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Organo-Chlor GROUP Thuốc trừ sâu hóa học đã có sẵn sau khi chiến tranh thế giới thứ II. - DDT là sản phẩm đầu tiên. - Các thuốc trừ sâu hữu cơ-Chlor đã được sau đó sản xuất. Chúng bao gồm C, H, O, S và Cl. | PESTICIDES Tran Van Hai Ph.D. Associate Professor Plant Protection Department College of Agriculture Biotechnology Can Tho University A. INSECTICIDES 3.1. ORGANO-CHLOR GROUP Chemical pesticides have been available after World War II. - DDT is the first product. - Other organo-chlor insecticides have been subsequently produced. They are composed of C H O S. and Cl. Advantages - Simply produced - Cheap - Diverse formulations soluble powder emulsifiable concentrate dust granular etc. - Easily applied in field conditions - Broad-spectrum high and long-term effect - Stable and therefore easily stored - Easily degraded in basic condition Disadvantages - Long-term persistence in soil and plants - Polluting environment - In natural conditions DDT totally degraded within ten years. - Persisting in food chains and residing mainly in adipose tissues of animal and human bodies - Having chronic toxicity and therefore causing cancers monstrosity etc. - Having high toxicity on fish and natural .