ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Studies on biological control of postharvest rot in yams (Dioscorea spp.) using Trichoderma viride.

Okigbo, R. N.; Ikediugwu, F. E. O.;

Journal of Phytopathology Year: 2000 Vol: 148 Issue: 6 Pages: 351-355 Ref: 25 ref.

2000

บทคัดย่อ

From in vitro and in vivo screening tests for antagonism by isolates of Trichoderma against postharvest pathogens of yams (Dioscorea spp.), an isolate of Trichoderma viride was selected as the most promising candidate for the biocontrol of postharvest rot of yams. Inoculation of white yam (Dioscorea rotundata) with conidiospores of T. viride and subsequent storage of the tubers under the ambient environment conditions of a traditional yam barn, resulted in a drastic reduction in the frequency of occurrence of the normal tuber surface mycoflora over a 4-month (December-April) storage period. However, T. viride maintained a high frequency of occurrence during the same period. Furthermore, whereas up to 52.0% rot was found among groups of tubers that were artificially inoculated with the postharvest pathogens of yams, Aspergillus niger, Botryodiplodia theobromae or Penicillium oxalicum and also the group that was not inoculated with any organism (control), among groups of tubers that were inoculate

d with T. viride the rot was either totally suppressed or only a low percentage of rot occurred. The significance of the findings is discussed in relation to yam storage especially by farmers with limited resources.