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FACTORS INFLUENCING THE MORTALITY OF SCOLYTUS MULTISTRIATUS (COLEOPTERA: SCOLYTIDAE) IN ELM BRANCHES IN CALIFORNIA1

Published online by Cambridge University Press:  31 May 2012

Ann E. Hajek  and
Donald L. Dahlsten
Ann E. Hajek
Affiliation:
Division of Biological Control, University of California, Berkeley, USA 94720
Donald L. Dahlsten
Affiliation:
Division of Biological Control, University of California, Berkeley, USA 94720
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Abstract

Populations of Scolytus multistriatus (Marsham) from two areas of California were sampled in 1979 to investigate various factors influencing mortality. English-elm bolts (Ulmus procera Salisb.) ranging between 2.0 and 12.9 cm in diameter yielded mean mortalities from 49.1 to 86.0%. Mortality was highly correlated with egg density for branch samples from 7.0 to 12.9 cm in diameter. The minimum acceptable elm-branch diameter (2.8 cm) was attacked only during the first sampling period (mid-May to mid-June). Branch diameter, and therefore bark thickness, demonstrated a strong positive relationship with the density of S. multistriatus eggs, attacks, gallery lengths, and emerged adults. Gallery length density was positively correlated with attack density. At low attack densities in small-diameter branches, mean gallery lengths were shorter.

Résumé

Des populations du Scolytus multistriatus (Marsham) de deux localités de Californie ont été échantillonnées en 1979 afin d'en examiner certaines causes de mortalité. Des mortalités moyennes de 49,1 à 86,0 pour cent ont été observées sur les rameaux de l'orme anglais (Ulmus procera Salisb.) ayant un diamètre de 2,0 à 12,9 cm. On a constaté une très forte corrélation entre la mortalité et la densité des oeufs dans les échantillons de rameaux à diamètre compris entre 7,0 et 12,9 cm. Les rameaux à diamètre minimal (2,8 cm) acceptable pour l'oviposition n'ont été attaqués que lors de la première période d'échantillonnage (mi-mai à mi-juin). Le diamètre des rameaux et, donc, l'épaisseur de l'écorce, ont été prouvés avoir un relation positive très forte avec la densité des oeufs, les attaques, les longueurs des galeries et les adultes émergeants. Une corrélation positive existait entre la densité des longueurs des galeries et la densité des attaques. Les longueurs moyennes des galeries étaient plus courtes dans les rameaux à petit diamètre et à attaques de faibles densités.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 7 , July 1985 , pp. 819 - 828
Copyright
Copyright © Entomological Society of Canada 1985

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