Action of Pyrethrum Upon the German Cockroach1

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Abstract
Factors influencing the ap-pendicular reactions of pyrethrum-treated German roaches were studied by means of kymograph recordings. The results suggest that excitation, which appears to be the result of the stimulation of successive sensory endings in the integument, and paralysis, the time of onset of which appears to depend on the speed with which the pyrethrins are spread to the thorax and their subsequent inactivation of the thoracic ganglia, depend upon the rate of diffusion of pyrethrins through integumentary secretions as influenced by the dose, concentration, and viscosity of the insecticide solution. An oily film on the ventral surface of the German roach may moisten particles of pyrethrum powder applied to that area.

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