الفهرس 
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Abstract
Brief History of Pesticides Chemical Use:
Early materials used to control pests were crude inorganic compounds that functioned primarily as cuticle poisons; for example, ashes, soot and sulphur which owed their efficacy to cuticle abrasion causing dessication and death to the pests.
The first insect stomach poison. was probably arsenic which was mixed with honey in the mid-1600’s as an ant bait. In 1892 arsenate was introduced as one of the most effective inorganic insecticide for insects. Perhaps the first organic insecticide was nicotine that was applied in its natural form as early as 1763. Rotenone, present in the roots of over 60 different plant species was used as fish poison in South America and still sold today.
The most successful
botanical insecticide was
Pyrethrum; a mixture of a natural ester extracted from chrysanthemum flowers. Chemical insect control changed dramatically following the discovery of DDT. The organochlorine compounds revolutionized around the world.
insect control
During the period 1940-1950 almost paralleling the development of DDT during world war II, was the discovery.