EVALUATION OF SOME BIO-PESTICIDES FOR THE CONTROL OF YAM TUBER ROT

  • Q.U. Ano National Root Crops Research Institute, Umudike, P.M.B 7006, Umuahia, Abia State, Nigeria
Keywords: Plant extracts, Rot, Fungi, and Yams

Abstract

pathogens in Ebonyi State in 2017 cropping season. The laboratory study involved isolation and identification of
fungi associated with rots in yam tubers. The test fungi isolates include: Penicillium spp, Aspergillius spp,
Botryodiplodia thebromae, Rhizopus stolonifer, and Trichoderma spp were used for pathogenicity test on healthy
yam tubers. The effects of plant extracts of garlic, ginger and moringa were used for the inhibition of growth of
fungi isolates using pour plate technique. Data collected were subjected to one-way analysis of variance using the
SPSS statistical package and mean separation carried out using DMRT at p<0.05. The main rot causal
microorganism identified in stored yams was Botryodiplodia theobromae, which also had the least inhibition at
43.0% due to its virulence. Garlic extract showed the highest anti-microbial effect against all the test fungi,
especially on Trichoderma spp. at 89.8% and Panicillium spp. at 83.9%, followed by ginger extract on
Penicillium spp. at 68.7% and Aspergillius spp at 54.1%, moringa extract on Penicillium spp at 71.0% and
Aspergillius spp at 55.9%. All the extracts at 100% concentration inhibited the five fungi isolates with Penicilium
spp at 78.4%, Aspergillius spp. at 69.6%, Botryodiplodia theobromae at 37.5%, Rhizopus stolonifer at 40.5% and
Trichoderma spp at 62.5%, which was significantly different from the results at 90% concentration. Thus, water
based extraction technique was an effective method in inducing anti-fungal properties of garlic, ginger and
moringa extracts. This research findings concludes that garlic, ginger and moringa extracts at 100%
concentration possess anti-fungal properties to control fungal pathogens responsible for yam rots in Ebonyi
State.

Published
2020-04-30

Journal Identifiers


eISSN: 0300-368X