Herbicides

The Effect of Herbicides

Although some work has been done on the effect of 2,4-dichlorophenoxyacetic acid (2,4-D) on the numbers and kinds of organisms of the soil (Smith, Dawson and Wenzel, 1945; Hoover and Colmer, 1953), on respiration of certain soil organisms (Magee, 1954), and on the effect of this herbicide on certain processes of the soil (Newman, 1947; Jones, 1948; Carlyle and Thorpe, 1947; and Payne and Fults,...

Herbicides in Aquatic Systems

Natural products as herbicides

Plants and microbes contain a largely unexploited storehouse of phytotoxins that might be used directly or as structural indicators for new synthetic herbicides. Several factors have increased the interest of the herbicide industry in this source of natural products as herbicides. Natural compounds have made a large impact in the area of insecticides, whereas relatively minor successes have bee...

phenoxy herbicides: preliminary observations

Objectives-To evaluate short term immunological changes after agricultural exposure to commercial formulations of chlorophenoxy herbicides. Methods-Blood samples were collected from 10 farmers within seven days before exposure, one to 12 days after exposure, and again 50 to 70 days after exposure. Whole blood was used to count lymphocyte subsets with monoclonal antibodies. Peripheral blood mono...

Herbicides in Southern Forestry

Environmental interest groups have traditionally equated herbicide use with degradation of water quality. If the entire water quality picture is rationally analyzed. the conclusions are quite the contrary. Use of herbicides compared to mechanical site preparation improves or maintains water quality. Short-duration pulses of residues may appear in streamflow. but data from forest ecosystem studi...