EFFECT OF SOME MICROELEMENTS AND BIOLOGICAL CONTROL AGENTS IN CONTROL OF TOMATO SEEDLING DAMPING-OFF CAUSED BY RHIZOCTONIA SOLANI KUHN

This study was conducted at plant protection Department/College of Agriculture/ University . of Basrah to evaluate the efficiency of some Biological and chemical factors and there interaction in control Tomato damping-off disease caused by Rhizoctonia solani. The results showed that biological control agent (Trichoderma harzianum ; Bacillus subtilis) have a high antagonistic ability in inhibition the growth of R.solani. It was also found that Flutolanil fungicide, copper and silicon elements were completely inhibited the growth of the pathogenic fungus at 30, 200, 500 ppm respectively. Pot experiment in Glass hose showed that T.harzianum + B.subtilis + Flutolanil (T + B + F) reavealed higest percentage of seed germenation reached to 100% compared with 60% for pathogen treatment. On the other hand T + B + F treatment reduced the percentage of damping-off rateto zero % compared with 45.395% of pathogen fungus R.solani. The result also showed that the use of biological agent as seed coating and chemical agent led to increased the concentration of NPK in tomato plant.