Biocontrol potential of native Trichoderma isolates against root-knot nematodes in West African vegetable production systems

► West African Trichoderma spp. isolates significantly suppressed root-knot nematodes. ► Trichoderma spp. isolates persisted in soil for at least eight weeks after application. ► Tomato yield was improved by 30% following Trichoderma application in field. ► Soil nematode densities were suppressed by up to 94% in follow-on carrot crops. ► The most effective Trichoderma spp. isolates were sourced from nematode egg masses.