Plant Disease · 1994 · 31 citations · 0 references
AgricultureCrop SciencesPlant PathologyBacterial Plant PathologyBreeding For Disease ResistancePlant GeneticsDisease ResistanceDisease Resistance EvaluationDisease Resistance GeneticsPlant Disease ResistanceResistance GenesResistant Crop VarietiesBacterial Blight ResistanceCultivar ResistanceDisease Incidence PatternsDisease Progress Curve AnalysisDisease Progress MeasurementDisease Severity EstimationPlant Disease Resistance GenesPlant Resistance Genes
Progress of bacterial blight of rice, caused by Xanthomonas oryzae pv. oryzae, was studied in the Philippines by planting six rice cultivars (IR24, IR36, IR54, IR60, IR64, and IR1695) carrying different Xa genes for resistance during the 1988 and 1990 seasons. Four epidemiological parameters, 1) disease incidence, 2) disease severity, J) area under the disease progress curve (AUDPC), and 4) apparent infection rate (r), were used to rank rice cultivars'resistance to X. o. oryzae. The susceptible check IR24 and resistant check IR1695 differed greatly in reaction to X. o. oryzae in the field during the 2-yr study. In the field, IR36, IR54, IR60, and IR64 showed high levels of resistance to X. o. oryzae compared with IR24