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In-Vitro Studies On The Potential For Biological Control Of Fusarium
oxysporum F. Sp. Lentis By Trichoderma hamatum
- Said El-Hassan, Simon Gowen,(1) Bassam
Bayaa (2).
(1) School of Agriculture, Policy and
Development, Reading University, Eraley Gate, P.O. Box 236, Reading RG6 6AT,
Berkshire, UK,
E-mail: s.el-hassan@reading.ac.uk
(2)
ICARDA, P.O. Box 5466, Aleppo, Syria.
Abstract
Vascular wilt, caused by Fusarium oxysporumf.sp. lentis, is one
of the most important diseases affecting lentil (Lens culinaris Medikus)
worldwide. Biological control is a promising method for managing lentil vascular
wilt. The proliferation and the antagonistic efficacy of Trichoderma
hamatum in suppressing the saprophytic growth of F. oxysporum f.sp.
lentis was studied in dual culture plates and in the soil. In dual cultures,
T. hamatum inhibited the growth of F. oxysporum and produced
abundant conidia in potato dextrose agar plate. In the glasshouse experiment,
soil was drenched with T. hamatum (6x10 8 cfu/g soil) and its
filtrate at 40 ml filtrate/kg soil (vol/wt) around seedlings of a lentil
susceptible line (ILL 4605) artificially inoculated with F. oxysporum. Percent
mortality was reduced to 31% compared to 100% in the control treatment (p 0.05)
during 73 days from planting. T. hamatum appears to be a strong
mycoparasite and good competitor of F. oxysporum hyphae both in-vitro and
in the rhizosphere of lentil plants. .
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