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Inhibiting septoria leaf blotch disease severity of wheat plants by using foliar spray with two antagonists and growth regulators under natural field conditions

Abstract Septoria leaf blotch (SLB) disease caused by Mycosphaerella graminicola affect wheat plants causing serious losses in produced yield. Evaluation the potentiality of certain antagonists and growth regulators to suppress the SLB disease severity was performed under natural field conditions for two successive growing seasons whereas three wheat cultivars were sprayed with Pseudomonas fluorescens and Trichoderma harzianum as well as the growth regulators Gibberellic Acetic Acid, Indole Acetic Acid. All applied treatments showed their activity for decreasing the disease severity. The lowest disease severity and highest grains yield was recorded at fungicide Amistar treatment followed by growth regulators GAA, IAA and then the antagonists, P. fluorescens and T. harzianum in descending order. Based on the present finding, it could be concluding that the use of plant growth regulators as well as antagonists as foliar spray on wheat plants revealed reduction in SLB disease severity and increase in produced yield in return