Inheritance of resistance to red rot I. Evaluation of parental clones of Saccharum species against red rot pathogen (Colletotrichum falcatum Went).
The degree of resistance in parents has a profound effect on the frequency of resistance in offspring. The present study was undertaken to study the role of parental resistance in the development of red rot disease in their progenies. Sixty-seven parental clones/germplasm, comprising Saccharum species, viz., S. spontaneum (24), S. officinarum (4), S. barberi (4). S. sinense (7), S. robustum (4), Co-hybrids (16), interspecific hybrids (4) and clones showing horizontal resistant genotypes (4), were evaluated by plug method of inoculation using a virulent isolate of C. falcatum [Glomerella tucumanensis] (Co 1148, Jagadhari) to find out the nature of inheritance of resistance to red rot pathogen in sugarcane. The data recorded after 60 days of inoculation revealed that in S. spontaneum only 59% clones were resistant, while all the cones of S. barberi were resistant. Lowest degree of resistance was recorded in Co-hybrids (25%) and in clones of S. sinense (29%). However, the clones of S. officinarum, S. robustum, interspecific hybrids and some genotypes, earlier identified as having horizontal resistance, showed a resistance:susceptible ratio of 1:1.