الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Distinguishable symptoms of Bakanae disease have been observed at rice fields of 6 governorates. Pathogenicity test of Fusarium isolates (131 isolates), G. fujikuroi was the most highly virulent, common, abundant and only virulent specie. Therefore, F. verticillioides, F. semitectum and F.oxysporum it considered as avirulent species. PCR-RFLP, fumonisin analysis and gibberellin production were used to identify the previous isolates group, the results showed that these isolates belonging to G. fujikuroi (group 1) and F. verticillioides (group2). Abnormal elongation was typical and specific symptoms which more distinguished to bakanae disease. Also, highly infected seedlings were more chlorotic when compared to healthy. A significant increase in rice pant enzyme activity and hormones it may be associated with the infection process. T. viride and B. subtilis were effectively in reduced the infection percentage of infected rice plants with G. fujikuroi compared with the rest treatments. Results revealed that there are significant differences among different rice cultivars in their response to bakanae disease infection under different levels of nitrogen.