بررسی واکنش مقاومت لاین ها و هیبریدهای دیررس و متوسط رس ذرت نسبت به بیماری پوسیدگی فوزاریومی بلال

Fusarium ear rot is one of the most important diseases in the throughout of the world. Using resistant cultivar is applied for the best way controlling. In order to evaluate late and moderately maize maturity lines and hybrids to Fusarium ear rot , an experiment was carried out with 12 lines and 17 hybrids in 2015 and 19 lines and 12 hybrids in 2016 in RCBD with three replications at Karaj and Sari stations . In this investigations all ears of plants was inoculated by nail punch technique at flowering stage. At physiological maturity, evaluation was conducted by using disease severity index (1-6).The results of combined analysis showed that there is significant difference among lines and hybrids on disease severity. The majority of hybrids were tolerant to disease. In 2015, In this experiment two resistant hybrids No.( 9) with pedigree Xto3 × K166B and No.3 with pedigree KSC 709 were identified to disease. Among 12 lines , two lines No .5 with pedigree K 18 and line No .8 with pedigree K 166 A categorized in resistant group (R) . Also in 2016 one resistant hybrid No.8 with pedigree K sc 705 was identified to disease . Among 19 lines , three lines No .5 with pedigree K 18و line No.13 with pedigree K 3544/1 and line No.12 with pedigree KLM 78012/6-1-1-1-1-2 categorized in resistant group (R).Key words: Maize, Fusarium ear rot, resistance , susceptibility.