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Biological Control Of Root Rot Of Wheat By The Use Of Some Isolates Of
Trichoderma longibrachiatum.
- Houda Boureghda and Louiza Sidhoumi
Département de Botanique
Instiut National Agronomique(INA), El Harrach, Alger, Algeria E-mail: houdaboureghda@yahoo.fr
Abstract
Root rot of wheat caused by a complex of fungi (Fusarium graminearum,
Fusarium culmorum, Fusarium avenaceum and Cochliobolus sativus) is one of
the most important diseases of wheat culture in Algeria, Biological control of
this disease by the use of 3 isolates of Trichoderma longibrachiatum
showed that these isolates have an antagonistic effect against Fusarium
graminearum in vitro and in vivo. In vitro and when inoculated in dual
cultures with the 3 isolates T. longibrachiatum grew faster and reduced
the growth and the conidia production of F. graminearum. The culture
filtrates of the three isolates T. longibrachiatum reduced the conidia
germination of F. graminearum. In vivo, the treatment of wheat seed by a
spore suspension of T.longibrachiatum before sowing in a soil already
infested with F. graminearum showed a net decrease of disease severity
compared with the control. Differences between the efficacy of the three T.
longibrachiatum isolates against F. graminearum in vitro and in vivo
were noticed.
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