Chemicals transported in the phloem move both up and down the plant. Mode of Action. A brief description is given of how the chemical affects plant biochemistry. General classes of plants which are resistant to the effects of the chemical are presented in this section. For example, suppose that an application is made of 2 pounds of an active ingredient with a half-life of 30 days.
Toxicity is provided in reference to mammals and to fish.
It is expressed in milligrams of chemical for each kilogram of test-animal weight. LC 50 is the lethal concentration in water at which a chemical becomes lethal to 50 percent of a test population of fish. Active ingredients are often sold under one or more formulations. Trade names and manufacturers are also given. Additional Sources of Information Weed Science Society of America.