Effects on weed and invertebrate abundance and diversity of herbicide management in genetically modified herbicide-tolerant winter-sown oilseed rape.

Abstract

We evaluated the effects of the herbicide management associated with genetically modified herbicide-tolerant (GMHT) winter oilseed rape (WOSR) on weed and invertebrate abundance and diversity by testing the null hypotheses that there is no difference between the effects of herbicide management of GMHT WOSR and that of comparable conventional varieties. For total weeds, there were few treatment differences between GMHT and conventional cropping, but large and opposite treatment effects were observed for dicots and monocots. In the GMHT treatment, there were fewer dicots and monocots than in conventional crops. At harvest, dicot biomass and seed rain in the GMHT treatment were one-third of that in the conventional, while monocot biomass was threefold greater and monocot seed rain almost fivefold greater in the GMHT treatment than in the conventional. These differential effects persisted into the following two years of the rotation. Bees and Butterflies that forage and select for dicot weeds were less abundant in GMHT WORS management in July. Year totals for Collembola were greater under GMHT management. There were few other treatment effects on invertebrates, despite the marked effects of herbicide management on the weeds.

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@article{Bohan2005EffectsOW, title={Effects on weed and invertebrate abundance and diversity of herbicide management in genetically modified herbicide-tolerant winter-sown oilseed rape.}, author={David A. Bohan and Caroline W H Boffey and David R. Brooks and Suzanne J. Clark and Alan M Dewar and Les G Firbank and Alison J Haughton and Cathy Hawes and M S Heard and Mike J. May and Juliet L Osborne and J. N. Perry and Peter Rothery and David B Roy and Rod J . Scott and Geoff R. Squire and Ian P. Woiwod and G. T. Champion}, journal={Proceedings. Biological sciences}, year={2005}, volume={272 1562}, pages={463-74} }