Journal of Economic Entomology (1995) 88, 649-653

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Rudolf H. Scheffrahn, Gregory S. Wheeler and Nan-Yao Su (1995)
Synergism of methyl bromide and sulfuryl fluoride toxicity against termites (Isoptera: Kalotermitidae, Rhinotermitidae) by admixture with carbon dioxide
Journal of Economic Entomology 88 (3), 649-653
Abstract: Toxicities of methyl bromide and sulfuryl fluoride in combination with CO2 were assessed against pseudergates of Incisitermes snyderi (Light) and workers of Coptotermes formosanus Shiraki. Estimates of lethal accumulated doses (LAD, 20-h exposure) of methyl bromide for 99% mortality against I. snyderi were 50, 37, 28, and 28 mg x h/liter and, for sulfuryl fluoride, 45, 30, 30, and 33 mg x h/liter at 0, 5, 10, and 20% CO2 (vol:vol), respectively. LAD99 values against C. formosanus with methyl bromide were 38, 32, 24, and 24 mg x h/liter and, for sulfuryl fluoride, 45, 29, 20, and 28 mg x h/liter at 0, 5, 10, and 20% CO2 (vol:vol), respectively. In general, CO2 enhanced the toxicity of methyl bromide against I. snyderi more than against C. formosanus, whereas CO2 increased the toxicity of sulfuryl, fluoride against C. formosanus more than against I. snyderi. Based on LAD99 values against I. snyderi, a maximum synergism ratio (SR) of 1.8 was induced by CO2 in admixture with methyl bromide at 10 or 20% CO2. For C. formosanus, a maximum SR of 2.2 was attained with 10% CO2 when combined with sulfuryl fluoride. These results indicate that the application rates of structural fumigants may be reduced by the simultaneous addition of 10% CO2 into fumigated airspace.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Nan-Yao Su

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Coptotermes formosanus U.S.A. (SE)
Incisitermes snyderi U.S.A. (SE)