Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 13, 1997
Publication Date: N/A
Technical Abstract: Ten strains of Fusarium sambucinum were isolated from potato tubers collected in the northeastern US. Five antagonists, produced in a semidefined liquid medium representative of commercially utilized media, decreased disease incited by all F. sambucinum strains by 34% compared to F. sambucinum alone. However, antagonists frequently were more effective when produced on 1/5 tryptic soy broth agar (TSBA/5)(43% disease decrease) Pathogen strains differed in virulence and in how effectively they were biologically controlled (22-55% disease decrease). In separate experiments to compare the efficacy of antagonists produced on nutritionally identical media in liquid and solid form, antagonists were highly effective, though those produced in TSB/5 were less efficaceous than those produced on TSBA/5 (87% vs. 92% disease decrease, respectively). Biological control of diverse strains of F. sambucinum is feasible when antagonists are produced using liquid media required for commercial production.