|Bowers, John - USDA,ARS,USNA,FNPRU|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: August 13, 2000
Publication Date: N/A
Technical Abstract: Plant extracts in combination with biocontrol organisms were evaluated in greenhouse tests for control of Fusarium wilt. Formulated extracts (10% aqueous emulsions of cassia tree extract or chili pepper extract mixed with essential oil of mustard) or biocontrol fungi (SoilGard, RootShield, Trichoderma sp. 5c, or nonpathogenic Fusarium oxysporum CS-20) were incorporated into infested soil. After 7 days, biocontrol fungi were incorporated into extract-treated soil, and all treatments planted 3 days later. There were no significant effects (P=0.05) of biocontrol fungi alone on disease incidence. Cassia extract alone significantly reduced disease incidence. There was no further control with the addition of the biocontrol organisms. Disease control with the pepper/mustard mixture was significantly less than with the cassia treatment, but the addition of F. oxysporum CS-20 statistically further reduced disease incidence. This demonstrates the principle that a combination of a natural plant extract with a biocontrol organism may be a viable strategy to control soilborne pathogens.