New Zealand Plant Protection 64 (2011): 49-54
European earwigs are sensitive to the residues of broad-spectrum insecticides. More earwigs are found on organically-managed than on conventionally-managed kiwifruit orchards. Since 2007 there have been changes in insecticide use on kiwifruit orchards. In particular, the broad-spectrum insecticide diazinon was replaced by so-called “reduced-risk” insecticides. In the current study earwig numbers were measured in nine conventionallymanaged and seven organically-managed orchards for 4 years (2006-07 to 2009-10). Numbers of earwigs on orchard blocks under organic management did not differ between years and were initially higher than on conventionally-managed orchard blocks. There was a trend for earwig numbers to increase on conventionally-managed orchard blocks. Earwig abundance decreased by approximately 60% with each spray application after allowing for differences between years.
Keywords: European earwig, diazinon, insecticide residues, population.
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