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RELATION BETWEEN ATTACK BY XYLOSANDRUS GERMANUS (COLEOPTERA: SCOLYTIDAE) AND DISEASE SYMPTOMS IN BLACK WALNUT1

Published online by Cambridge University Press:  31 May 2012

B.C. Weber  and
J.E. McPherson
B.C. Weber
Affiliation:
North Central Forest Experiment Station, Forestry Sciences Laboratory, Southern Illinois University, Carbondale, Illinois, USA 62901
J.E. McPherson
Affiliation:
Department of Zoology, Southern Illinois University, Carbondale, Illinois, USA 62901
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Extract

Xylosandrus germanus (Blandford) (Coleoptera: Scolytidae) is an ambrosia beetle that occurs in Japan, Korea, the Kuril Islands, Vietnam, Taiwan, China, Central Europe, and the United States (Nobuchi 1981). Unlike most ambrosia beetles, it will attack apparently healthy trees and those that are dying or recently dead (Weber 1982). It has been associated with plants infected with pathogenic fungi, including black walnut (Juglans nigra L.) infected with species of Fusarium (Anderson and Hoffard 1978; Kessler 1974); reported symptoms include cankers, wilting and dieback, and sprouts. We found black walnut with wilting and dieback symptoms in southern Illinois in spring 1978 and central Tennessee in spring 1980. Subsequent examinations showed that X. germanus was present and apparently closely associated with the disease symptoms because of the number of diseased trees that also contained X. germanus pinholes. Therefore, we decided to study the relation between X. germanus attack and disease symptoms in black walnut.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 10 , October 1985 , pp. 1275 - 1277
Copyright
Copyright © Entomological Society of Canada 1985

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References

Anderson, R.L., and Hoffard, W.H.. 1978. Fusarium canker-ambrosia beetle complex on tulip popular in Ohio. Plant Dis. Rep. 62: 751.Google Scholar
Kessler, K.J. Jr., 1974. An apparent symbiosis between Fusarium fungi and ambrosia beetles causes canker on black walnut stems. Plant Dis. Rep. 58: 1044–1047.Google Scholar
Nobuchi, A. 1981. Studies on Scolytidae XXIII. The ambrosia beetles of the genus Xylosandrus Reitter from Japan (Coleoptera). Forest. For. Prod. Res. Inst. Bull. 314: 27–37.Google Scholar
Weber, B.C. 1982. The biology of the ambrosia beetle Xylosandrus germanus (Blandford) (Coleoptera: Scolytidae) and its effects on black walnut. Ph.D. dissertation, Southern Illinois University, Carbondale, Illinois. 222 pp.Google Scholar