Abstract
Colletotrichum truncatum, a potential myco- herbicide for control of hemp sesbania, formed spon- taneous variants on agar medium. The predominant variant produced more spores than the wild type on potato dextrose agar but the wild type produced more spores on Czapek-Dox agar. Spore yield of both types was greatly reduced on Czapek-Dox. In liquid culture, the variant spontaneously arose and gradually dis- placed the wild type. Although the variant produced more spores in liquid culture, it had reduced viru- lence. Displacement of wild type strains by similar var? iants in liquid fermentation may constrain production of this mycoherbicide and should be considered dur? ing the preparation of C. truncatum inocula.
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