Predicting longer-term changes in weed populations under GMHT crop management

A - Papers appearing in refereed journals

Heard, M. S., Rothery, P., Perry, J. N. and Firbank, L. G. 2005. Predicting longer-term changes in weed populations under GMHT crop management. Weed Research. 45 (5), pp. 331-338.

AuthorsHeard, M. S., Rothery, P., Perry, J. N. and Firbank, L. G.
Abstract

The UK Farm Scale Evaluations (FSE) compared the effects on biodiversity of management of genetically modified herbicide-tolerant (GMHT) crops and conventional crops over the shorter term. We simulated population changes over seven 4-year rotations (28 years) for weeds in crop rotations that included cereals and spring-sown GMHT and conventional oilseed rape and beet, using FSE data and assuming the continuation of the weed management systems practised in the FSE. The weed density dependence that was modelled integrated change caused by population dynamics and farmers' responses to changes in weed density. Predicted weed seed populations decreased under conventional management and at a greater rate under GMHT. Total seed densities were lower for GMHT cropping by a factor of 0.7-0.8. The predicted distributions of weeds had more fields with lower weed densities under GMHT cropping. Such changes could affect animal populations on farmland, depending on the scale of uptake of GMHT crop cultivars.

KeywordsAgronomy; Plant Sciences
Year of Publication2005
JournalWeed Research
Journal citation45 (5), pp. 331-338
Digital Object Identifier (DOI)doi:10.1111/j.1365-3180.2005.00465.x
Open accessPublished as non-open access
Funder project or code510
ISSN00431737
PublisherWiley

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