[redgolum]

Even before GM crops were adopted, milkweed was never overly abundant. Farmers found only “30 or 40 stems per acre,” said Chip Taylor, an insect ecologist at the University of Kansas who was not involved in the study.

Hmm... Growing up we had that much per 100 square feed in places. I used to love the milkweed plants as a kid. If the density has truly declined THAT much, then GM crops are not the cause. We used to also walk and hand spray beans back then. I think it means we have better herbicides (for now, the weeds are becoming increasingly resistant to RoundUp).

[taterjay]

Even something as old as 2,4-D is used to control milkweed. GMO has nothing to do with it in this case. Many herbicides control milkweed.