Evaluation of Insecticides for the Control OfMyzus Persicae(Sulzer) on Year-Round Chrysanthemums

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Abstract
Summary Nineteen insecticides, mainly organophosphorus compounds and carbamates, were tested on chrysanthemums as systemic protectants against Myzus persicae (Sulzer). The compounds were examined as foliar sprays, as soil drenches, and in some cases as granules incorporated into the potting compost. They were applied to the cultivar BGA Tuneful, grown as three plants to a 9-in. pot, generally at 0·01, 0·02 and 0·04% (a.i.) for sprays and at 50, 100 and 200 mg. (a.i.) per pot for soil treatments; they were also applied at the highest dosage to cultivars Bluechip, BGA Dawn Star and Fred Shoesmith. For the bioassays, aphids were caged on the upper leaves of the BGA Tuneful plants. The assays showed that the plants were rendered lethal to aphids for 8 weeks by soil drenches of menazon (400 mg./pot) and of thionazin (100 mg./pot), and for 7 weeks by drenches of vamidothion (200 mg./pot). Drenches of demeton-S-methyl (100 mg./pot) and of oxydemeton-methyl (50 mg./pot) were effective for 3–4 and 2–3 weeks respectively; as foliar sprays (0·02%) these two compounds protected the plants for about a week less. Other treatments were less satisfactory; none of the carbamates gave prolonged protection at non-phytotoxic dosages. Insecticides applied to the compost had a longer duration of activity than the same compounds as foliar sprays. No treatment gave complete protection from Tetranychus urticae (Koch).

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