Skip to Main Content
Etiology of bronze leaf disease of PopulusAuthor(s): Jason A. Smith; R. A. Blanchette; M. E. Ostry; N. A. Anderson
Source: The American Phytopathological Society 86(5):462-469
Publication Series: Scientific Journal (JRNL)
Station: North Central Research Station
PDF: View PDF (1.44 MB)
DescriptionBronze leaf disease is a potentially destructive disorder of the Populus section of the genus Populus. The causal agent has been reported to be Apioplagiostoma populi (anarnorph: Discula sp.). Based on etiological and symptomological studies, field observations of symptom development suggest that the pathogen moves systemically in the host. This was verified by graft experiments where symptoms progressed from the scion into the elongating stem. A bronze-pigmented vascular discoloration was observed in symptomatic leaves and branches. Dieback of affected stems also was common. Spore-trap studies elucidated the timing and necessary weather conditions of A. populi ascospore dispersal in relation to infection and symptom development. Exposure-tree experiments revealed that ascospores of A. populi are the primary inoculum and resulting infection causes distinctive disease symptoms on affected trees. Perithecia of A. populi were observed on overwintered symptomatic leaves, but were not observed on asymptomatic leaves. Acervular conidiomata were observed on symptomatic leaves during August and September. Although A. populi ascospores germinated in vitro, A. populi was not recovered from symptomatic tissue. Isolations from diseased leaves consistently yielded Epicoccum nigrum, but the role of this species is unclear. Inoculations of susceptible plants with E. nigrum conidia failed to reproduce symptoms, but inoculations with ascospores of A. populi produced symptoms typical of bronze leaf disease and Koch's postulates were performed.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationSmith, Jason A.; Blanchette, R. A.; Ostry, M. E.; Anderson, N. A. 2002. Etiology of bronze leaf disease of Populus. The American Phytopathological Society 86(5):462-469
KeywordsAscomycetes, aspen, Diaporthales, disease resistance, Leuce section, systemic fungi
- Growth and biomass of Populus irrigated with landfill leachate
- Effect of Alnus glutinosa on hybrid populus growth and soil nitrogen concentration in a mixed plantation
- Some implications of populus intensive culture on nongame birds
XML: View XML