Soil Distribution of Fenamiphos Applied by Overhead Sprinkler Irrigation to ControlMeloidogyne incognitaon Vegetables

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Abstract
Fenamiphos applied to squash [Cucurbita pepo] and cucumber [Cucumis sativus] to control M. incognita at 4.5, 6.7, 9.0 and 18.0 kg a.i.[active ingredient]/ha via injection into a sprinkler irrigation system was compared with fenamiphos granules spread on the soil surface at 9.0 kg a.i./ha and incorporated into the top 15 cm of soil. Nematode populations in the soil and root gall indexes were lower and yields were greater in treated than in untreated plots. Root gall indexes did not differ between methods of application of fenamiphos at 9 kg a.i./ha on most sampling dates; however, root gall indexes of cucumber in broadcast and incorporation plots were lower than those in irrigation plots after the final harvest. Based on root gall indexes, fenamiphos concentrations above 1.5 .mu.g/g of soil in the 0-15 cm soil layer for 10 days appear to be adequate for controlling root-knot nematodes on squash and cucumber. Concentrations of fenamiphos in the 0-15 cm soil layer were below 1 .mu.g/g of soil 30 days after application at all rates.