Assertion: fungus's host | /r/HasProperty | the virulence of infection
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text: The fungus, therefore, has a wide host range and strains of R. solani may differ in the hosts they are able to infect, the virulence of infection, selectivity for a given host ranges from nonpathogenic to highly virulent, the temperature at which infection occurs, the ability to develop in lower soil levels, the ability to form sclerotia, the growth rate, and survival in a certain area.