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Bt pesticide resistance
On Fri, 08 Aug 2003 05:48:09 GMT, "Moosh:}"
wrote: On Fri, 8 Aug 2003 06:18:46 +0100, Oz posted: Someone wrote: They fed resistant larvae of the diamondback moth - an increasingly troublesome pest in the southern US and in the tropics - on normal cabbage leaves and ones that had been treated with a Bt toxin. The larvae eating the treated leaves grew much faster and bigger - with a 56 per cent higher growth rate. .. Plants attacked by pests will elevate their toxin levels as a response. If the untreated plants were under attack (or their neighbours were) then they would increase their toxin level. .. It amazed me that such a tiny amount of one protein could produce such growth differences. Your explanation of growth inhibition from a predated crop certainly fits. It doesn't fit or explain anything at all, since the same cabbage leaf material was fed in all treatment groups in the experiment. The researchers grew a single cabbage crop, cut discs from its leaves, and fed the discs to different groups of larvae kept in petri dishes, with or without Bt toxin fortification. |
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