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Bt pesticide resistance
"Walter Epp" wrote in message ... "Moosh:]" wrote: On 29 Jul 2003 08:52:24 GMT, Brian Sandle posted: As we discussed with DDT, anything used for too long breeds resistant creatures. So? The point is that the use of BT in the plant and on the plant is hardly different. When the insects are not present, they can't be developing resistance. Where is there a place without insects? Welcome to the real world, where things are not black and white, where we don't have either 0 or trillions of insects but varying degrees inbetween, where not all insects are dumb enough to keep eating bt until they've got a fatal dose but different ones eat different amounts and so trigger varying amounts of selective pressure. We have eliminated some insects. The new world screw worm fly has been killed back to the Panama canal and it use to range in to Kansas in the fall. It appears that with BT cotton, cultural practices, spraying scents that disrupt their breeding and releasing sterile males will do the job. http://www.soybeandigest.com/ar/soyb...pink_bollworm/ Once that is done that insect no longer needs any control measures unless that is a population in Mexico that we have to keep pushed back. And Mexico has been very cooperative on working with us on pest control. Unfortunately that won't work on common boll worms because they will eat about any thing there is. Gordon |
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