VIEW ARTICLE

Effects of Plant Age Upon Development of Necrosis and Occurrence of Intraxylem Sclerotia in Soybean Infected with Macrophomina phaseolina. M. B. Ilyas, Graduate Student, Department of Plant Pathology, University of Illinois, Urbana 61801; J. B. Sinclair, Professor, Department of Plant Pathology, University of Illinois, Urbana 61801. Phytopathology 64:156-157. DOI: 10.1094/Phyto-64-156.

Soybean (Glycine max) plants up to 60 days of age were wound-inoculated at 10-day intervals with mycelium of Macrophomina phaseolina (Rhizoctonia bataticola). Pith necrosis increased significantly with each increase in plant age. Intraxylem sclerotia were produced in stems of 30-, 40-, 50-, and 60-day-old plants. Symptoms of charcoal rot in soybean have been attributed to enzymes and toxin production. Data reported here indicate that sclerotia in xylem vessels also contribute to wilting and death of infected plants.