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Laboratory bioassays have become increasingly important because of their predictive value, generating comparative toxicity data on many chemicals in relatively short times at relatively low expense. The laboratory investigations provide a better understanding of insect-insecticide or insect-plant-insecticide interactions. It is a simple, versatile, easy and sensitive technique for determining toxicity of wide range of chemicals, which greatly facilitates the determination of the LD50, LC50 or any other lethal concentration/dose. The objective of present reviews is to know the different laboratory bioassay techniques for evaluation of different insecticide against insect pests.