Toxicity Of Methyl Bromide Research Articles

The influence of oxygen on the toxicity of fumigants to Sitophilus granarius (L)

Abstract The toxicity of six fumigants—methyl bromide, ethylene dibromide, ethylene oxide, hydrogen cyanide, hydrogen phosphide and carbon tetrachloride to S. granarius was determined in atmospheres containing 0, 1, 3, 20·9 and 100 per cent oxygen. Toxicity was generally increased with decreasing oxygen concentration until the latter was reduced to 1 per cent. In an atmosphere of nitrogen, where no oxygen was present, toxicity was reduced by varying degrees depending on the fumigant; with hydrogen phosphide the insects could not be killed by any concentration of fumigant applied to them in the absence of oxygen. Carbon tetrachloride was most toxic in 20·9 per cent oxygen and below this concentration toxicity was reduced as oxygen was depleted. Tribolium confusum Du V. was found to differ from S. granarius because, in the absence of oxygen, the toxicity of methyl bromide was not reduced.

Toxicity of methyl bromide to Acarus siro, a cheese-infesting mite.

Laboratory fumigations were conducted to determine the toxicity of methyl bromide (CH3Br) to the mite Acarus siro L. when exposed for 4, 8, 16, or 24 hours. All stages of the mite were fumigated in 12-liter round-bottomed flasks at 60±2°F and 85±15% RH, using a new type of exposure cage and fumigation chamber. The dosage (mg per liter) required for the LC95 varied from 16.77 for 4-hour exposure, to 8.08 for 8-hour. to 5.22 for 16-hour. to 3.36 for 24-hour exposure.

Inhibition of SH Enzymes by Methyl Bromide

THE high toxicity of methyl bromide to man, and X the insidious character of its action, particularly at low concentrations, were not realized when this compound was first introduced as a fumigant and as a fire-extinguishing agent, but are now well established and have been emphasized in a pamphlet recently issued by the Home Office1. Yet its mode of action has remained obscure. It has been frequently suggested that this action results from an accumulation of the products of hydrolysis2,3, but the experimental evidence does not support this view4, unless the hydrolysis takes place intracellu-larly5; a theory which would not explain the close parallelism between the symptoms of poisoning by methyl bromide and methyl chloride6,7.

Toxicity of Methyl Bromide to the Common Red Spider and to Greenhouse Roses

Journal Article Toxicity of Methyl Bromide to the Common Red Spider and to Greenhouse Roses Get access Clyde C. Hamilton Clyde C. Hamilton Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Economic Entomology, Volume 34, Issue 2, 1 April 1941, Pages 232–237, https://doi.org/10.1093/jee/34.2.232 Published: 01 April 1941