The study was conducted to evaluate in vitro and in vivo control of fungal antagonists on
Rigidoporus lignosus (klotzsch) Imaz in Hevea brasiliensis (Willd. ex A. Juss.) Muell. Arg. in
the rain forest zone of Nigeria. In vitro assessments of biological agents were carried out
in dixenic cultures in Petri plates. In vivo tests were carried out in the nursery using Hypocrea
virens and Hypocrea jecorina. Significant differences were observed with the dual inoculations
of fungal antagonists and R. lignosus inoculated the same day, and the antagonists
inoculated 24 h before inoculation of R. lignosus. Hypocrea jecorina was most effective in the
control of R. lignosus with percentage inhibition of 86.83 %. Hypocrea virens, H. jecorina, Trichoderma
spirale, Trichoderma sp., Trichoderma sp. Pers, and Hypocrea lixii were effective on R.
lignosus. Fungal antagonists inoculated 24 h before inoculation of R. lignosus exhibited
higher inhibitory efficacies than antagonists and R. lignosus inoculated the same day. In
the in vivo evaluation of fungi antagonists on R. lignosus, seedlings in H. jecorina treatment
at 60 d and H. virens treatment at 150 d after inoculations respectively had the highest plant
heaths (highest length of stem and length of tap rot, lowest plant death, and least foliar
symptom) compared to the control. Mortality rate was higher at 60 d after inoculation
and decline from the third months onward. Significant differences were observed between
the control and R. lignosus treatment in all the parameters evaluated.
The study was conducted to evaluate in vitro and in vivo control of fungal antagonists onRigidoporus lignosus (klotzsch) Imaz in Hevea brasiliensis (Willd. ex A. Juss.) Muell. Arg. inthe rain forest zone of Nigeria. In vitro assessments of biological agents were carried outin dixenic cultures in Petri plates. In vivo tests were carried out in the nursery using Hypocreavirens and Hypocrea jecorina. Significant differences were observed with the dual inoculationsof fungal antagonists and R. lignosus inoculated the same day, and the antagonistsinoculated 24 h before inoculation of R. lignosus. Hypocrea jecorina was most effective in thecontrol of R. lignosus with percentage inhibition of 86.83 %. Hypocrea virens, H. jecorina, Trichodermaspirale, Trichoderma sp., Trichoderma sp. Pers, and Hypocrea lixii were effective on R.lignosus. Fungal antagonists inoculated 24 h before inoculation of R. lignosus exhibitedhigher inhibitory efficacies than antagonists and R. lignosus inoculated the same day. Inthe in vivo evaluation of fungi antagonists on R. lignosus, seedlings in H. jecorina treatmentat 60 d and H. virens treatment at 150 d after inoculations respectively had the highest plantheaths (highest length of stem and length of tap rot, lowest plant death, and least foliarsymptom) compared to the control. Mortality rate was higher at 60 d after inoculationand decline from the third months onward. Significant differences were observed betweenthe control and R. lignosus treatment in all the parameters evaluated.
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