CARROT YIELD INCREASES AFTER CHEMICAL CONTROL OF ROOT-KNOT NEMATODE IN ORGANIC SOIL

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Abstract
In root-knot nematode-infested soil, post-treatment effects of nematicides on duration of acceptable yields of marketable carrots (Daucus carota L.) and on nematode population dynamics were determined. These studies included a comparison of the efficacy of granular nematicides and soil fumigants. Surviving nematodes multiplied and caused unacceptable losses 2 yr after fumigation. Fumigation with Telone, D.D. or Vorlex gave the best nematode control and the highest marketable yield. Oxamyl, aldicarb and fosthietan gave a significant protection of carrots at doses of 3 and 6 kg a.i./ha. Bunema, phenamiphos and carbofuran were the least effective.