College of Agriculture, All India Coordinated Sorghum Improvement Project, Indore
The disease garden technique of identifying and of evaluating varietiesfor their resistance was modified. Test varieties were exposed to the pathogens of potential diseases under natural field conditions prevailing during the crop season alongwith standard indicators for comparison. The disease intensity was recorded using a standard 0–5 disease index scale. The varieties with mean disease index–1 and 2 with respect to that of 4 and 5 of the standard indicators were considered to possess high and moderate resistance against the leaf spot disease in question.
Amongst the 8 sorghum varieties and hybrids tested, CSV–4, CSV–5 and CSH-5 possessed general as well as horizontal resistance against 6 leaf spot diseases viz., rough spot, gray spot, anthracnose, zonate spot, sooty stripe and rust.
