Global warming may create superweeds

03/28/2008 02:00:00 AM

Global warming may be fueling a new generation of more aggressive weeds, according to recent research by the Weed Society of America.

One of the major characteristics of a warming planet is an increase in the amount of carbon dioxide in the atmosphere. Rising carbon dioxide has been shown to help vegetable and grain crops grow more quickly, become more drought resistant and produce potentially higher yields.

Unfortunately, though, the impact of rising carbon dioxide seems to be far more pronounced in the weeds that compete with crops than in the crops themselves, says Lee Van Wychen, director of science policy for the Lenexa, Kan.-based society.

"Weeds are survivors," he says. "They can fill various niches and thrive under a wide range of conditions. While we have about 45 major crops in the U.S., there are more than 400 species of different weeds associated with those crops. 

"There is always another weed species ready to become a major competitor with a crop if growing conditions change, such as an increase in carbon dioxide levels."

The effects of rising carbon dioxide levels on weeds can be striking. In a study conducted by Lewis Ziska, a plant physiologist with U.S. Department of Agriculture's Agricultural Research Service in Beltsville, Md., weeds grown under urban conditions of warmer temperatures and more carbon dioxide—conditions anticipated for the rest of the world in 50 years—grew to the height of those in a country plot 40 miles outside the city, where carbon dioxide and temperature reflected background conditions.

His research shows that common ragweed plants exposed to higher levels of carbon dioxide dramatically increased the amount of pollen they produced. A doubling in carbon dioxide led to a quadrupling of pollen. 

Some people are allergic to ragweed pollen, resulting in the hay fever response, including sneezing and watery eyes. Additional work by Ziska also suggests that even recent increases in carbon dioxide during the past 50 years may have led to bigger poison ivy plants with a more virulent form of the oil that causes people to break out in a rash.

"As the climate and carbon dioxide levels change, we can no longer assume the weed control strategies we used in the past will continue to work," Ziska says. "Not only are some of the nation?s most invasive weeds spreading, but they are becoming more difficult and costly to control. Understanding the impact of increasing carbon dioxide on weed control is still in its infancy. While researchers explore new approaches, we will need to mix and match the strategies currently available."

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