Evaluation of sprayed & granular aphicides against the European asparagus aphid, <i>Brachycolus asparagi</i> (Homoptera: Aphididae) in British Columbia
A single spray of disulfoton and three of methamidophos (all at 1.12 kg ai/ha) suppressed populations of <i>Brachycolus asparagi</i> Mordvilko on immature asparagus for 90 days with light aphid damage. One application of oxydemeton-methyl (at 0.56 kg ai/ha) kept populations low as compared with the controls, but not low enough to prevent severe foliage damage. Two sprays of endosulfan (at 1.12 kg ai/ha) and three of malathion (at 2.24 kg ai/ha) during 90 days did not prevent moderate to heavy damage. The results indicated that the spray threshold of 0.5 <i>B. asparagi</i>/g of asparagus sprig used in this study was too high. No sprays controlled the other aphids present, which were mostly <i>Myzus persicae</i> (Sulzer). Granular formulations of disulfoton (at 0.5, 1.0, 2.0 and 4.0 kg ai/ha), carbofuran (at 2.0 kg ai/ha), and aldicarb (at 2.0 and 4.0 kg ai/ha) applied as side dressings alongside young asparagus, all gave excellent control for almost four months. CGA 73102 (at 1.0 and 2.0 kg ai/ha) and carbofuran (at 1.0 kg ai/ha) gave significant control for three months. Spray and granular treatments giving the best control also produced the thickest spears the following year.
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