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EVALUATION OF MONOSODIUM METHANE ARSENATE FOR THE SUPPRESSION OF NATIVE ELM BARK BEETLES, HYLURGOPINUS RUFIPES (EICHHOFF) (COLEOPTERA: SCOLYTIDAE)

  • I.L. Pines (a1) and A.R. Westwood (a1)

Abstract

The native elm bark beetle, Hylurgopinus rufipes (Eichhoff), is the major vector of Dutch elm disease, Ophiostoma ulmi (Buisman) Nannf., in Manitoba. The herbicide Glowon™, monosodium methane arsenate (MSMA), was applied to a chainsaw cut in American elm, Ulmus americana L., tree stems to determine if the treated elms would become effective trap trees for H. rufipes. Three treatments were compared: treated with herbicide and girdled, girdled, and control. All herbicide-treated elms died within 18 days after application. Significantly higher numbers (P < 0.01) of native elm bark beetles were attracted to the herbicided elms, compared with the other treatments. Beetles bred only in the elms treated with herbicide. Of the total brood galleries constructed, 72% had no egg hatch while the remaining 28% had larval tunnels. Progeny adults emerged from less than 1% of the larval tunnels. MSMA application could supplement the Dutch elm disease management program in Manitoba.

Le Scolyte de l’orme, Hylurgopinus rufipes (Eichhoff), est le principal vecteur de la maladie hollandaise de l’orme, Ophiostoma ulmi (Buisman) Nannf., au Manitoba. Nous avons badigeonné d’un herbicide, le Glowon™, de l’arsénate de méthane monosodique (MSMA), des entailles à la scie à chaîne faites dans des tiges d’ormes, Ulmus americana L., afin de vérifier si ces arbres pourraient servir d’appâts efficaces pour les scolytes. Trois formes de traitement ont été comparées : certains arbres ont été entaillés et traités à l’herbicide, d’autres ont été seulement entaillés, d’autres ont servi de témoins. Tous les ormes traités à l’herbicide sont morts moins de 18 jours après l’application. Des nombres significativement plus élevés (P < 0,01) de scolytes ont été attirés vers les ormes traités à l’herbicide que vers les autres ormes. Les scolytes ne se sont reproduits que dans les arbres traités à l’herbicide. Parmi toutes les galeries de ponte construites, 72% ne contenaient pas d’oeufs éclos et les autres 28% contenaient des tunnels larvaires. Moins de 1% des tunnels larvaires ont produit des adultes. L’application de MSMA peut donc s’avérer utile dans les programmes d’éradication de la maladie hollandaise de l’orme au Manitoba.

[Traduit par la Rédaction]

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References

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EVALUATION OF MONOSODIUM METHANE ARSENATE FOR THE SUPPRESSION OF NATIVE ELM BARK BEETLES, HYLURGOPINUS RUFIPES (EICHHOFF) (COLEOPTERA: SCOLYTIDAE)

  • I.L. Pines (a1) and A.R. Westwood (a1)

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