St. Johns wort poisoning in tx

[colleen]

What is the best way to kill flowering St. johns wort in pasture where cattle are grazing. We cannot move the cattle to another pasture. It is not in the whole pasture only in about 1/3. Thanks
Colleen

 

[dun]

Grazon, 2,4-d, glyphosate, should kill it.

 

[colleen]

Thanks!

 

[colleen]

Quick update....Not St. Johns wort. It is buttercup. Tiny yellow flowers. St. johns wort sort of resembles buttercup. Buttercup causes photosensitivity but happens because of a damaged liver. The by products of the plants arnt digested properly and accumulate in the skin instead of being cleared by the liver. St. Johns wort causes photosensitivity directly to the skin. Here is a link... http://beefmagazine.com/mag/beef_photosensitivity/