The sorghum hybrid Shenza 5,highly-sensitive to Sphacelotheca reiliana,was studied for the inoculation efficiency,yield,income,and edible smut traits in different inoculation concentrations on different sowing dates.The results indicated that the inoculation efficiency and smut yield decreased with the delay of sowing date,increased with the increase of inoculation concentrations.When the inoculation concentration was 0.6% or higher,the sorghum was highly infected,reaching a high inoculation efficiency and ...