Effects ofbiological resources and natural products onSclerotium rolfsii Sacc.incommon bean

Abstract

Several experiments were developed under laboratory, semi controlled and field conditions to assess effectiveness of biological resources and natural products on protecting common bean plants against disease caused by S. rolfsii. Antagonist effect of P.aeruginosa, B. subtilis, B.cepacia and P.fluorescens rhizobacterias was found. While the first two completely inhibited the in vitro growth of the pathogen the last two just did in an 80.72% and 40.97% respectively using the dual culture method. Lower levels of inhibition for each case were recorded by the use of the method of the wells. For evaluations under controlled conditions and field, in addition to the previously mentioned biological means, the effect of natural products Fungend and Chitosan in the protection of bean plants was evaluated. Treatments with P. fluorescens, P. aeruginosa and B. subtilis were similar to those achieved with chemical control (TMTD 80% PH). Affections by the pathogen were reduced for both the application of biological resources as well as natural product, in any case diseased plants were lower than non-treated plants and similar to chemical control.

Keywords

• organic farming
• biocontrol
• Phaseolus vulgaris L.
• natural products
• rhizobacteria
• agricultura orgánica
• productos naturales
• rhizobacterias