A method for determining the dosage-mortality curve of malathion against the pea aphid, Acyrlthosiphom pisum (Harris) (Homoptera: Aphididae)

W. D. Pearson


The procedures of a reliable method for establishing the dosage-mortality curve for malathion and the pea aphid, <i>Acyrthosiphon pisum</i> (Harris), are described and evaluated. They include the choice of insecticide formulation, the conditions for rearing and collecting, the holding of treated aphids, and the analysis of mortality data. The LD50 of actual malathion in acetone solution to the pea aphid is 23.5 nanograms per aphid. The 95% fiducial limits about this estimate are 22.9 and 24.1 nanograms per aphid. The slope, ± S.E. (n=7) of the log-dosage:probit-mortality line is 5.5 ± 0.4.


<i>Acyrlthosiphom pisum</i>; Homoptera; Aphididae

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