Effect of some Fungicides and Bioagents on Controlling Seed-Borne Diseases on Faba Bean

El-Sayed Hassan, Radi Abd-El-Ghany, Emad Gendy
2013 Egyptian Journal of Phytopathology  
His study was undertaken to investigate the seed-borne fungi of faba bean that attack the plants and reduce their yield in Egypt. The results provide a database for further study to control death pathogens. The blotter test methods used surface-sterilized faba bean seeds were tested to detect and isolate death associated seed-borne fungi. The following 8 fungal species belonging to 5 genera were observed and identified as: Aspergillus niger (Van Tieghem), Alternaria alternata (Fr.) Keissler,
more » ... ariurn oxysporum (Schlechlendahl), F. semitectum (Berkeley and Ravenel), F. solani (Mart.) Sacc., F. moniliforme (verticillioides) (Sheld), Rhizoctonia solani (Kuhn.). The pathogenicity test revealed that the most commonly isolated fungi from pre-and post-emergence damping-off and stunted seedlings were R. solani, F. moniliforme, F. oxysporum F. solani. These fungi significantly reduced the photosynthetic pigments in faba bean leaves. R. solani, followed by F. moniliforme, F. oxysporum caused the greatest reduction in chlorophyll content and significantly reduced total phenols content when compared with the other tested fungi. In vitro, all tested fungicides indicated that increasing concentrations of the tested fungicides have gradually decreased the fungal linear growth of the tested pathogenic isolates. All pathogenic fungi were sensitive to Premis, followed by Topsin-M, Maxim, Rizolex-T, Vitavax 70 while, F. semitectum was sensitive to Vitavax 70, while, F. moniliforme was sensitive to Rizolex-T. On the other hand, using antagonistic bioagents significantly reduced the in vitro linear growth of all examined fungi, where B. subtilis and Plant Guard (4 m/L) were the most effective bioagents B. subtilis followed by Plant Guard. Scanning infestation of faba bean seeds with tested root-rot pathogens decreased the percentages of protein and carbohydrates content into three tested faba bean seeds of cvs. Giza-843, Misr-1 and Sakha-1 comparing with uninfested seeds (control) at all incubation days which ranged between 10-30 days. Regarding the effect of bioagents against root-rot pathogens, (Mathew and Gupta, 1998) emphasized the abilities of Trichoderma viride, Trichoderma koningii, T. harzianum, T. virens and Bacillus subtilis in inhibiting the linear growth of root-rot fungi like R. solani and F. solani on faba bean and other legume crop. Also, El-Gindy (2003) mentioned that T. harzianum, T. lignourm and Bacillus subtilis affected significantly the average diameter of B. fabae colonies than the control. EFFECT OF SOME FUNGICIDES AND BIOAGENTS .
doi:10.21608/ejp.2013.101984 fatcat:dod5gsgos5ewjncjss3zq4hwoy