تقيم كفاءة عامل المقاومة الاحيائية Azotobacter chroococcum في مكافحة الفطرRhizoctonia solani مسبب مرض تعفن جذور الباذنجان (Solanum melongena L.) تحت ظروف الظلة الخشبية

Abstract

This study was conducted to isolate and identify the causal agent of root rot disease on eggplant in Babylon governorate, and to examine antagonistic ability of some biocontrol agents against the fungus. The results of isolation and identification showed that Rhizoctonia solani was present in these samples in a frequency of 22.5-47%., the fungus was identified up to the species level based on its cultural and morphological characteristics. A preliminary test of pathogenicity for R. solani isolates showed that the isolates were different in their effect on cabbage seed germination. The isolates RS-1 ،RS-2 ،RS-4,RS-7-1 prevented seeds germination completely, compared with control (98.66 %). Results also showed that pathogenic isolates affected in incidence on eggplant , which ranged between 46.60-86.60% compared to 0% in control treatment (without pathogen). Four isolates of Azotobacter chroococcum were isolated. A. chroococcum caused significant inhibition in growth (50.7-69.3%) of R. solani.