> Removal of extrafloral nectaries from cotton decreased field populations of ... insects.

I presume this is the real reason they developed nectarless cotton, it's less attractive to insect pests. The side effect was no honey for beekeepers. I would say that cotton is a pretty risky crop to put bees on, in any case. 

I have also heard that there are varieties of buckwheat that produce very little nectar. Again, this could simply be a side effect of breeding for some other trait, such as hardiness or disease resistant. 

The take home message is that when one breeds for one desirable trait, one may lose another. For example: you might breed mite resistant bees but lose traits that promote honey hoarding. 

PLB

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