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I think there needs to be more study into them before they should be introduced into the wild and allowed to pollinate freely.
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The same can also be said for organic growing methods as the pesticides used in organic farming are largely derived from natural reseources but are still toxic to many of the ecosystem's animals, birds and fish but the full effects are not always researched in the same way as their synthetic counterparts (to be fair not all organic farmers use these chemicals and instead realy on better planning). I think there are 7 or 8 approved chemicals.
Also synthetic pesticides can be created that target only specific insects/diseases and do not effect other animals.
I think it's better to have a tree/plant that is bred to have resistance to a specific bug/disease so that it does not require any treatment of any kind and therefore does not effect the ecosystem so such a great extent. But it true that more research is needed, the problem is that the anti-GM brigade do their best to disrupt any serious research which is a shame.
Some sources of interesting info regarding the subject
http://www.defra.gov.uk/FARM/organic...lan/annex3.htm - point 7
http://www.quackwatch.org/01Quackery...s/organic.html