Screening of colocasia genotypes for natural occurrence and reactions against leaf blight disease

Abstract

Twenty four genotype of colocasia were collected from throughout the Chhattisgarh state and screened against leaf blight disease in natural occurrence and infection at field condition for reactions during Kharif season of 2018 and 2019. Results revealed that among screened genotypes, three genotypes (IGCOL-PITH-17-1, IGCOL-PKJ-17-1 and IGCOL-CHLN-17-1) showed least terminal per cent disease infection (0.00%) in both years (during 2018 & 2019). Likewise the average terminal per cent disease infection also 0.00% and were significantly superior over rest of the genotypes. In reaction levels, three genotypes (IGCOL-PITH-17-1, IGCOL-PKJ-17-1 and IGCOL-CHLN-17-1) were found having no reactions i.e. resistant, six genotypes (IGCOL-BDL-17-1, IGCOL- PWND-17-2, IGCOL-KS-10-1, IGCOL-KS-13-2, IGCOL-CHHTD-18-1 and IGCOL-MUNG-17-1) were exhibited moderately resistant, eleven genotypes (IGCOL-BNR-17-1, IGCOL-MNDG-17-1, IGCOL-GB-17-1, IGCOL-DK-17-1, IGCOL-BL-12-1, IGCOL-JS-12-1, IGCOL-KDKN-17-1, IGCOL-PWD-17-1, IGCOL-CHMD-18-1, IGCOL-LHDD-18-1 and White Gauriya (S.C.)) were recorded moderately susceptible and two genotypes viz., IGCOL-KOTA-17-1 and IGCOL-SPL-17-1 were observed to be susceptible while, two genotypes (IGCOL-NGR-17-1 and IGCOL-PWND-17-1) were found highly susceptible against Phytophthora leaf blight disease of colocasia under in-vivo condition.