycle and biology of the parasite are discussed, together with an assessment of its effect on the host bark beetles Scolytus scolytus and S. multistriatus. The J3 is the infective and moults to the J4 inside the beetle larvae. The J4 is found in the haemocoel of the beetle larvae, pupae and adults and for a short time in the gut and frass. The other stages are all found in the frass. Adult nematodes feed on fungal hyphae. Parasitaphelenchus oldhami Rühm, 1956 was first recorded from two scolytid beetles living beneath elm bark; Scolytus scolytus Fab. and S. multistriatus Marsh. by Oldham (1930). About 60 % of the adult beetles of both species contained juvenile nematodes in the haemocoel. Oldham also found a single adult parasite which he described and
Nematologica – Brill
Published: Jan 1, 1974
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