Bioresidual efficacy and phytotoxicity of certain systemic nematicides against root-knot nematode infesting tomato plants

ABSTRACT

The bioresidual efficacy and phytotoxic effects of four systemic nematicides akldicarb, carbofluran, oxamyl and fenamiphos against root-knot nematodes infesting tomao plants were evaluated in laboratory and greenhouses. The obtained results indicated the important role of nematicide type on the studied nematodes and tomato plants. Fenamiphos proved more effectiveness than the other nematicides tested against the root-knot nematode larvae, followed by akldicarb. The highest inhibition of gall formation was obtained by fenamiphos, while oxamyl was the lowest inhibitor. General, for all tested nematicides at the evaluated concentrations, the best inhibition was achieved when the nematicide was applied at the time of inoculation. The nematicides tested except fenamiphos showed clear phytotoxic symptoms on treated tomato plants characterized by significantly reduction in the dry weight of plant roots and shoots. Among the tested nematicides only carbofuran decreased significantly the height of treated tomato plants