A severe epidemic of Marssonina leaf blight on quaking aspen in Northern Utah

Roy O. Harniss; David L. Nelson

doi:10.2737/INT-RN-339

Treesearch

A severe epidemic of Marssonina leaf blight on quaking aspen in Northern Utah

Informally Refereed

Authors:

Roy O. Harniss, David L. Nelson

Year:

1984

Type:

Research Note

Station:

Rocky Mountain Research Station

DOI:

https://doi.org/10.2737/INT-RN-339

Source:

Research Note INT-339. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 6 p.

Download (PDF 1.79 MB)

Download (PDF 1.79 MB): https://research.fs.usda.gov/download/treesearch/36585.pdf

Abstract

The extent of Marssonina leaf blight (Marssonina populi) on quaking aspen (Populus tremuloides) was observed in northern Utah and adjacent States in 1981 aand 1982. Area of the epidemic and symptoms of the disease are described. On 1,000 acres (405 hal) in northern Utah, infection levels were 6 percent slight, 12 percent light, 32 percent moderate, 16 percent moderately heavy, and 34 percent heavy.

Keywords

aspen leaf blight, Populus tremuloides, epidemiology, symptoms

Citation

Harniss, Roy O.; Nelson, David L. 1984. A severe epidemic of Marssonina leaf blight on quaking aspen in Northern Utah. Research Note INT-339. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 6 p.