Biology of sulphuretylenchus elongatus (nematoda

Sphaerulariidae), and its effect on its host, scolytus ventralzs (coleoptera: Scolytidae)

Muhammad Ashraf, A. A. Berryman

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The developmental stages of Szilphzretylenciuse lozgatus, an abundant nematode parasite of Scolytus ventralis, are described. The life cycle was generally synchronized with its host, nematode reproduction usually occurring in the adult beetle after it had attacked a new tree. Reproduction occasionally occurred in the host larva. In these cases encapsulation of some nematode eggs and larvae was observed and the host usually died. Free-living infective stage nematodes emerged from the host, mated in the bark beetle galleries, and the female nematode reinfected bark beetle larvae by penetrating the cuticle. Parasitism by S. elongatus caused delayed emergence, limited flight, and aberrant attack behavior by infected S. ventralis. Female bark beetles were sterilized by heavy infection and partially sterilized by light or moderate infection. The effects of parasitism on males was not as severe. Some egg and larval mortality was attributed to nematode attack, and adult survival was reduced by infection. Parasitism was slightly higher in female bark beetles. The incidence of parasitism decreased somewhat in the upper levels of the tree. Host density appeared to have little effect on per cent parasitism although the degree of superparasitism increased with host density.

Original languageEnglish (US)
Pages (from-to)197-213
Number of pages17
JournalThe Canadian Entomologist
Volume102
Issue number2
DOIs
StatePublished - Jan 1 1970

Fingerprint

Sphaerulariidae
Scolytus
Nematoda
Scolytidae
Beetles
nematode
parasitism
bark beetles
beetle
Coleoptera
Biological Sciences
bark
Scolytus ventralis
Larva
Reproduction
larva
Infection
infection
superparasitism
egg

ASJC Scopus subject areas

  • Structural Biology
  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Molecular Biology
  • Insect Science

Cite this

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title = "Biology of sulphuretylenchus elongatus (nematoda: Sphaerulariidae), and its effect on its host, scolytus ventralzs (coleoptera: Scolytidae)",
abstract = "The developmental stages of Szilphzretylenciuse lozgatus, an abundant nematode parasite of Scolytus ventralis, are described. The life cycle was generally synchronized with its host, nematode reproduction usually occurring in the adult beetle after it had attacked a new tree. Reproduction occasionally occurred in the host larva. In these cases encapsulation of some nematode eggs and larvae was observed and the host usually died. Free-living infective stage nematodes emerged from the host, mated in the bark beetle galleries, and the female nematode reinfected bark beetle larvae by penetrating the cuticle. Parasitism by S. elongatus caused delayed emergence, limited flight, and aberrant attack behavior by infected S. ventralis. Female bark beetles were sterilized by heavy infection and partially sterilized by light or moderate infection. The effects of parasitism on males was not as severe. Some egg and larval mortality was attributed to nematode attack, and adult survival was reduced by infection. Parasitism was slightly higher in female bark beetles. The incidence of parasitism decreased somewhat in the upper levels of the tree. Host density appeared to have little effect on per cent parasitism although the degree of superparasitism increased with host density.",
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