Journal of Applied Entomology (2004) 128, 332-336

M.M. Hasan and C. Reichmuth (2004)
Relative toxicity of phosphine against the bean bruchid Acanthoscelides obtectus (Say) (Col., Bruchidae)
Journal of Applied Entomology 128 (5), 332-336
Abstract: The toxicity of phosphine against adult Acanthoscelides obtectus (Say) was studied over a range of concentrations, viz. 0.01, 0.0125, 0.015, 0.02, 0.04, 0.08, 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0 mg/l and exposure periods, viz. 0.25, 0.50, 1, 2, 6, 12, 24 and 48 h at 25°C and 65% relative humidity. Results show that both the parameters exhibited significant effects on the mortality of A. obtectus. Data indicate that 100% mortality only occurred in A. obtectus when 1-, 2- and 12-h exposure times were involved in the respective highest individual ct product. The ct products decreased as the exposure times increased for both the mortality levels of 50 and 99%. The minimum ct products for 50 and 99% kill were 0.19 and 0.29 mg h/l, respectively, at an exposure of 12 h. The influence of thresholds on regression equations of the form cⁿt = k were 0.59 and 13.80 (mg/l)ⁿh for the fixed concentration for 50 and 99% mortality levels, respectively while they were 0.45 and 12.45 (mg/l)ⁿh for the six exposure periods for the same mortality levels.
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Link to article at publishers website
Database assignments for author(s): Md. Mahbub Hasan

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

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Pest and/or beneficial records:

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