Abstract
Of 27 insecticides tested in Maryland for control of larvae of the alfalfa weevil Hypera postica (Gyll.)), aldrin, dieldrin, endrin, heptachlor, and Thiodan® (6,7,8,9,10, 10-hexachloro-1,5a, 6,9,9a- hexahydro-6,9,-met hano-2,4,3-benzodioxathiepin-3-oxiele) were the most effective. Sprays containing 4 ounces of heptachlor per acre applied in late April provided better control than sprays applied earlier or later. Little difference in control was obtained when .5, 10, or 20 gallons of water were used. Granular insecticides alone or mixed with fertilizer were less satisfactory and required heavier dosages, Mixtures were generally more effective than a single insecticide to control simultaneously the alfalfa weevil, pea aphid (Macrosiphum pisi (Harr.)), and meadow spittlebug (Philaenus leucopthalmus (L.)).
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