NZPPS   ·  Journal home   ·   Past issues  ·  This volume   ·   Previous abstract   ·   Next abstract

New Zealand Plant Protection 64 (2011): 49-54

Increased numbers of earwigs (Forficula auricularia) in kiwifruit orchards are associated with fewer broad-spectrum sprays

D.P. Logan, B.J. Maher and P.G. Connolly


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.

Related articles
pdfSusceptibility of the European earwig, Forficula auricularia, to insecticide residues on apple leaves
P.W. Shaw and D.R. Wallis (2010)
New Zealand Plant Protection 63: 55-59
pdfEffect of pre- and post-blossom insecticide residues on European earwig, Forficula auricularia, in kiwifruit
B.J. Maher and P.G. Connolly (2009)
New Zealand Plant Protection 62: 413
pdfEuropean earwigs, Forficula auricularia, and predation of scale insects in organic and conventionally managed kiwifruit
B.J. Maher and D.P. Logan (2007)
New Zealand Plant Protection 60: 249-253
pdfEffect of mineral oil and diazinon residues on the predator European earwig, Forficula auricularia, in kiwifruit
B.J. Maher, D.P. Logan and P.G. Connolly (2006)
New Zealand Plant Protection 59: 202-207

Copyright © 2011 New Zealand Plant Protection Society (Inc.).

Please refer to the terms of use.