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ARS Home » Research » Publications at this Location » Publication #105434
Title: A SINORHIZOBIUM FREDII STRAIN ENHANCED GROWTH AND PRODUCTIVITY OF FUNGICIDE-TREATED SOYBEAN.

Author
item Van Berkum, Peter
item SALEH, SALEH - ARC, EGYPT
item HASHEM, FAWZY - UNIV. OF MD EASTER SHORE
item DADSON, ROBERT - UNIV. OF MD EASTER SHORE

Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 10/1/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The relative sensitivity of ten strains of Bradyrhizobium japonicum and Sinorhizobium fredii to four fungicides was determined. Strain USDA 110 and HH 303 were the most sensitive and resistant strains of fungicides, respectively. Survival of these two strains on soybean cv. Williams, seed treated with Benomyl or Vitavax, 3 g/kg, was examined. Both fungicides were toxic to strain USDA 110, causing complete loss of viability after a 3 h exposure. Strain HH 303 was resistant to fungicides up to 24 h exposure. Growth and symbioses of soybean plants inoculated with single strain peat inocula of ten bacterial strains were insignificantly and significantly reduced by "Benomyl and Captan" and by "Thiram and Vitavax", respectively. In the field, fungicides significantly reduced growth and seed yield of cv. "Crowford" when seeds were coated with single peat inocula of B. japonicum strains, but had no significant effect on seeds inoculated with S. fredii.