Inhibition of Rotylenchulus reniformis Penetration of Tomato and Cotton Roots with Foliar Applications of Oxamyl

Foliar applications of oxamyl (methyl N', N'-dimethyl-N-[(methylcarbamoyl)oxy]-l-thiooxamimidate) were applied 24 hr before transplanting seedlings to soil infested with Rotylenchulus reniformis. With a single application of oxamyl, tomato seedlings required 600 ppm to significantly inhibit R. reniformis penetration. Cotton seedlings, however, required a single application of 2400 ppm for significant inhibition of penetration, but only 600 ppm when two or more applications were used.