Abstract
The ability of Rhizoleen-T and Rhizoleen-B to suppress the roots’ diseases of cucumber caused by Fusarium oxysporum and Rhizoctonia solani and induction of the plant defence system was evaluated. The results showed a significant suppression in damping-off and root rot of cucumber when the two biofungicides were applied. They increased the surviving percentage of the treated plants to 98.0% and reduced the mean disease rating to 1.0. The biofungicides significantly enhanced the plant’s morphology and physiology when compared with either infected or non-infected control. The mechanism of action of the biofungicides is could be through the enhancement of the plant defences, in addition to their antifungal effect. They stimulated the defence of the plants by increasing the content of proline and phenols and induction the defensin genes. Biofungicides induced defence genes in the 50-day-old treated plants. The biofungicides are effective, cost effective and applicable in the control of root diseases of cucumber.
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