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Development time of generalist herbivores and parasitoids as a function of genotype mean leaf iridoid glycoside (IG) concentration in the food plant Plantago lanceolata. Left panels: mean larval development time of Chrysodeixis chalcites (a) and its parasitoids Cotesia marginiventris (c) and Hyposoter didymator (e). Right panels: mean pupal development time of Spodoptera exigua (b) and the same two parasitoids (d, f). Note the square-root scale of the X-axis
