VIEW ARTICLE

Ecology and Epidemiology

Relationships Among Inoculum Density, Microsclerotium Size, and Inoculum Efficiency of Cylindrocladium crotalariae Causing Root Rot on Peanuts. M. C. Black, Research assistant, Department of Plant Pathology, North Carolina State University, Raleigh 27650; M. K. Beute, professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. Phytopathology 74:1128-1132. Accepted for publication 10 April 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-1128.

Relationships between root rot severity on peanut (Arachis hypogaea) and inoculum density of Cylindrocladium crotalariae for different microsclerotia size categories were examined in greenhouse studies. Root rot severity at the same inoculum density was more severe for large microsclerotia (>150 μm minimum dimension). Cropping sequences of susceptible and resistant peanuts and of soybeans in infested field microplots for 2 or 4 yr did not consistently result in different microsclerotial sizes. On the average, microsclerotia in microplots were larger at low inoculum densities than at high inoculum densities.