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DDT

(Encyclopedia) DDT or 2,2-bis( p -chlorophenyl)-1,1,1,-trichloroethane, chlorinated hydrocarbon compound used as an insecticide . First introduced during the 1940s, it killed…

Müller, Paul Hermann

(Encyclopedia) Müller, Paul Hermann pä´o͝ol hĕr´män mŭl´ər [key], 1899–1965, Swiss chemist, Ph.D. Univ. of Basel, 1925. He worked as a research scientist with J. R. Geigy A.G. in Basel…

tropical medicine

(Encyclopedia) tropical medicine, study, diagnosis, treatment, and prevention of certain diseases prevalent in the tropics. The warmth and humidity of the tropics and the often…

spraying

(Encyclopedia) spraying, horticultural practice of applying fungicides, insecticides, and herbicides, usually in solution, to plants. It may be accomplished by various means, e.g., the…

tsetse fly

(Encyclopedia) tsetse fly tsĕt´sē [key], name for any of several bloodsucking African flies of the genus Glossina, and in the same family as the housefly . The…

osprey

(Encyclopedia) osprey ŏs´prē [key], common name for a fish-eating bird of prey found near water in most parts of the world. The osprey, or fish hawk, Pandion haliaetus, has…

pesticide

(Encyclopedia) pesticide, biological, physical, or chemical agent used to kill plants or animals that are harmful to people; in practice, the term pesticide is often applied only to…

insecticides

(Encyclopedia) insecticides, chemical, biological, or other agents used to destroy insect pests; the term commonly refers to chemical agents only. Chemical Insecticides…

Sierra Club

(Encyclopedia) Sierra Club, national organization in the United States dedicated to the preservation and expansion of the world's parks, wildlife, and wilderness areas. Founded (…

organic farming

(Encyclopedia) organic farming, the practice of growing plants—especially for fruits and vegetables, but for ornamentals as well—without the use of synthetic pesticides, herbicides, and…