I've often been told that if you are going to use a chemical
herbicide, round-up is actually the best choice environmentally, and
considered the least toxic. According to the agricultural chemical
handbook, it breaks down within three days. It doesn't take two
weeks to get into the plant, but it does take two weeks for the
physiological effects to show up. (I'm quoting second hand, but I can
get the exact reference if you want) Also, you should be aware that
organic applications can be even more detrimental to the environment
than inorganic ones.

My husband works for the USDA on wheat research. They are trying to
come up with farming methods that are friendlier to the environment
(no tilling, no pesticides, higher yield per acre so less needs
to be planted, etc.) Of course, this person wants to plant alfalfa,
but I'm sure the USDA is doing research on that somewhere. You might
encourage your neighbor to contact them and see if there are any
developments in alfalfa farming and "noxious weed" control. I know
many farmers don't like to change, 'cause they're doing things the
way they've always been done. Remind him, nicely of course, that
this is, well, close-minded, short-sighted, and uneducated (sorry,
I'm spouting!). I bet he's not still using horses or oxen to till
and plant either.

Sorry I don't have any specific alternatives for you, but good luck
saving some thistles. Perhaps, if nothing else, he could be
convinced to leave a border of native plants between his fields and
your (and other neighbors) property.
jw


Jane Westervelt
Steve Kalloger
Moscow, ID