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Survivorship of black swallowtails on Bt-, control-, and non-Bt pollen-treated leaf disks of wild parsnip. At the end of the third day, only the Max 454 pollen caused significant mortality compared with the acetone control (X2 = 31.4, P < 0.0001) and non-Bt Pioneer variety (X2 = 38.9, P < 0.0001).
