I don't have much experience with American beers. I have heard of Lone Star though. (My brother used to work for a company out of Austin.) I must say, I do have experience with BC Glacier beers though. And they're amazing.
It got harder than a well done pork chop actually............. In that forestry picture site [ i cant recall site name] it says that the herbicides will do that to a leaf. It musta been small dose and from root as it is effecting only the crown.