Responses of Maize Early Maturity Genotypes to Fusarium Ear Rot

In order to find resistance sources to Fusarium ear rot among early maturity maize lines and hybrids, an experiment was carried out with 20 different geanotypes arranged in RCBD with two replications in Karaj and Sari Agricultural Stations during 2003 and 2004. In this investigations all ears of plants were inoculated by nail punch technique at flowering stage. At physiological maturity, evaluation was condocted using disease severity index (1-6). The results of combined analysis showed significant differences among geanotypes for disease severity. Frequency of genotypes, resistant to Fusarium ear rot was %10. Based on ranking of genotypes, K SC 500, K SC 302 and K SC 400 were moderately resistant hybrids, while KE 76009/1-2-1-2 and KE 77005/1-5-1 were the most resistant and the most susceptible lines, respectively.