Abstract
Abstract Sowing seed mixtures of transgenic and nontransgenic plants is one approach to establishing refuges for resistance management of crops transformed with Bacillus thuringiensis (Bt) toxins. We studied larval dispersal and survival of two rice stem borers, Scirpophaga incertulas (Walker) and Chilo suppressalis (Walker), to evaluate the potential effectiveness of seed mixtures for resistance management of Bt rice, Oryza sativa L. Experiments were conducted with two cry1Ab-transformed rice varieties, ‘IR58’ and ‘Tarom Molaii’, and corresponding nontransgenic controls. During 0–24 and 24–48 h after egg hatch, the proportion of C. suppressalis larvae dispersing from the natal plant did not differ between transgenic and control plants for either rice variety. Dispersal by S. incertulas did not differ between transgenic and control plants of IR58 during either 0–24 or 24–48 h, but a greater proportion of S. incertulas larvae dispersed from transgenic Tarom Molaii than from control plants 24–48 h after ecl...
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