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BACKGROUND: The crayfish Procambarus clarkii inflicts severe ecological and economic damages in Europe. To develop an efficient method for its control, four experiments were carried out to assess the impact of natural pyrethrum (i.e. Pyblast) on crayfish: (1) the 24 h LC100 and LC50 were quantified on crayfish; (2) the breakdown time of the 24 h LC100 was assessed using Daphnia magna as a bioindicator;...
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