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Landscape change leads to increased insecticide use in the Midwest
Date:7/11/2011

MADISON - The continued growth of cropland and loss of natural habitat have increasingly simplified agricultural landscapes in the Midwest. A Great Lakes Bioenergy Research Center (GLBRC) study concluded that this simplification is associated with increased crop pest abundance and insecticide use, consequences that could be tempered by perennial bioenergy crops.

While the relationship between landscape simplification, crop pest pressure, and insecticide use has been suggested before, it has not been well supported by empirical evidence. This study, published online in the Proceedings of the National Academy of Sciences during the week of July 11, is the first to document a link between simplification and increased insecticide use.

"When you replace natural habitat with cropland, you tend to get more crop pest problems," says lead author Tim Meehan, University of WisconsinMadison associate scientist in the Department of Entomology. "Two things drive this pattern. As you remove natural habitats you remove habitat for beneficial predatory insects, and when you create more cropland you make a bigger target for pests giving them what they need to survive and multiply."

Because landscape simplification has long been assumed to increase pest pressure, Gratton and Meehan were not surprised to find that counties with less natural habitat had higher rates of insecticide use.

One striking finding was that landscape simplification was associated with annual insecticide application to an additional 5,400 square miles in the Midwest an area the size of Connecticut.

Although simplification of agricultural landscapes is likely to continue, the research suggests that the planting of perennial bioenergy crops like switchgrass and mixed prairie can offset some negative effects.

"Perennial crops provide yearround habitat for beneficial insects, birds, and other wildlife, and are critical for buffering streams and riv
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Contact: Claudio Gratton
cgratton@wisc.edu
608-265-3762
University of Wisconsin-Madison
Source:Eurekalert

Page: 1 2

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