Bioherbicidal Activity of (Formerly ) on Glyphosate-Resistant .

The effects of the bioherbicidal activity of the fungal phytopathogen, (AV), formerly , on glyphosate-resistant and -susceptible (horseweed) were examined in greenhouse and field studies. Spray applications of mycelial formulations of AV infected both glyphosate-resistant and -susceptible plants at various growth stages. Young plants in the rosette leaf stage of growth were controlled more efficaciously than were older plants that had bolted or that were in the inflorescence stage; nevertheless, severe injury and mortality also occurred in mature plants.