VIEW ARTICLE

Longevity of Mycelium of Colletotrichum lindemuthianum in Hypocotyl Tissue of Resistant and Susceptible Bean Cultivars. K. Erb, Division of Plant Science, West Virginia University, Morgantown 26506, Present address of the senior author: Department of Biology, Hofstra University, Hempstead, N.Y. 11550; M. E. Gallegly(2), and J. G. Leach(3). (2)(3)Division of Plant Sciences, West Virginia University, Morgantown 26506. Phytopathology 63:1334-1335. Accepted for publication 9 April 1973. DOI: 10.1094/Phyto-63-1334.

The longevity of mycelium of Colletotrichum lindemuthianum in hypocotyl tissue of resistant and susceptible beans (Phaseolus vulgaris ‘Perry Marrow’ and ‘Red Kidney’, respectively) was investigated. The fungus was isolated from old hypocotyls of susceptible plants and from young and old hypocotyls of resistant plants up to 25 days after inoculation. Microscopic observation of apparently intact mycelium in stained hypocotyl sections supported these results which suggest that, under the conditions of our experiments, even in a physiologically resistant bean hypocotyl where small lesions develop, portions of the mycelium remain viable for extended periods of time after ingress.