Submitted to: Proceedings of American Chemical Society National Meeting
Publication Type: Abstract Only
Publication Acceptance Date: April 2, 1998
Publication Date: N/A
Technical Abstract: Enterobacter cloacae S11:T:07 (NRRL B-21050) is among the best microbial strains isolated from potato field soil for suppression of Fusarium dry rot of potato tubers. The strain produces several antifungal compounds in liquid culture which have shown in vitro inhibition of Gibberella pulicaris, a major causal agent of dry rot. In ongoing assays to test compounds' effectiveness against G. pulicaris at the site of fungal infection, 5 ul of mixtures containing fungal spores ( 5 x 10**5/ml) and various concentrations of test compound were used to inoculate potato wounds created with a blunt nail (1.5 x 3 mm). Disease was quantified after incubating tubers at 15 deg C for 3 weeks. Both phenylacetic acid and indole-3-acetic acid, applied at a rate of 5 mg/ml (25 ug/wound), reduced dry rot lesions to levels similar to wound-only controls.