Erosion of azinophosmethvl from apple leaves by rain and overtire irrigation

A. D. McMechan, C. V. G. Morgan, G. A. Wardle


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.

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