?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Frederickson%2C+D+E&rft.aufirst=D+E&rft.aulast=Frederickson&rft.pages=27-32&rft.atitle=Susceptibility+to+ergot+in+Zimbabwe+of+sorghums+tbat+remained+uninfected+in+their+native+climates+in+Ethiopia+and+Rwanda&rft.volume=43&rft.issue=1&rft.title=Plant+Pathology&rft.date=1994&rft.genre=article