Not available – first paragraph follows: Prune brownline, a recently-recognized disease of prune trees, is widespread in northern California, causing considerable losses in Solano, Yolo, and El Dorado counties. The disease has also been found in Sutter, Tehama, Yuba, and Placer County orchards, but the extent of its occurrence in other California prune-growing areas has not been determined.

The authors acknowled the ussislance of D. H. Chaney, J. W. Osgood. and G. E. Veerkamp, UC Cooperative Extension.