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

Hassan, El-Sayed; Abd-El-Ghany, Radi; Gendy, Emad

doi:10.21608/ejp.2013.101984

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

Document Type : Original Article

Authors

¹ Seed Tech. Res. Dept., Field Crop Res. Inst., ARC, Giza, Egypt

² Plant Pathol. Res. Inst., ARC Giza, Egypt

³ Dept. of Leguminous Res., Field Crop Res. Inst., ARC, Giza, Egypt

10.21608/ejp.2013.101984

Abstract

This 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, Fusariurn 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.

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