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Effects of pitch canker pathogen on gallery excavation and oviposition by Ips paraconfusus (Coleoptera: Scolytidae)

Published online by Cambridge University Press:  31 May 2012

Andrew J. Storer ,
David L. Wood  and
Thomas R. Gordon
Andrew J. Storer*
Affiliation:
Division of Insect Biology, University of California, Berkeley, California, United States 94720
David L. Wood
Affiliation:
Division of Insect Biology, University of California, Berkeley, California, United States 94720
Thomas R. Gordon
Affiliation:
Department of Plant Pathology, University of California, Davis, California, United States 95616
*
1 Corresponding author (e-mail: storer@mtu.edu).
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Abstract

Ips paraconfusus Lanier is a vector of the pitch canker fungus, Fusarium circinatum Nirenberg and O’Donnell, in California. Multiple infections of Monterey pine, Pinus radiata D. Don. (Pinaceae), branches and main stems appear to predispose trees to infestation by I. paraconfusus. The effect of cankers produced in response to F. circinatum on oviposition and gallery construction was investigated. Introduction of beetles into artificially induced or naturally occurring cankers was less likely to result in oviposition and resulted in shorter galleries than introductions into logs without cankers. Of all adults that produced eggs, the mean number of eggs per adult was no different in logs with cankers than in canker-free logs; however, the distance across the grain from the introduction point to the first egg was greater for adults introduced into cankers than for adults introduced away from cankers. These results indicate that the pitch canker pathogen has a negative effect on I. paraconfusus, as cankers produced in response to the pathogen are unsuitable for exploitation by the insect.

Résumé

Ips paraconfusus Lanier est un vecteur du champignon pathogène qui cause le chancre fusarien du pin, Fusarium circinatum Nirenberg et O’Donnell, en Californie. Les infections multiples sur les branches et les rameaux principaux du pin de Monterey, Pinus radiata D. Don. (Pinaceae), semblent prédisposer les arbres aux infestations d’ I. paraconfusus. La présence des chancres apparus en réaction au pathogène affectent apparemment la ponte et la construction de tunnels. Les scolytes introduits dans des chancres naturels et des chancres provoqués artificiellement ont moins de chances de pondre que les scolytes introduits dans des troncs sains et leurs tunnels sont plus courts. Chez tous les adultes qui produisent des oeufs, le nombre moyen d’oeufs par adulte est le même dans les troncs sains et dans les troncs malades; cependant, la distance entre le point de transmission de la maladie et le premier oeuf, mesurée perpendiculairement au grain du bois, est plus grande chez les adultes introduits dans les chancres que chez ceux qui sont insérés loin des chancres. Ces résultats indiquent que le pathogène responsable du chancre fusarien du pin a un effet négatif sur I. paraconfusus parce que les chancres apparus en réaction au pathogène ne peuvent être exploités par le scolyte.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 4 , August 2002 , pp. 519 - 528
Copyright
Copyright © Entomological Society of Canada 2002

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