Volume 60, Number 1 Search All Journals Search for: Back to Issue Diversity of Alternaria alternata, causal agent of Alternaria leaf spot of sugar beet. View Article PDF Back to Issue Post navigation Development of a reliable greenhouse screen for Rhizoctonia Crown and Root Rot to identify resistant germplasm and develop a non-destructive rating method.Development of a reliable greenhouse screen for Rhizoctonia Crown and Root Rot to identify resistant germplasm and develop a non-destructive rating method.