Movement of Insecticides in Soils Under Leaching and Non- Leaching Conditions1

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Abstract:

In 1954 a Miami silt loam and a muck soil were treated with aldrin at 10 lb. and 200 lb./acre, lindane at 10 lb. and 100 lb./acre and DDT at 10 lb. and 100 lb./acre. The insecticides were sprayed on the soil as an emulsion with a sprinkling can and then rototilled into the soil to a depth of 4 to 5".

Seventeen months later 84 to 96/ of the insecticides were found in the upper 3-inch level of the loam soil, 4 to 12/ in the 8 to 6" layer, and 0 to 5/ in the 6 to 9" layer. In the muck soil 62 to 74/ was found in the top layer, 19 to 29/ in the 3 to 6" layer and 7 to 8/ in the 6 to 9" layer. No differences were noticed between individual insecticides. At the same time lindane was found to be unequally distributed in a horizontal direction. Three years after treatment, slightly (5 to 15) sloping plots contained front 1.3 to 2.2 time more insecticide in the lower half as compared with the upper half of the plot.

Experiments, conducted under laboratory conditions, showed that lindane was leached to some extent from a treated soil into an untreated one. The leaching was most notice able in Plain field sand and least noticeable in muck soil .Under non-leaching conditions, lindane also moved into the untreated layer, hut more was retained in a muck soil than in a Plain field sand. When radioactive parathion (P32) was used, it was found that during a period of 6 days, parathion moved upwards, downward. and side wards as well. The results obtained seem to indicate that the movement of parathion is more rapid in a Plain field sand than in a muck soil, as the latter retains the insecticide to a greater extent. In a Plain field sand, 6.6/ of all the parathion recovered was in the untreated layers adjacent to the treated one and 3.5/ in the untreated layers most distant from the treated one. The respective figures for a muck soil were 10.8/ and 1.8/.

Preliminary experiments conducted with aldrin under nonleaching conditions indicate movement of this insecticide to a considerable extent.

Document Type: Research Article

Publication date: June 1, 1958

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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