Abstract
In order to study the resistance of early maize genotypes to Southern Corn Leaf Blight (SCLB) or Maydis Leaf Blight (MLB), RCBD experiments with 20 inbred lines and hybrids in 2014 and 16 genotypes in 2015 were conducted at Karaj and Sari Stations. Inoculation was carried out with spore suspension using syringe (3ml/each whorl) firstly at 3-4 leaf stage of maize, and then, sorghum grain inoculated with fungus was applied at 6-8 leaf stage in whorl of each plant using the bazooka technique. Evaluation was done on the basis of disease progress at pollination stage and two weeks after pollination stage with scale 0-5. The results of variance analysis and mean comparison showed that there are different reactions among genotypes to disease. In this study, in 2014, 15% genotypes categorized into resistant group, and these were genotypes: KE 77003/10 ? KE 75039, KE 72012/12 ? K1263/1 (KSC 400), and K 2331 ? KE 75039. Among 16 genotypes in 2015, three hybrids - No. 16 with pedigree (KE 76009/311? K 1264/5-1), No. 10 with pedigree (K 2331 ? KE 75039) and No. 9 with pedigree KSC 400 (KE 72012/12 ? K1263/1) - were identified as resistant hybrids that can be a good source of resistance to SCLB.
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