He saw that he was holding a can of weed-killing powder.

The company also does work to assess what characteristics a new weed-killing product should have in order to appeal to consumers.

That would be a problem for farmers because glyphosate is by far the most popular weed-killing chemical in the world.

A weed-killing train ran in 1983 and track-lifting trains ran the following year.

During the winter, when the rye decomposes, natural weed-killing substances result, protecting the fields in the spring and making the use of chemical herbicides unnecessary.

Weed-killing duties were not carried out during the Second World War, and the vehicles were not refurbished subsequently.

"I demand that this woman be held for questioning and that the bottle containing her weed-killing solution be seized and analyzed," Matthew Luzon said.

For example, Monsanto , a leading producer of agricultural chemicals, expects to introduce genetically engineered plants that can resist certain diseases and insects or tolerate weed-killing pesticides by the mid-1990's.

Some of the new plants, such as tobacco and petunias, are designed to produce their own natural pesticides, reducing the need to spray toxic chemicals; others have been altered to be tolerant of weed-killing defoliants.

This investigation and testing evaluates the weed-killing performance and other relevant characteristics of the formulations (for example, toxicity to humans and wildlife, water solubility, adhesion to weeds, damage done to other plants).

The promise of genetic engineering has set off a "gene rush" as breeders seek to identify and control plant genes for a variety of traits - resistance to disease or frost, say, or to weed-killing chemicals.

But biotech crops - genetically altered to do things like release their own insecticide or withstand the spraying of weed-killing chemicals - are being shipped or experimented with in many other countries, including China, India, Australia and South Africa.

Washington, D.C. - Congressman Keith Ellison (D-MN) observed the 40th anniversary of Earth Day by introducing a bill to ban a weed-killing agricultural pesticide known as atrazine due to its documented toxicity.