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TWIG FEEDING BY SCOLYTUS MULTISTRIATUS (COLEOPTERA: SCOLYTIDAE): WITHIN-TREE DISTRIBUTION AND USE FOR ASSESSMENT OF MASS TRAPPING1

Published online by Cambridge University Press:  31 May 2012

Robert J. Rabaglia  and
Gerald N. Lanier
Robert J. Rabaglia
Affiliation:
Department of Environmental and Forest Biology, SUNY College of Environmental Science and Forestry, Syracuse, New York 13210
Gerald N. Lanier
Affiliation:
Department of Environmental and Forest Biology, SUNY College of Environmental Science and Forestry, Syracuse, New York 13210
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Abstract

Twig-feeding injuries by S. multistriatus in juvenile white (or American) elms occurred primarily (61%) in the upper 1/3 of the crowns. Preferred feeding sites were crotches formed by the previous year's and current year's twig growth (both spring and summer) and by leaf petioles from current year's twig growth (summer only). An index of twig feeding appeared to reflect S. multistriatus population trends and was closely correlated with Dutch elm disease rates in Syracuse, N.Y., from 1978 to 1982. Twig-feeding indices and catches on sticky traps baited with S. multistriatus pheromone were generally correlated, but disparate when competing natural pheromone sources were abundant. Twig sampling indicated that S. multistriatus populations and disease rates were reduced by mass-trapping and trap-tree techniques. The twig-sampling method presented appears to be useful in predicting Dutch elm disease rates and assessing the effectiveness of measures to control its beetle vector.

Résumé

Les blessures causées aux tigettes de jeunes ormes américains par le S. multistriatus étaient situées principalement (61%) dans le tiers supérieur des couronnes. Les sites préférés étaient les fourches formées par les tigettes de l'année courante (au printemps et à l'automne) et par les pétioles des feuilles des tigettes de l'année courante (en été seulement). Un indice de l'activité alimentaire sur les tigettes a semblé réfléter les fluctuations des populations du S. multistriatus et était étroitement corrélé aux taux d'infestation par la maladie hollandaise de l'orme à Syracuse, N.Y., entre 1978 et 1982. Les indices d'activité alimentaire sur les tigettes et les captures par pièges englués appâtés avec le phéromone du S. multistriatus étaient généralement corrélés, mais la relation était disparate en présence de sources de phéromone naturelle. L'échantillonnage des tigettes a indiqué que les populations du S. multistriatus et l'incidence de la maladie ont été réduites par les techniques de la capture en masse et de l'arbre-piège. La méthode d'échantillonnage des tigettes présentée semble utile pour prédire les incidences de la maladie hollandaise et pour évaluer l'efficacité des mesures de lutte contre le coléoptère vecteur.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 7 , July 1984 , pp. 1025 - 1032
Copyright
Copyright © Entomological Society of Canada 1984

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