Seventeen isolates of the free-living soil fungus Trichoderma spp., collected from Meloidogynespp.
infested vegetable fields and infected roots in Benin, were screened for their rhizosphere competence
and antagonistic potential against root-knot nematodes, Meloidogyne incognita, in greenhouse pot
experiments on tomato. The five isolates expressing greatest reproductive ability and nematode
suppression in pots were further assessed in a typical double-cropping system of tomato and carrot in
thefield in Benin. All seventeen isolates were re-isolated from both soil and roots at eight weeks after
application, with no apparent crop growth penalty. In pots, a number of isolates provided significant
nematode control compared with untreated controls. Field assessment demonstrated significant inhibition of nematode reproduction, suppression of root galling and an increase of tomato yield compared
with the non-fungal control treatments.Trichoderma asperellumT-16 suppressed second stage juvenile
(J2) densities in roots by up to 80%; Trichoderma brevicompactumT-3 suppressed egg production by as
much as 86%. Tomato yields were improved by over 30% following the application of these biocontrol
agents, especiallyT. asperellumT-16. Although no significant effects were observed on carrot galling and
yield, soil J2densities were suppressed in treated plots, by as much as 94% (T. asperellumT-12), compared
with the non-fungal controls. This study provides thefirst information on the potential of West-African
Trichodermaspp. isolates for use against root-knot nematodes in vegetable production systems. The
results are highly encouraging, demonstrating their strong potential as an alternative and complementary crop protection component
Seventeen isolates of the free-living soil fungus Trichoderma spp., collected from Meloidogynespp.
infested vegetable fields and infected roots in Benin, were screened for their rhizosphere competence
and antagonistic potential against root-knot nematodes, Meloidogyne incognita, in greenhouse pot
experiments on tomato. The five isolates expressing greatest reproductive ability and nematode
suppression in pots were further assessed in a typical double-cropping system of tomato and carrot in
thefield in Benin. All seventeen isolates were re-isolated from both soil and roots at eight weeks after
application, with no apparent crop growth penalty. In pots, a number of isolates provided significant
nematode control compared with untreated controls. Field assessment demonstrated significant inhibition of nematode reproduction, suppression of root galling and an increase of tomato yield compared
with the non-fungal control treatments.Trichoderma asperellumT-16 suppressed second stage juvenile
(J2) densities in roots by up to 80%; Trichoderma brevicompactumT-3 suppressed egg production by as
much as 86%. Tomato yields were improved by over 30% following the application of these biocontrol
agents, especiallyT. asperellumT-16. Although no significant effects were observed on carrot galling and
yield, soil J2densities were suppressed in treated plots, by as much as 94% (T. asperellumT-12), compared
with the non-fungal controls. This study provides thefirst information on the potential of West-African
Trichodermaspp. isolates for use against root-knot nematodes in vegetable production systems. The
results are highly encouraging, demonstrating their strong potential as an alternative and complementary crop protection component
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