Host Range and Virulence of<i>Colletotrichum truncatum,</i>a Potential Mycoherbicide for Hemp Sesbania (<i>Sesbania exaltata</i>)

Abstract

A previously unreported anthracnose disease incited by Colletotrichum truncatum was discovered on hemp sesbania seedlings in Washington County, Mississippi, in 1987. Hemp sesbania inoculated with 2×10 7 spores per milliliter in the greenhouse were killed within 7 days. Soybean cvs. Bragg, Bedford, and Hill developed small, necrotic leaf spots, but no further symptoms occurred after 3 wk. Several cultivars of cotton, rice, and 23 other plant species representing eight plant families were immune to disease, as measured by visual assessment(.)