Availability of Dieldrin to Adult Blissus leucopterus and Larval Cyclocephala immaculata in treated Sand, Loam, and Muck Soils1

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Abstract
Based on LC50 values, each test insect required much higher concentrations of dieldrin on muck or loam soils than on sand in order to obtain comparable mortalities. Apparently, only a small fraction of the dieldrin in the loam or muck soils was available to either of the test species. In addition, there were no significant differences in the relative susceptibilities of the two test species between each soil type. The data indicate that ingestion of the muck soil by Cyclocephala larvae did not greatly increase the biological availability of the large amounts of sorbed dieldrin. Evidently, the binding of dieldrin to various soil fractions (including the organic fraction) is due primarily to a strong physical adsorption effect. Comparison of results with those of other workers suggests that dieldrin may be more tightly bound to a soil than is either aldrin or lindane. There was also evidence that the bonding of dieldrin to a given soil occurred quite rapidly. Based on direct contact tests with treated loam soil, there was apparently a hyperbolic relationship for the influence of soil moisture on the effectiveness of dieldrin treatments against chinch bugs, Blissus leucopterus (Say).

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