TY - JOUR
T1 - Managing Pests and Their Resistance to Bacillus thuringiensis
T2 - Can Transgenic Crops Be Better Than Sprays?
AU - Roush, Richard T.
PY - 1994
Y1 - 1994
N2 - Insecticidal toxins from Bacillus thuringiensis (Bt) can now be deployed either in sprays or transgenic plants. Some entomologists and environmentalists have argued that the sprays are preferable to plants because they are less likely to cause resistance. However, Bt sprays are not generally competitive with chemical insecticides and seem unlikely to displace them. In contrast, transgenic plants appear to be sufficiently effective to displace chemicals, making such plants attractive from the standpoint of environmental protection. Further, simulation models using data from the diamondback moth and a laboratory experiment using the Indianmeal moth suggest that under at least some circumstances, transgenic plants bearing only one Bt gene may be more effective than sprays for delaying resistance to Bt Resistance in a laboratory-selected strain of the Colorado potato beetle is especially interesting because a strain that can survive Bt sprays and develop to maturity cannot develop successfully on transgenic plants, not even on some showing very low expression. This suggests that more mechanisms are available for resistance to sprays than to transgenic plants, perhaps making resistance to sprays more ‘evolutionarily available’. When the use of two toxin genes is considered, simulation models suggest that transgenic plants may be much more durable than sprays of similar efficacy.
AB - Insecticidal toxins from Bacillus thuringiensis (Bt) can now be deployed either in sprays or transgenic plants. Some entomologists and environmentalists have argued that the sprays are preferable to plants because they are less likely to cause resistance. However, Bt sprays are not generally competitive with chemical insecticides and seem unlikely to displace them. In contrast, transgenic plants appear to be sufficiently effective to displace chemicals, making such plants attractive from the standpoint of environmental protection. Further, simulation models using data from the diamondback moth and a laboratory experiment using the Indianmeal moth suggest that under at least some circumstances, transgenic plants bearing only one Bt gene may be more effective than sprays for delaying resistance to Bt Resistance in a laboratory-selected strain of the Colorado potato beetle is especially interesting because a strain that can survive Bt sprays and develop to maturity cannot develop successfully on transgenic plants, not even on some showing very low expression. This suggests that more mechanisms are available for resistance to sprays than to transgenic plants, perhaps making resistance to sprays more ‘evolutionarily available’. When the use of two toxin genes is considered, simulation models suggest that transgenic plants may be much more durable than sprays of similar efficacy.
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U2 - 10.1080/09583159409355364
DO - 10.1080/09583159409355364
M3 - Article
AN - SCOPUS:0000086933
SN - 0958-3157
VL - 4
SP - 501
EP - 516
JO - Biocontrol Science and Technology
JF - Biocontrol Science and Technology
IS - 4
ER -