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Essential oils extracted from ten different plants belonging to five families were tested against the 3rd nymphal instars of the desert locust, Schistocerca gregaria (Forskål) (Orthoptera: Acrididae) by topical application technique. Also, the toxicity of four chemical insecticides, as well as the joint action resulted from mixing botanicals and insecticides were evaluated. Either at LD50 or LD90...