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Studies of the disappearance of nine pesticides on celery and lettuce grown on muck soils in Ontario, 1977–1980 by Heinz E. Braun; Gwen M. Ritcey; Brian D. Ripley; Freeman L. McEwen; Richard Frank is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract Nine experiments involving seven insecticides and two fungicides were conducted with celery and lettuce between 1977 and 1980 in order to provide data which would confirm or up‐date the current recommendations for registered compounds, and also to provide data on the disappearance rates of alternative non‐registered insecticides. Endosulfan, applied to celery at a rate of 0.8 kg ha^−1^, required 14 days to decline below the tolerance level of 1.0 mg kg^−1^; residues of methomyl on celery declined below the tolerance level of 2.0 mg kg^−1^ within the first 3 days. Parathion, when applied as an emulsifiable concentrate to celery, required greater than 21 days to decline to the tolerance level of 0.7 mg kg^−1^, compared with 10 days when applied as a wettable powder. Applications of parathion on celery, at repeated weekly intervals at a rate of 0.3 kg ha^−1^, produced significantly higher initial residues with five applications than when one or three applications were made; after 10 days from the terminal application, there were only slight differences in residue levels. Maneb and zineb residues declined below tolerance levels within 3–7 days following application. Alterna

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Author

Heinz E. Braun; Gwen M. Ritcey; Brian D. Ripley; Freeman L. McEwen; Richard Frank

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1526-498X)

Published

1982

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)