Abstract
A single shank side-dressing of phorate, aldicarb, or disulfoton granules in furrow-irrigated asparagus controlled Brachycorynella asparagi (Mordvilko) for up to 79 d after harvest. Concentrations of disulfoton metabolites in asparagus fern after 66 d suggest that protection may last longer. Disulfoton and aldicarb were superior to phorate in efficacy. Uptake of insecticides in sprinkler-irrigated asparagus was poor as shown by low levels of disulfoton residues in the fern throughout the growing season. Applied rates of disulfoton were correlated positively with residues recovered from asparagus fern and negatively correlated with resultant aphid population levels. Residue analyses also provided evidence that rooting habit of the asparagus plant, the application technique, and irrigation methods significantly affected insecticide uptake.
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