Geographic Variation in Melampsora Rust Resistance in Eastern Cottonwood in the Lower Mississippi Valley

Abstract

Eastern cottonwood clones originating from 36 young natural stands along the Mississippi River from Memphis, Tennessee, to Baton Rouge, Louisiana, were evaluated in a nursery near Greenville, Mississippi for resistance to Melampsora rust. In general, the northern sources had more rust and were more variable in rust susceptibility than the southern sources. Eleven percent of the clones from the 6 northernmost sources and 0.5 percent of the clones from the 24 southernmost sources appeared to be highly resistant to rust. Clones with slightly less rust resistance were about evenly distributed over the geographic range.

Citation

Cooper, D. T.; Filer, T. H. 1976. Geographic Variation in Melampsora Rust Resistance in Eastern Cottonwood in the Lower Mississippi Valley. In: Proceedings of the Tenth Central States Forest Tree Improvement Conference. 146-151.