"Gas powered weed eater. Knock the grass and weeds down around the hives 4 or 5 times during the year."
as i said earlier, i have used roundup as well. my problem is two fold, living in the country, we get all sorts of funky weeds that grow in front of my hives, and they come back at some point, and also the lowest line on my electric fence is 6" to 8" off the ground. i need to keep the weeds off the fencing, so as a matter of habit, the weeds get whacked down every week, and roundup treatments in the spring and fall.