Abstract
Systemic implantation cartridges containing liquid formulations of acephate or methamidophos provided 98% and 90% population reduction of western spruce budworm larvae on grand fir. Acephate residue levels in midcrown foliage reached laboratory determined LC 90 values for western spruce budworm larvae within 5 days after treatment. Medicap cartridges containing powdered formulations of carbofuran or dimethoate and Mauget injector units containing a liquid formulation of oxydemeton-methyl provided inadequate population reduction: whereas, Medicaps containing a powdered formulation of acephate provided 93% population reduction. Acephate residue levels in midcrown foliage were sufficient to cause mortality of western spruce budworm larvae by 20 days after treatment.
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