Open AccessAsh Yellows in Zion National Park: Impact, Identity of Pathogen, Mode of Spread, and Prospects for Management
Author(s) -
W. A. Sinclair,
Michael Treshow,
Robert H. Davis
Publication year - 1991
Publication title -
annual report
Language(s) - English
Resource type - Journals
eISSN - 2693-2407
pISSN - 2693-2385
DOI - 10.13001/uwnpsrc.1991.3049
Subject(s) - canyon , national park , fraxinus , velvet , cave , geography , outbreak , archaeology , ecology , biology , geology , cartography , virology , oceanography
Velvet ash (Fraxinus velutina) in Zion Canyon have declined in vigor, and some are dying. This species is aesthetically and ecologically important in the canyon, because it is one of only three tree species that commonly grow to large size on the canyon floor. Ash yellows (AshY), a disease caused by unnamed mycoplasmalike organisms (MLOs), is common in velvet ash in Zion Canyon and is suspected to contribute to the decline of this species. This project deals with the ecology and epidemiology of ash yellows and possibilities for managing it in Zion National Park (ZNP).