I can't resist opening a good can of worms.
Actually quite a lot of cotton grown in North America is genetically engineered and produces a bacterial pesticide within itself, so it requires very little in the way of spray pesticides now.
However, given concerns about; quicker evolution of resistant insects due to how successfully the 'natural' bacterial pesticide works, large firms such as Monsanto having a virtual monopoly on specific crops (including cotton) due to the US patent system allowing patents of genes, introducing genetically modified plants into the eco-system at all, etc. You may still favour the other farming practices. ;)
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