Fig. 4

The occurrence of three main rice diseases on multi-genotype varieties in different rice-planting regions. Disease indexes of rice blast (a), rice false smut (b) and rice bacterial blight (c). Six multi-genotype varieties (DJX6, GD18, GY1, YQ1, YQ6, NBN) were used for field experiments during 2015–2017. HongYou-7 (HY7), a local high-yielding and disease-resistant variety was used as the control variety. DI, disease index. Different letters above the columns indicate significant differences at P < 0.05 based on Duncan’s test (n = 3)