J. Agric Sci. .Mansoura Univ., 31(12):7589-7604.(2006)
EVALUATION OF SOME PEANUT CULTIVARS FOR THE SUSCEPTIBILITY OF INFECTION BY DAMPING –OFF, ROOT AND POD ROT DISEASES AND OCCURRENCE OF AFLATOXIGENIC FUNGI
Mahmoud , E.Y1., Eetmad, E.I. Draz1 and M.F. AbolEla2
1Plant Pathology Res. Inst, Agric. Res. Center, Giza, Egypt
2Central laboratory for food and feed, Agric. Res. Center, Giza, Egypt
Under greenhouse and field conditions all peanut cvs. tested varied in their susceptibility to infection by damping - off, and peanut root rots, Ismailia l and R 92 cvs. were the most resistant against infection by damping -off, and peanut root rot diseases and gave the highest percentage of survived plants, while Giza 5, Giza 4 and Gorgia cvs. were the highly susceptible cultivars to infection by damping-off and peanut root rot. Varietal reaction showed that pod rot diseases were common on all cultivars and the nine cultivars tested differed greatly in their reaction to the diseases, also no one of these cvs. showed completely resistance to aflatoxin production and invasion with aflatoxigenic fungi. Aspergillus flavus was more invasive than Aspergillus parasiticus and often dominated in peanut seeds than shells. Giza 4, Gorgia and Giza 5 cvs. were the highest susceptible one to pod rot diseases and recorded at the same time the highest frequency of aflatoxigenic fungi and content of aflatoxin. While, R 92 and Ismailia 1 cvs. appeared high resistance in this respect.
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Keywords: Peanut, cultivars, damping - off, root rots, pod rots, aflatoxin production, aflatoxin contaminations, aflatoxigenic fungi, Aspergillus parasiticus, Aspergillus flavus, Rhizoctonia. solani, Sclerotium rolfsii, Fusarium solani, Macrophomina phaseolina and peanut yield