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[RC] Control of Tarweed from UC Davis - Sisu West RanchTarweed control from: http://cecalaveras.ucdavis.edu/tarweed.htm"...Mechanical: Mowing to 4 inches in May reduced tarweed by 20%, mowing in July reduced tarweed by 90%, whereas mowing in late August eliminated all but a few prostrate plants. Density in the year following late summer mowing was reduced by 90%. Chemical: University of California researchers, using 1.5 lb./acre of a low volatile ester of 2,4-D, found that tarweed was affected much more by the herbicide treatment before elongation (April 21) than after elongation (July 14). Because legal restrictions on herbicides are constantly changing, you should contact your Agricultural Commissioner before using any chemical control method. Seedbank: One of the major obstacles to mechanical or chemical removal of tarweed is the seedbank of hard ray achenes that exists on sites. After five years of summer mowing, tarweed densities were about 10% of those in unmowed plots. To be successful, the use of these methods must be long-term (over five years) to totally eliminate tarweed, otherwise the pasture will be reinfested once the eradication project ends...." This plant, which is much more prevalent than it was when settlers arrived, presents much of the same control problems as some of the exotic imported species we deal with. Note that whatever you do (I would use chemicals early in the year, but proper mowing apparently works well) you will have to plan on working hard for 5 years to eliminate most of the seeds. Welcome to the weed control club! Ed Ed & Wendy Hauser 2994 Mittower Road Victor, MT 59875 (406) 642-9640 ranch@xxxxxxxxxxx =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Ridecamp is a service of Endurance Net, http://www.endurance.net. Information, Policy, Disclaimer: http://www.endurance.net/Ridecamp Subscribe/Unsubscribe http://www.endurance.net/ridecamp/logon.asp Ride Long and Ride Safe!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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