Scientists urge policymakers to think broadly about biofuel crops
Research suggests that growing more corn to produce ethanol -- which creates less diverse landscapes -- reduces the ability of beneficial insects to control pests, according to scientists at the Michigan Agricultural Experiment Station (MAES).
“Corn is a less favorable habitat for many ladybird beetles [ladybugs] and other beneficial insects that feed on pests such as the soybean aphid,” said Doug Landis, MAES entomology scientist. “As we plant more corn, we reduce the ability of that landscape to supply beneficial predators to control pests in soybeans and other crops. This results in increased pesticide use and yield losses.”
From 2006 to 2007, a 19 percent increase in corn acreage in the United States reduced landscape diversity in many areas, the scientists said.
“Overreliance on any one crop is likely to reduce the value of natural control of pest insects by beneficial insects,” said Scott Swinton, MAES agricultural, food and resource economist.
Both Landis and Swinton are members of the Great Lakes Bioenergy Research Center, a partnership between Michigan State University and the University of Wisconsin-Madison funded by the U.S. Department of Energy (DOE) to conduct basic research aimed at solving complex problems in converting natural materials to energy.
The researchers say that achieving the biofuel production levels mandated by Congress will take millions of acres to provide the necessary raw materials and will change agricultural landscapes. Understanding how these landscape changes affect the sustainability of biofuel production is the overall goal of the research.
--Kelli




