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Farmer Mark Nelson bends down and yanks a four-foot-tall weed from his northeast Kansas soybean field. The "waterhemp" towers above his beans, sucking up the soil moisture and nutrients his beans need to grow well and reducing the ultimate yield. As he crumples the flowering end of the weed in his hand, Nelson grimaces. "When we harvest this field, these waterhemp seeds will spread all over kingdom come," he said. Nelson's struggle to control crop-choking weeds is being repeated all over America's farmland. An estimated 11 million acres are infested with "super weeds," some of which grow several inches in a day and defy even multiple dousings of the world's top-selling herbicide, Roundup, whose active ingredient is glyphosate.

The U.S. ethanol industry is keeping its foot on the gas pedal at production plants, and if the trend continues it could defy a government forecast that the industry will have its first drop in corn use since the turn of the century. The government forecast, which was issued on Monday, was based on expected weaker gasoline use and higher corn prices. Ethanol is blended with gasoline. In addition, some analysts said the expiration of an industry tax credit at the end of the year could also eat into profits.

Monsanto Co. is working with a "handful" of farmers to rein in problems with corn pests that appear to be growing resistant to the company's popular corn seed product that is genetically engineered to protect against insect damage. Recent news reports of resistance problems in top corn-producing states of Iowa and Illinois have fueled investor concerns. The company is already struggling to address weed resistance problems related to its herbicide-tolerant genetically altered crops.

Significant levels of the world's most-used herbicide have been detected in air and water samples from two U.S. farm states, government scientists said on Wednesday, in groundbreaking research on the active ingredient in Monsanto Co's Roundup. "It is out there in significant levels. It is out there consistently," said Paul Capel, environmental chemist and head of the agricultural chemicals team at the U.S. Geological Survey Office, part of the U.S. Department of Interior.

Dow AgroSciences, a unit of chemical conglomerate Dow Chemical is launching a genetically altered soybean seed aimed as a direct assault on the dominance of global seed leader Monsanto Co. Dow submitted a regulatory package on Friday seeking government approval for a glyphosate-tolerant soybean that the company says would be the "first-ever, three-gene," herbicide-tolerant soybean. The new soybean will be tolerant of a new Dow AgroSciences herbicide that combines glyphosate, glufosinate and 2,4-D so farmers can spray the weedkiller on fields without harming the crop.

 The heavy use of Monsanto's Roundup herbicide appears to be causing harmful changes in soil and potentially hindering yields of the genetically modified crops that farmers are cultivating, a government scientist said on Friday. Repeated use of the chemical glyphosate, the key ingredient in Roundup herbicide, impacts the root structure of plants, and 15 years of research indicates that the chemical could be causing fungal root disease, said Bob Kremer, a microbiologist with the U.S. Department of Agriculture's Agricultural Research Service.

Monsanto Co. will begin farm trials of its drought-tolerant corn seed next spring, marking the global seed giant's first roll-out of seeds genetically engineered for harsh environmental conditions. The introduction comes as drought and searing heat this summer have withered crops across the U.S. South. The new biotech corn seed still needs water to grow healthy plants, but is designed to use moisture more efficiently, said Monsanto global corn technology lead Dusty Post.

As head of the world's largest seed company, Monsanto Chairman Hugh Grant is on a global quest for growth. And with the U.S.-based company's footprint firmly planted in the United States, that pursuit has turned south. South America, particularly Brazil, is a top growth target now, Grant said in an interview with Reuters this week. Friendly regulators, an influx of public and private investment into Brazilian agriculture and a population of farmers eager to help feed a hungry world are among the factor spurring the agricultural conglomerate to intensify its efforts there, Grant said.

Monsanto Co. is preparing to launch a genetically altered sweet corn, marking the global seed company's first commercial combination of its biotechnology with a consumer-oriented vegetable product. The sweet corn seed, which will be available to farmers this fall, has been genetically altered to tolerate treatment of Monsanto's Roundup herbicide, and to fight off insects that might attack the plants, said Consuelo Madere, Monsanto vice president of the company's global vegetable business.

Global agribusiness company Monsanto Co (MON.N) posted a nearly 80 percent jump in net income on Wednesday due to strong sales in its core seeds and genetic traits businesses. Shares rose nearly 5 percent as the market applauded the company's sales strength in the United States and Latin America and an expanded earnings outlook for the full year. Total sales of Monsanto's specialized corn, soybean, cotton and other seeds and traits rose 12 percent to $2.6 billion in the quarter.