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Microsphaeropsis amaranthi and Phomopsis amaranthicola are potential biological control agents for several Amaranthus species. In an effort to understand the initial infection processes with these pathogens, a study was conducted of the conidial germination and germ tube length (μm) on the weed leaf surfaces at 21°C and 28°C. Weeds included Amaranthus rudis, A. palmeri, A. powellii, A. retroflexus,...
Several plants in the genus Amaranthus are weeds in cropping systems throughout the world, and some biotypes have developed resistance to a number of herbicide families. In an effort to develop alternative, biologically based weed management tactics, studies were initiated to quantify the selective ability of two fungal organisms to several Amaranthus species. Response of weed seedlings to Microsphaeropsis...
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