MINNEAPOLIS / ST. PAUL -- Milkweeds growing in cornfields sometimes support monarch butterfly larvae at the same time the corn is shedding its pollen, according to a survey of cornfields in the Midwest, Maryland and Ontario. The overlap implies that monarchs feeding next to corn genetically engineered to contain the insecticide known as Bacillus thuringiensis (Bt) toxin could be exposed to the toxin. The study, led by University of Minnesota ecologist Karen Oberhauser, is published on the Proceedings of the National Academy of Sciences Web site, www.pnas.org/papbyrecent.shtml, along with other papers dealing with monarchs and Bt toxin. The series of papers address the issue of whether "Bt corn" is harmful to monarchs in the field as well as in the laboratory.
The above story is based on materials provided by University Of Minnesota. Note: Materials may be edited for content and length.
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