Abstract
Root rot and wilt diseases caused by soil borne pathogenic fungi is the most sever disease attacks faba bean plants in New valley Governorate, Egypt. Efficacies of some plant resistance elicitors viz.: salicylic Acid (SA), ascorbic acid (AA), humic acid (HA) and Bion was evaluated as faba bean seed soaking, compared to untreated control treatment under greenhouse and field conditions. Under laboratory conditions, all the tested chemical inducers have no effect or little effect on linear growth of all tested pathogenic fungal isolates. On the other hand, all tested chemical inducers at different concentrations were decreased the root rot and wilt severity. Salicylic acid at 400 and Bion at 1000 ppm recorded the lowest root rot and wilt severity. All chemical inducers individually or in combination with R. leguminosarum significantly decreased root rot and wilt diseases under greenhouse and field conditions as well as increased total yield /feddan under field conditions. The combination between chemical inducers and R. leguminosarum more effective for controlling root rot and wilt diseases and increased seed yield/feddan than individually treatment. Application of SA and Bion + R. leguminosarum recorded the lowest percentage of root rot and wilt severity and the highest plant growth and yield parameter during both growing seasons.
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