Residues on Plants Treated with DDT Granules and Emulsions for European Corn Borer Control1

Abstract

Study of the distribution of DDT residues in corn plants show that emulsion sprays result in maximum residues in plant leaves with residue deposited in the plant whorl or stalk, conversely granule formulations deposit heavy residues in the plant whorl and leaf axil and leave a negligible residue on the leaves. The residues from granule formulations on corn leaves at ear harvest were only about one-tenth that left by emulsion sprays. Attapulgite, used as a carrier for granular DDT, resulted in higher residues in the plant whorls than 5 other common carriers studied. The fluted-feed type granule distributor left greater residue deposits in the plant whorl than the chain type or fluted-shaft distributor.