Rates, methods and persistence of insecticides for preventing carrot maggot damag

D. G. Finlayson, M. J. Brown, C. J. Campbell, I. H. Williams

Abstract


Fourteen carbamate and organophosphorus insecticides for preventing damage by carrot maggot, <i>Psila rosae</i> (Fab.), were applied as granules in the seed furrow at 2 locations in muck soil, and supplemented with 2, 3, 4, or 8 sprays of the same materials during the season. The spray applications were made at 40 and 70 days after seeding; 30, 50, and 70 days; 30, 50, 70, and 90 days; 40,70, and 100 days. Diazinon, the currently recommended treatment, was applied 8 times at lO-day intervals from 30 to 1OO days. All the granules except chlorfenvinfos and ethion reduced the number of emergent seedlings. The reduction was 40% in plots treated with diazinon, thionazin, Chemagro 7375, Nemacur, pirimiphos-methyl, and TD-8550. Maggot damage was negligible until 100 days after seeding, but by 160 days only plots treated with carbofuran, fensulfothion, ethion and 3 of the numhered compounds had less than 20% damage. Residues of pesticides in the carrots ranged from 0.12 ppm of ethion 30 days after the final application, to 1.28 ppm of thionazin 10 days after. Residues in carrots held in storage at 5∞C for 30, 60, and 90 days, increased with the period of storage, except those from plots treated with chlorfenvinphos.

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References


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