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Efficiency of the HD/R strategy with Bt plants expressing one or two toxins with low concentration. These simulations are performed for Bt plants expressing one or two toxins with initially rare resistance alleles (Ar Freq = Br Freq = 0.0015) and a 5% refuge zone. But the toxin concentration varies (sBtA and sBtB = 0.50 or 0.93 or 1) involving a variation of the dominance of the resistance allele (hAr and hBr = 0.53 or 0.23 or 0).
