Entomophaga

, Volume 30, Issue 2, pp 121–124 | Cite as

Susceptibility of two Coconut Pests,Oryctes rhinoceros [Col.: Scarabaeidae] andTirathaba rufivena [Lep.: Pyralidae], to the entomoparasitic nematodeSteinernema feltiae [= Neoaplectana carpocapsae]

  • B. Zelazny
Article

Abstract

Bioassay indicated that 1 st instar larvae ofOryctes rhinoceros are resistant to infections by the nematodeSteinernema feltiae (estimated LD50: 90 nematodes) but thatTirathaba rufivena larvae larger than 15 mm are highly susceptible (estimated LD50: 3 nematodes). The “All” strain and the “mexican” strain ofS. feltiae gave very similar responses. In a field trial 300,000 nematodes were sprayed on each of 25 palms to controlT. rufivena. Although some mortality from nematodes was observed, the treatment failed to reduce the pest population significantly.

Key-Words

Oryctes rhinoceros Scarabaeidae Tirathaba rufivena Pyralidae susceptibility to the entomoparasitic nematode Steinernema feltiae 

Résumé

L'essai biologique indique que les larves de premier stade deOryctes rhinoceros sont résistantes à l'infestation par la nématodeSteinernema feltiae (LD50: évaluée à 90 nématodes), mais que les larves duTirathaba rufivena d'une taille dépassant 15 mm sont très susceptibles (LD50: évaluée à 3 nématodes). Les souches “A{upll}” et “M{upexicaines}” deS. feltiae donnent des réponses très similaires. Au cours d'un essai en plein champ 300.000 nématodes ont été appliqués par arbre sur 25 palmiers en vue de lutter contreT. rufivena. Quoiqu'une certaine mortalité due aux nématodes ait été observée, le traitement n'a pas pu réduire d'une façon significative les populations du ravageur.

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References

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Copyright information

© Lavoisier Abonnements 1985

Authors and Affiliations

  • B. Zelazny
    • 1
  1. 1.PCA Albay Research CenterUNDP/FAO Coconut Pests and Diseases ProjectAlbayPhilippines

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