Charmingly warm weather coaxed roses into bloom early this year, which means dealing with the usual diseases and pests earlier, too. When it comes to one of the county's most popular perennial plants, the "big four" vexations are powdery mildew, black spot, rust and aphids, according to Jay W. Pscheidt, a plant pathology specialist with Oregon State University's Extension Service.
Horticulture extension publications, Department of Plant Pathology, The University of Kentucky. Midwest Grape Production Guide. http://www.ca.uky.edu/agcollege/plantpathology/ext_files/PPFShtml/mw_grape_12aug05.pdf
Cucumber mosaic virus is one of the most common plant viruses causing yellow mottling, distorted leaves and stunted growth in a wide range of garden plants, not just cucumbers. Destroy suspect plants promptly to reduce the risk of transmission.
UC Berkeley Forest Pathology and Mycology Laboratory - Lead by Dr. Matteo Garbelotto