Erosion of azinophosmethvl from apple leaves by rain and overtire irrigation

Authors

  • A. D. McMechan Research Station, Canada Department of Agriculture Summerland, B.C.
  • C. V. G. Morgan Research Station, Canada Department of Agriculture Summerland, B.C.
  • G. A. Wardle Research Station, Canada Department of Agriculture Summerland, B.C.

Abstract

Three sprays of azinphosmethyl wettable powder were applied for seasonal control of the codling moth, <i>Laspeyresia pomonella</i> (L.), in a semidwarf apple orchard. A rain of l.75 cm, occurring 6 hours after a spray application, removed 41% of the deposit from the leaves; a rain of l.00 cm, occurring 16 days after an application, did not remove any residue. Residues in the treetops were eroded more rapidly in blocks with overtree irrigation than in those with undertree irrigation. But there was no difference in the erosion rate in the overtree-irrigated orchard whether 5.1 cm of water was applied biweekly or 2.5 cm was applied weekly. There was a trend to poorer control of the codling moth with overtree irrigation.

References

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Gunther, F.A., D. L. Lindgren, M.I. Elliot, and J.P. Ladue. 1946. Persistence of certain DDT deposits under field conditions. J. Econ. Entomol. 39:624-627.

Linskens, H.F., W. Heinen, and A.L. Stoffers. 1965. Cuticula of leaves and the residue problem. Residue Rev. 8:136-178.

Miles, J.R.W. 1964. A new colorimetric method for determination of residues of Guthion and Ethyl Guthion and their oxygen analogs. J. Ass. Off. Agric. Chem. 47:882-885.

Williams, K. 1961. Note on the effect of rain, and sprinkler irrigation, on the persistence of spray residues of Guthion and Sevin on apple leaves. Can. J. Plant Sci. 41:448-451.

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Published

2019-08-28

Issue

Vol. 69 (1972): Journal of the Entomological Society of British Columbia

Section

Articles

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