Picky pests

 作者:申屠啥     |      日期:2019-03-06 02:12:09
By Joanna Marchant THE spread of insect resistance to the toxins in genetically modified crops will not be slowed by encouraging pests to live in “refuges” of weeds around the edges of farmers’ fields, say French scientists. The vulnerable insects that live there just don’t mix with their resistant neighbours, the investigators have found. Bt maize produces a bacterial toxin that kills pests such as the European corn borer. But if it’s used extensively, insects rapidly become immune to the toxin. The solution in the US, where Bt maize is routinely grown,