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REPRODUCTION AND SURVIVAL OF THE AMBROSIA BEETLE TRYPODENDRON LINEATUM (OLIV.) (COLEOPTERA: SCOLYTIDAE) IN DOUGLAS-FIR AND WESTERN HEMLOCK LOGS

  • T.L. Shore (a1), J.A. McLean (a2) and J.C. Zanuncio (a3)

Abstract

Spring-felled logs of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, and western hemlock, Tsuga heterophylla (Raf.) Sarg., were attacked by ambrosia beetles, Trypodendron lineatum (Oliv.), in the year after felling. By monitoring individual galleries it was determined that brood production was similar to that found in fall- and winter-felled logs. The sex ratio of the brood did not differ significantly from 1:1. Only beetles that had failed to establish successful galleries emerged during the "second" flight period. Significant linear relationships were found between frass weight and each of the following variables: number of egg niches, emerged adult progeny, and gallery length. Mortality in galleries in Douglas-fir and western hemlock logs, respectively, was found to be 9.4 and 12.4% between the egg and larval–pupal stage and 19.5 and 32.1% between the larval–pupal and adult stages.

Des grumes de douglas taxifolié (Pseudotsuga menziesii [Mirb.] Franco) et de pruche occidentale (Tsuga heterophylla [Raf.] Sarg.) abattues au printemps ont été envahies par le scolyte du bois (Trypodendron lineatum [Oliv.]) l’année suivant leur abattage. En surveillant les galeries une à une forées par les adultes, nous avons pu déterminer que la quantité de larves produites équivalait à celle observée dans les grumes abattues à l’automne et en hiver. Le taux de masculinité des larves ne s’écartait pas beaucoup de 1 : 1. Seuls les scolytes qui n’avaient pas réussi à faire éclore leurs oeufs dans leurs galeries en émergeaient pendant leur "deuxième" période de vol. Des relations linéaires significatives ont été établies entre le poids des chiures et chacune des variables suivantes : le nombre de niches aménagées pour les oeufs, la descendance adulte qui en sort et la longueur des galeries. D’après nos observations, 9,4 et 12,4% de ces petits coléoptères meurent respectivement dans les galeries forées dans le douglas taxifolié et dans la pruche occidentale entre leur stade d’oeuf et de larve–pupe et 19,5 et 32,1% entre les stades de larve–pupe et d’adulte.

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REPRODUCTION AND SURVIVAL OF THE AMBROSIA BEETLE TRYPODENDRON LINEATUM (OLIV.) (COLEOPTERA: SCOLYTIDAE) IN DOUGLAS-FIR AND WESTERN HEMLOCK LOGS

  • T.L. Shore (a1), J.A. McLean (a2) and J.C. Zanuncio (a3)

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