Hostname: page-component-76fb5796d-zzh7m Total loading time: 0 Render date: 2024-04-26T11:33:57.930Z Has data issue: false hasContentIssue false
  • English
  • Français

WITHIN-TREE DISTRIBUTIONS AND SEASONALITY OF IMMATURE STAGES OF THE BRONZE BIRCH BORER, AGRILUS ANXIUS (COLEOPTERA: BUPRESTIDAE)1

Published online by Cambridge University Press:  31 May 2012

Cynthia R. Loerch  and
E. Alan Cameron
Cynthia R. Loerch
Affiliation:
Department of Entomology, The Pennsylvania State University, University Park 16802
E. Alan Cameron
Affiliation:
Department of Entomology, The Pennsylvania State University, University Park 16802
Get access Rights & Permissions [Opens in a new window]

Abstract

Distributions of immature stages of the bronze birch borer, Agrilus anxius Gory (Coleoptera: Buprestidae), infesting young European white birch, Betula pendula Roth, were studied on a surface mine reforestation site in Pennsylvania. Eggs of A. anxius were common on boles of trees from mid-June through mid-August, in clusters of up to 14 eggs. Almost 70% of the eggs were in crevices in the dark triangular patch at branch origins. Larvae were present throughout the year. Fourth instars comprised 93.1% of the overwintering population.

Vertical distributions of eggs, larvae, and pupae along the bole were random relative to available surface area. Consequently, each stage was more abundant on the lower half than on the upper half of trees. Eggs and first instars were concentrated on the northeast, or shaded, side of trees. Second and third instars were distributed randomly around the bole. Fourth instars overwintered and pupated primarily on the southwest aspect.

Résumé

La distribution des stades immatures de l'agrile du bouleau, Agrilus anxius Gory (Coleoptera : Buprestidae) infestant le bouleau européen Betula pendula Roth, a été étudiée sur un site d'exploitation minière à ciel ouvert en reboisement localisé en Pensylvanie. Les oeufs d'A. anxius étaient abondants sur les troncs d'arbres de la mi-juin à la mi-août, en masses comptant jusqu'à 14 oeufs. Presque 70% des oeufs se trouvaient dans les crevaces de la tache triangulaire foncée située à la base des branches. Les larves étaient présentes tout au long de l'année. Les stades quatre comptaient pour 93.1% de la population hivernante.

La distribution verticale des oeufs, des larves et des pupes le long du tronc s'est révélée aléatoire par rapport à la surface disponible. En conséquence, tous les stades étaient plus abondants sur la moitié inférieure que sur la moitié supérieure de l'arbre. Les oeufs et les stades un étaient concentrés sur le côté nord-est ou ombragé de l'arbre. Les stades deux et trois étaient distribués aléatoirement autour du tronc. Les stades quatre ont hiverné et se sont empupés surtout du côté sud-ouest.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 2 , February 1984 , pp. 147 - 152
Copyright
Copyright © Entomological Society of Canada 1984

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Balch, R. E. and Prebble, J. S.. 1940. The bronze birch borer and its relation to the dying of birch in New Brunswick forests. For. Chron. 16: 179–201.Google Scholar
Ball, J. 1979. Interactions of bronze birch borer (Agrilus anxius Gory) and European white birch (Betula pendula Roth) populations in urban environments. M.S. Thesis, Michigan State University, East Lansing. v + 49 pp.Google Scholar
Ball, J. and Simmons, G.. 1980. The relationship between bronze birch borer and birch dieback. J. Arbor. 6: 309–314.Google Scholar
Barter, G. W. 1957. Studies of the bronze birch borer, Agrilus anxius Gory, in New Brunswick. Can. Ent. 89: 16–36.Google Scholar
Barter, G. W. 1965. Survival and development of the bronze poplar borer Agrilus liragus Barter & Brown (Coleoptera: Buprestidae). Can. Ent. 97: 1063–1068.CrossRefGoogle Scholar
Batschelet, E. 1965. Statistical Methods for the Analysis of Problems in Animal Orientation and Certain Biological Rhythms. Am. Inst. Biol. Sci., Wash., D.C.57 pp.Google Scholar
Carlson, R. W. and Knight, F. B.. 1969. Biology, taxonomy, and evolution of four sympatric Agrilus beetles (Coleoptera: Buprestidae). Contrib. Am. ent. Inst. 4: 1–105.Google Scholar
Chapman, R. N. 1915. Observations on the life history of Agrilus bilineatus. J. agric. Res. 3: 283–297.Google Scholar
Larsen, J. 1901. A disease of the white birch. 3rd Rep. Mich. Acad. Sci. Arts and Letters. pp. 46–49.Google Scholar
Loerch, C. R. 1983. Instar determination, within-tree distribution, and natural enemies of immatures of the bronze birch borer, Agrilus anxius Gory (Coleoptera: Buprestidae), in Pennsylvania. M.S. Thesis, The Graduate School, The Pennsylvania State University, University Park. ix + 74 pp.CrossRefGoogle Scholar
Loerch, C. R. and Cameron, E. A.. 1983. Determination of larval instars of the bronze birch borer, Agrilus anxius (Coleoptera: Buprestidae). Ann. ent. Soc. Am. 76: 948–952.CrossRefGoogle Scholar
Nash, R. W., Duda, E. J., and Gray, N. H.. 1951. Studies on extensive dying, regeneration, and management of birch. Maine For. Serv. Bull. 15. 82 pp.Google Scholar