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Laboratory evaluation of insecticides for control of acyrthosiphon pisum hemiptera homoptera aphididae in alfalfa



Laboratory evaluation of insecticides for control of acyrthosiphon pisum hemiptera homoptera aphididae in alfalfa



Canadian Entomologist 110(2): 213-216



Of 11 insecticides [methidathion, carbofuran, malathion, azinphos-methyl, PP505 (3,5,5-trimethyl 2-methylcarbamoylimino-thinzolidin-4-one), formothion, oxydemeton-methyl, demeton, methamidophos, Salathion, pirimicarb] tested, 9 were as effective as dimethoate for control of the pea aphid A. pisum (Harris) in alfalfa. None, including the systemic insecticides, provided adequate protection in growing alfalfa at 7 days after treatment. The environmental impact of these materials could be reduced if the lowest effective rates were used for control because repeat applications may be required. Because pirimicarb at 0.28 kg AI[active ingredient]/ha had a reduced effect on Chrysopa oculata (Say), a predator of the pea aphid, it would be preferred to dimethoate for control of this aphid.

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