Field corn response to granular pesticides: residues in grains and soils and nematode biological interactions.

A single side dressing application of aldicarb, carbofuran, miral or oxamyl at 2(I) or 4(II) kg a.i./ha in early season resulted in significant yield increases of corn. Cob yields increased by 24, 27, 28 and 31% in respect of miral II, carbofuran I, aldicarb I and miral I; and in grain yields by 43, 50, 65 and 84% in order of oxamyl II, aldicarb I, miral II and miral I. Aldicarb and miral residues in treated grains were <0.01 and <0.02 ppm, respectively, at either rates. Aldicarb degraded rapidly in experimental loam sand from 0.02–1.00 ppm during the early four weeks following treatment to <0.01 ppm by the eighth week and till harvest in the wet season.