. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. BULLETIN OF THE No. 167. Contribution from the Bureau of Entomology, L. O. Howard, Chief. February 10, 1915. (PROFESSIONAL PAPER.) . PARA-DICHLOROBENZENE AS AN INSECT FUMIGANT. By A. B. Duckett, Scientific Assistant, Truck Crop and Stored Product Insect Investigations. INTRODUCTION. The purpose of the following pages is to determine the insecticidal value of para-dichlorobenzene as a fumigant, as well as to ascertain the injury, if any, to cloth fabrics and the effects of the vapors on plant life as we
. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. BULLETIN OF THE No. 167. Contribution from the Bureau of Entomology, L. O. Howard, Chief. February 10, 1915. (PROFESSIONAL PAPER.) . PARA-DICHLOROBENZENE AS AN INSECT FUMIGANT. By A. B. Duckett, Scientific Assistant, Truck Crop and Stored Product Insect Investigations. INTRODUCTION. The purpose of the following pages is to determine the insecticidal value of para-dichlorobenzene as a fumigant, as well as to ascertain the injury, if any, to cloth fabrics and the effects of the vapors on plant life as well as upon the germination of seeds. Para-dichlorobenzene is a definite chemical compound, known for many years, but only recently used as an insecticide. It is a color- less, crystalline substance which volatilizes very readily as a colorless vapor with a peculiar ether-like odor. The vapor is harmless to human beings and domestic animals under ordinary conditions, but in many instances it is a specific poison for insects. It has an addi- tional advantage over the many other fumigants in that the odor does not cling to fabrics, etc., the characteristic ether-like smell rapidly disappearing upon exposure of the fumigated substances to the open air. Probably the greatest advantages that para- dichlorobenzene possesses over other fumigants are its absolute noninflammability and its comparatively low cost of purchase and application in proportion to the result obtained. EFFECTS OF INHALATION OF THE VAPOR. As stated, para-dichlorobenzene possesses only a weak ether-like smell, which, owing to the volatile nature of the substance, will pass off in a few hours if exposed to the air. Dr. Curschman, at the Greppin Works in Germany, concludes from a series of experiments that para-dichlorobenzene, when used as an exterminator for moths, etc., is virtually harmless to human beings, perhaps even superior to naphthalene in this respect. He goes further by stating that poisoning by para-dic
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