Evaluation and response of selected maize genotypes to Stenocarpella maydis in Maseno farm, Maseno (Kenya)

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Evaluation and response of selected maize genotypes to Stenocarpella maydis in Maseno farm, Maseno (Kenya)

George T. Opande, Mathews Dida, Phillip Onyango, Christine Wesonga
Int. J. Biosci.11( 2), 170-175, August 2017.
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Maize ear rot disease is caused by Stenocarpella maydis and other ear rot fungus that work in a complex relationship. The disease lowers the quality of the maize cob and grains. Before this study, there was no documented report on the susceptibility of the 9 selected genotypes namely; EH10, EH14, EH15, P3253, H614D, EH13, H516, H515 and EHI6 to S. maydis, therefore information gained on the response of these genotypes to S. maydis would be helpful not only in determining resistance of the 9 genotypes but also provide useful information in the continuous evaluation of germplasm for ear rot resistance. Investigations were conducted on the genotypes that were planted between September – December 2014 and February – July 2015 in the Maseno University farm and analysis conducted at the botany laboratory located within geographical coordinates; 0 1’0’’ S, 34 36’0’N at an altitude of 1503 meters above sea level. The experimental design was Alpha lattice, replicated thrice with nine hybrids. The mean severity scores level for the 9 hybrids was 1.98. EH10, EH14, EH15, and P3253 hybrids were resistant to S maydis H614D, EH13, H516, H515, EHI6 hybrids susceptible to the S. maydis ear rot fungus. S. maydis was also found to be the main ear rot causing fungus in Maseno University farm constituting (8-9%) while Nigrospora caused highest severity score of 3.


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