Mechanish of Absorption of Pyrethrum Powder by Roaches

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Abstract
When pyrethrum powder is applied to Blatta orientalis there is an induction period of 1 1/2 min. before any reaction is evinced. This period does not vary for conc. of powder. This first reaction is one of great excitement, followed by partial and then helpless paralysis. The time elapsing before the incidence of these last two reactions is influenced inversely by the conc. of pyrethrum in the dust used. A dust containing 25% pyrethrum powder appears to be more effective than one containing 50% pyrethrum or one containing less than 25%, but less effective than one containing 100%. The roach is probably most affected by the absorption of the toxic principles directly through the body integument, and very little by either penetration of the spiracles or ingestion through the mouthparts.

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