Abstract
From 99 to 70% early season control of Hylemya brassicae (Bouché) was obtained by granular treatments applied in or over rutabaga seed furrows at planting with the following insecticides in approximate decreasing order of efficiency: trichloronat, fonofos, Bayer 92114 (phosphoro-amidothioic acid, N-isopropyl-O-ethyl ester, O-ester with isopropyl Salicylate), Stauffer N2596 [S-(p-chlorophenyl) O-ethyl ethylphosphonodithioate], fensulfothion, chlorpyrifos and pirimphos-ethyl. These single treatments were less efficient (ca. 70% reduction of damage with the best treatments) for season-long control of the cabbage maggot on this crop. Stauffer N2596, fonofos, and fensulfothion reduced plant stands when applied as granules in direct contact with the seed. This effect was alleviated by placing the insecticide in a 1–2 in. band over the row, although fonofos still was somewhat detrimental, particularly on the sandier soil.
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