Differential Sorption of Fumigant Formulations by Wheat and Relative Toxicity to Adult Rice Weevil, Sitophilus sasakii1

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Differential sorption of three fumigant formulations by wheat was determined with the Beckman GC-2 gas chromatograph. Adult rice weevil, Sitophilus sasakii (Tak.), mortality was observed. Gas and weevil samples were taken at five different wheat. depths in 6-foot towers at 1, 8, 24, 48, 96 and 168 hours following fumigant introduction.

Ratios of CCI4 to total formulation components were analyzed by an analysis of variance. Changes in CCl4, properties were studied by orthogonal polynomials.

Variation of eel, proportions in fumigant II (82.39 CCl4 17.16 CS2 and O.43 n-pentane, per cent by volume) and fumigant III (79.90 CCI4 18.06 CS2, 0.86 petroleum ether and 1.20 SO2, per cent by volume) was a significant tin1c-qua.dratic regression changing quadratically with wheat depths. Proportions of CCl4, in fumigant I (80.11 CCI4, and 19.89 CS2, per cent by volume) changed linearly with wheat depths and quadratically with sample times.

Greatest CCI4, proportions were usually observed in all three formulations near the bottom of wheat columns early in the exposure period. Formulations were approaching equilibrium at 168 hours following introduction. The three fumigants appeared equally toxic to adult weevils.

Document Type: Research Article

Publication date: April 1, 1961

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