Entomophaga

, Volume 34, Issue 3, pp 341–349 | Cite as

Secondary transmission of a nuclear polyhedrosis virus ofNeodiprion taedae linearis [Hym.: Diprionidae] between larval colonies on loblolly pine

  • S. Y. Young
  • W. C. Yearian
Article

Abstract

Transmission of a nuclear polyhedrosis virus (NtNPV) of the loblolly pine sawfly,Neodiprion taedae linearis Ross was examined in larval populations on loblolly pine. NtNPV infection of larvae in one colony resulted in transmission to other colonies in the tree. Mortality in untreated colonies was highest when the treated and untreated colonies were located in the upper canopy and when small larvae were treated with virus (42.6–61.9%). Levels of mortality from NtNPV in the untreated colonies were low (2.8–25.0%) when the treated colony was located low in the canopy. Larvae from untreated colonies in the tree were usually large at death. Mortality in untreated larval colonies collected from nearby trees was much less (0.0–27.7%) than that in the trees containing the treated colony.

Key-Words

nuclear polyhedrosis virus Neodiprion taedae linearis loblolly pine sawfly virus transmission 

Résumé

La transmission d'un virus de la polyédrose nucléaire (NtNPV) duNeodiprion taedae linearis Ross dans des populations larvaires a été examinée sur le pin «taeda». L'infection des larves par le virus dans une colonie avait pour résultat la transmission du virus à d'autres colonies dans l'arbre. La mortalité dans les colonies non-traitées était la plus élevée lorsque les colonies traitées et non-traitées étaient localisées dans la plus haute partie de la frondaison et lorsque les petites larves étaient traitées avec le virus (42.6–61.9%). Les taux de mortalité provenant du NtNPV dans les colonies non-traitées étaient faibles (2.8–25.0%) lorsque la colonie traitée était localisée dans la partie inférieure de la frondaison. Généralement, les larves des colonies non-traitées étaient de grande taille. La mortalité parmi les colonies de larves non-traitées, récoltées dans les arbres du voisinage, était significativement moins élevée (0–27.7%) que celle des arbres qui contenaient la colonie traitée.

Mots Clés

Virus de la polyédrose nucléaire Neodiprion taedae linearis Pinus taeda Tenthrède transmission du virus 

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Copyright information

© Lavoisier Abonnements 1989

Authors and Affiliations

  • S. Y. Young
    • 1
  • W. C. Yearian
    • 1
  1. 1.Department of EntomologyUniversity of ArkansasFayettevilleUSA

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