RHIZOCTONIA RUBI SP. NOV. ASSOCIATED WITH THE DRY-BERRY DISEASE OF THE LOGANBERRY

Abstract

Rhizoctonia rubi sp. nov., which was isolated from incipient lesions on loganberry and Boysenberry dry-berry fruit, is described. This fungus was obtained, without exception, from diseased fruit of both, hosts and for several reasons is believed to be the primary cause of the destructive dry-berry disease on the Pacific coast of North America. The history, importance and symptoms of the dry-berry disease are given. This disease is clearly distinguished from anther and stigma blight, caused by Haplosphaeria deformans, with which it has been confused.