A Boll Weevil Repellent from the Volatile Substance of Cotton2

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Abstract
During the process of purifying a crude boll weevil attractant extract in chloroform obtained from cotton, the residue remaining after chloroform evaporation at room temperature was biologically assayed and found to be repellent to the boll weevil, Anthonomus grandis. Treated cotton seedlings were protected for 5-12 hours and treated squares and bolls in the presence of untreated controls for 36 hours. Weevils exposed to treated bolls and squares, without other food available, were effectively repelled for 8 hours. Repellency appeared to be associated with the highly pungent odor of the oily residue.

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