Re: [RC] [RC] Roundup Weed Control in the Pasture - Ed & Wendy Hauser
"...knapweed
spread..."
Knapweed, of which there are 3 varieties, is in the
thistle family. They came over from Asia about 1900. In some areas
of the west they can take over most non-irrigated areas very quickly. The
spotted knapweed is the most prevalent here in the bitterroot. They are
spread by seeds. They live 4-5 years. Seeds are viable in the soil for up
to 6 years. They secrete a natural herbal substance (otherwise known
as a chemical) that stops other plants from growing near them.
Mowing does no good. Chemical control works
well. If the area is suitable picloram (Tordon 22K) will control for 3 or
more years. Other shorter acting chemicals work also and are best in areas
near water. Pulling works, if you only have a few plants. There are a
weevil and some flies that control it. The U of Montana Ag. station at
Corvallis is mass producing the bugs.
Ed
Ed & Wendy Hauser 2994 Mittower
Road Victor, MT 59875
