[Editor’s Note: Weeds are one of the biggest threats to crops. Farmers use more weed killer than any other kind of pesticide. Recently, Monsanto acquired the rights to use the gene editing tool CRISPR to genetically engineer crops. Faye Flam writes in BloombergView about the age old battle against weeds and asks whether CRISPR will lead to increased use of weed killers.]
Tom Adams, Monsanto’s vice president for biotechnology, said the company could employ gene editing to endow plants with resistance to drought, viruses, fungi or insects. But there’s no known way to engineer a corn plant that can kill weeds directly…. So herbicides are still part of the package.
And although the new technology offers efficiency and flexibility, it doesn’t prevent weeds from evolving resistance. … Chemicals work well for a year or so, but then nature fights back with resistant weeds, and the farmers respond with more chemicals.
. . . .
Increasing use of herbicides is not only expensive for farmers, it raises concern among some scientists because the chemicals can get suffused through the environment. … “We should be taking a critical look at technologies that enable increased reliance on pesticides,” [Iowa State University biologist Michael Owen] said. That includes CRISPR.
For [some] scientists … the way to win the war on weeds is to diversify tactics. For them, that means combining limited herbicide use with a variety of techniques, including tillage, crop rotation and planting of certain cover crops….
The GLP aggregated and excerpted this blog/article to reflect the diversity of news, opinion and analysis. Read full, original post: Farmers Have Tech. Weeds Have Evolution.