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INFLUENCE OF SUGAR MAPLE HEALTH ON FECUNDITY OF PEAR THRIPS IN MASSACHUSETTS

Published online by Cambridge University Press:  31 May 2012

E. Carey ,
R.G. Van Driesche ,
J.S. Elkinton ,
T.S. Bellows Jr.  and
C. Burnham
E. Carey
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, Massachusetts, USA01003
R.G. Van Driesche
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, Massachusetts, USA01003
J.S. Elkinton
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, Massachusetts, USA01003
T.S. Bellows Jr.
Affiliation:
Department of Entomology, University of California, Riverside, California, USA92521
C. Burnham
Affiliation:
Massachusetts Department of Environmental Management, Amherst, Massachusetts, USA01002
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Abstract

Widespread defoliation of sugar maple stands due to pear thrips, Taeniothrips inconsequens (Uzel), feeding occurred in Massachusetts in 1987 and 1988. To assess the role of tree health as a possible cause of these outbreaks, an experiment was conducted in sugar maple stands in Massachusetts in 1990. Sleeve cages were placed on mature sugar maples and stocked with adult female pear thrips to determine the relation between root starch reserves (an index of tree health) and thrips fecundity. The experiment was run at four sites, assessing both root starch levels and thrips fecundity on individual trees. Each stand showed a range from high to low starch values and trees at each end of the root starch index spectrum were selected for use in the experiment at each site. Analysis of data showed no differences between sites, apart from those linked to starch levels, and found thrips fecundity to be positively correlated with higher starch reserves. The results of this experiment do not support the original hypothesis that declining tree health was a causal factor in pear thrips outbreaks on sugar maple in Massachusetts.

Résumé

Une importante défoliation des forêts d’érables rouges due au Thrips du poirier, Taeniothrips inconsequens (Uzel), s’est produite au Massachusetts en 1987 et 1988. Une expérience a été mise au point dans des forêts d’érables rouges du Massachusetts en 1990 dans le but d’établir s’il existe un lien de causalité entre la santé des arbres et ces attaques. Afin d’évaluer la relation entre les réserves d’amidon des racines (un indice de la santé des érables) et la fécundité des thrips, nous avons placé des cages en forme de manchons sur des arbres à maturité et les avons garnies de femelles adultes de thrips. L’expérience a été menée en quatre endroits et les concentrations d’amidon dans les racines de même que la fécondité des thrips ont été estimées sur certains arbres en particulier : dans chaque forêt, les concentrations d’amidon des racines s’échelonnaient entre des valeurs hautes et des valeurs basse et des arbres ont été choisis à chaque extrémité du spectre des concentrations pour les expériences. L’analyse des données n’a pas mis en lumière de différences entre les forêts, sauf celles associées aux concentrations d’amidon, et la fécondité des thrips s’est avérée en corrélation positive avec les concentrations d’amidon les plus élevées. Les résultats des expériences ne corroborent donc pas l’hypothèse de départ, à savoir que la santé défaillante des arbres pourrait constituer un facteur déclencheur des attaques de Thrips du poirier sur les érables rouges au Massachusetts.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 6 , December 1992 , pp. 1129 - 1138
Copyright
Copyright © Entomological Society of Canada 1992

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