INDUCING OF SYSTEMIC RESISTANCE IN CUCUMBER AGAINST PYTHIUM. APHANIDERMATUM, WHICH CAUSES DAMPING OFF AND ROOT ROT DISEASE

Abstract

This study aimed to evaluate the efficiency of biological applications (Glomas mossa, Trichoderma harzianum, Trichoderma viride and Azotobacter chrococcum) in resisting Damping off and root rot disease. The application of all biological factors has significantly increased the germination percentage of cucumber seeds and decreased the disease severity percentage compared with Pythim aphanidermatum treatment only and a significant increase in the wet weight and dry weight of shoots and root system of the plant. The bacteria A.chrococcom was the most influential in the study, reaching (76.7%, 73.67% 2.067g and 1.600g), respectively. Moreover, the same factors also achieved a significant increase of lignin concentration in leaves. Increase in the concentration of polyphenol oxidase and total protein in the plant reached (15.64 mlg. gm dry weight, 3.110 units. gm. 205.5 micrograms), respectively compared to the control treatment which applied with the fungus Pathogen.