Weed Management Handbook

Botanically, any plant of the Gramineae family. Grasses are characterized by narrow leaves with parallel veins; by leaves com- posed of blade, sheath, and ligule; by jointed stems and fibrous roots; and by inconspicuous flowers usually arranged in spikelets.

A dry formulation of herbicide in which the active ingredient is impregnated on small particles of carrier such as clay or ground corncobs.

Gallons per minute.

Gallons per acre.

Chemical used in the form of a volatile liquid or a gas to kill insects, nematodes, fungi, bacteria, seeds, roots, rhizomes, or entire plants; usually applied in an enclosure of some kind or in the soil with a plastic or water surface seal.

A mixture containing the active pesticide, the carrier, diluents, and other additives required to make the material ready for application.

Formulation made of finely ground herbicide particles that are suspended in a liquid, which is then diluted with water for application.

A seed bed that is prepared by tilling the soil well ahead of crop planting, and where tillage or other techniques are used to destroy emerged weeds before the crop is planted.

A compound formed by reaction of an acid and an alcohol accompanied by the loss of water formed during the reaction.

Twisting or curling of leaves and stems caused by uneven growth of cells. This is a characteristic reaction from treatment with 2,4-D and other growth regulators.