"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