Abstract
Toxicity of methyl bromide gas to Sitophilus granarius (L.) adults in ‘Soft Red Winter’ wheat (SW) and ‘Hard Red Winter’ wheat (HW) was tested at three different temperatures (26, 15, and 5°C). Temperature and toxicity of methyl bromide were negatively correlated. LD50’s at 26, 15, and 5°C for SW and HW increased by 20 and 14% as the temperature decreased from 26 to 15°C and 29 and 44% from 15 to 5°C, respectively. The efficacy of the fumigant on S. granarius was influenced by the type of wheat. Methyl bromide was more effective in HW than in SW when both were tested under the same conditions. The SW sorbed more methyl bromide than HW irrespective of the temperature and the presence or absence of insects. Methyl bromide sorption decreased as the temperature decreased from 26 to 15°C and the difference in sorption between the SW and HW increased as the temperature decreased from 26 to 5°C.
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