Seed Treatments Compared with Other Methods for Controlling the Onion Maggot1

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Abstract
Recent experiments on control of Hvlemva antiqua in Minnesota indicate that heptachlor, dieldrin, and aldrin are all effective with several methods of application. Pelleting onion seeds with an insecticide-fungicide mixture gave effective control of the onion maggot from planting until harvest. Either 4 oz. 25% heptachlor, 2 oz. 50% dieldrin, or 2.5 oz. 40% aldrin was mixed with 4 oz. 50% thiram and pelleted on 1 lb. of onion seeds with 3 to 3.5 oz. 4% methyl cellulose. Dry mixes containing 2 oz. of either 50% dieldrin or 75% aldrin and 2 oz. 50% thiram per lb. of onion seeds without sticker gave good control of the onion maggot. Broadcast applications of heptachlor or aldrin applied at 3 to 4.5 lb. actual insecticide per acre and worked into the top inch or 2 of soil gave results similar to those obtained with pelleted seed. Post-emergence sprays were much less effective than the other methods of application.

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