Results of three-fifths of the tests conducted for the control of the carrot rust fly, Psila rosae (F.), were discarded as unreliable because of low or irregular infestations in the check plots. Control of the first generation attacking early carrots was obtained with foliage sprays of chlordane, aldrin, dieldrin, or lindane applied when the adults appeared in the field and 10 days later. The foliage was burned and the yields were lower when the plants were sprayed with a weed killer and an insecticide combined. A preplanting soil treatment of aldrin or chlordane as a dust, granulated dust, or emulsifiable concentrate at 6 pounds of toxicant per acre gave excellent control of the second generation on late carrots; dusts of heptachlor, parathion, and dieldrin also gave excellent protection. A preplanting soil application of anyone of the above insecticides to early carrots in May satisfactorily protected these carrots in the autumn. Of the several insecticides tested as foliage dusts and sprays and as seed and furrow treatments against the second generation, only parathion as a foliage spray or as a seed treatment was effective; however, this insecticide is not recommended in Ontario because of its high mammalian toxicity.
Document Type: Research Article
Publication date: April 1, 1958
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.