Evaluation of 62 cowpea lines for resistance to false rust (Synchytrium dolichi (Cooke) Gaum) and scab (Sphaceloma sp.)

Abstract

We evaluated 62 cowpea lines for field resistance to false rust (Synchytrium dolichi) and scab (Sphaceloma sp.). To increase disease pressure susceptible entries were grown two weeks prior to planting the test entries. The entries were grouped as resistant, moderate-resistant, moderately susceptible or susceptible on the basis of standardised Z-scores of areas under disease progress curves. In the case of scab, three entries, namely, TVU4630, Ebelar (local) and Icirikuwai (local) were rated resistant, Likewise, IT88D-643-1, ГT90K-56 and IT90K-1026 were rated resistant to false rust but the majority of the local land races were susceptible to false rust.