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nature : in the use of pesticides to control insect pests of work, in order to enhance efficacy and improve the Pharmacy Control, often mixed pesticide use. After mixing pesticides, would change the toxicity, which changed the toxicity of pesticides known as joint toxicity. There are three basic types : (a) the sum, the toxicity of the mixture to the toxicity of pesticides were combined; (2) increasing the toxicity, the toxicity of pesticide mixed LD50 less than the difference between the toxicity of pesticides; (3), also known as the antagonistic effect inhibition, mixed LD50 pesticide toxicity greater than the toxicity of the pesticide. For example, malathion acute oral LD50 to 1182 mg / kg, rice blast net LD50 to 242 mg / kg. If malathion and net hybrid rice blast, on the basis of actual results, LD50 to 72.9 mg / kg, alone are much more toxic, which belongs to the increasing toxicity.
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