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Laboratory evaluation of flight activity of Dendroctonus armandi (Coleoptera: Curculionidae: Scolytinae)

Published online by Cambridge University Press:  02 April 2012

Hui Chen ,
Zhen Li  and
Ming Tang
Hui Chen*
Affiliation:
College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling, Shaanxi 712100, People's Republic of China
Zhen Li
Affiliation:
College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling, Shaanxi 712100, People's Republic of China
Ming Tang
Affiliation:
College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling, Shaanxi 712100, People's Republic of China
*
1 Corresponding author (e-mail: chenhui@nwsuaf.edu.cn).
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Abstract

Dendroctonus armandi Tsai and Li is an important native pest of Chinese white pine (Pinus armandii Franch. (Pinaceae)) in the Qinling Mountains of Shaanxi Province, People's Republic of China. Populations can reach epidemic levels and cause widespread mortality of trees in forest ecosystems. We studied the flight behaviour of D. armandi collected under controlled conditions using a flight-mill system to gather information to aid in its management. Our results indicate that D. armandi has three distinct flight patterns (intermittent flight, short-burst flight, and sustained uninterrupted flight). There were no significant differences in flight performance between males and females. Median daily values for total distance traveled, total flight time, and maximum uninterrupted flight time were 275.1 m day−1, 815 s day−1, and 40 s day−1, respectively (n = 148). Individuals displayed positive phototactic behaviour: total flight distance and total flight time were greater under artificial illumination than in natural light or darkness. The level of flight activity increased throughout the morning, remained high during the afternoon (1400–1600), dropped considerably at 1800, and was lowest at midnight. There was no significant difference in flight distance or flight time between the first and second generations. From the data collected, it is clear that the phototactic response is an important factor in the flight behaviour of D. armandi and may influence its spatial dispersal.

Résumé

Dendroctonus armandi Tsai et Li est un ravageur important du pin d'Armand (Pinus armandii Franch. (Pinaceae)) dans les monts Qinling de la province de Shaanxi, Chine. Les populations peuvent atteindre des densités épidémiques et provoquer une mortalité générale des arbres dans les écosystèmes forestiers. Nous étudions le comportement de vol de D. armandi gardés dans des conditions contrôlées à l'aide d'un tunnel de vol afin d'obtenir des renseignements utiles à sa gestion. Il y a trois patrons distincts de vol chez D. armandi (vol intermittent, envolée courte et saccadée et vol continu et ininterrompu). Il n’y a pas de différence significative entre les performances de vol des mâles et des femelles. Les valeurs médianes journalières des distances parcourues, de la durée totale du vol et de la durée maximale de vol ininterrompu sont respectivement de 275,1 m jour−1, 815 s jour−1 et 40 s jour−1 (n = 148). Les individus de S. armandi possèdent un comportement de phototaxie positive dans lequel la distance totale de vol et la durée totale de vol sont plus importantes en conditions d'illumination artificielle qu’en lumière naturelle ou à l'obscurité. L’activité de vol augmente au cours de la matinée, reste élevée durant l'après-midi (14h00–16h00), diminue considérablement à 18h00 et est minimale à minuit. Il n’y a pas de différence significative entre les distances de vol et les durées de vol de la première et de la seconde génération. D’après nos données, il est clair que la réaction de phototaxie est un facteur important dans le comportement de vol chez D. armandi et qu’elle peut influencer sa répartition spatiale.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 142 , Issue 4 , August 2010 , pp. 378 - 387
Copyright
Copyright © Entomological Society of Canada 2010

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