Governments have sprayed herbicides on fields of coca leaf.

The most common uses of hiboys are for detasseling, spraying herbicides, and applying Roundup directly to weeds growing above crop height with a wick or wiper.

In the past, the city has relied on mechanical mowing, spraying herbicides and pesticides and pulling weeds by hand.

They argue that the war canno be won simply by spraying herbicides on Bolivian or Peruvian coca fields, or by extradition of Colombian traffickers.

This month, in the first such operation in Paraguay, American planes sprayed herbicides on 750 acres of marijuana.

We sprayed herbicides and pesticides and laid down fields with ammonium nitrate (the stuff terrorists use in big bombs) to increase yields.

The department uses a 54 page manual that sets guidelines and rules for landscaping, wildflowers, mowing, and spraying herbicides and pesticides.

With no planes to chase, Mexican commanders have used the helicopters for everything from troop transport to spraying herbicides on drug crops.

Control is focused on hand pulling Verbesina in sensitive areas where wetlands and high densities of native plants occur, and spraying appropriate herbicides.

State environmental officials are trying to keep it in check by spraying herbicides and releasing European beetles that eat its leaves.