The effect of gas velocity on the fumigant action of nicotine, dichlorvos and hydrogen cyanide

Abstract

The toxicities of nicotine and dichlorvos acting as fumigants were found to be enhanced as the gas velocity was increased, while the toxicity of hydrogen cyanide was barely affected. Beyond a certain point increased velocity had no further effect on toxicity and a steady state was reached. There was no significant difference in the time taken to paralyse a number of insect species at high and low velocities. Increased kills were not obtained with nicotine applied during pressure fluctuations.