Effects of Different Nematicides on Yield and Quality of Centennial Sweetpotato and Root-Knot Nematode Damage1

Abstract

Effects of different nematicides on yields of sweetpotatoes and on root-knot nematode (Meloidogyne incognita) damage at two different locations were studied over a period of 3 years. Average yields of marketable size roots were significantly increased on Hartsells fine sandy loam from use of Penphene, D-D, Dowfume W-85, Telone, and Nellite; the increased yield from Furadan was nearly significant. All nematicides reduced the root-knot infection counts on steam-peeled roots and root-knot larvae per pint of soil at harvest. Furadan gave the best nematode control. Average' yields were increased on Alaga sand from use of Penphen, D-D, D-D + SD14647, Vorlex, Furadan, Temik, and Mocap. Average root-knot infection counts and root-knot larvae per pint of soil at harvest were significantly reduced by all nematicides used; the greatest reductions followed applications of Temik, Mocap, Furadan, and D-D + SD14647.