26 
Colorado Experiment Station 
tner of 1918 the stock association and county cut off the milk- 
weed along ditch banks and driveways, and that, whereas the 
the annual loss in the valley for three years previous to this 
work had been between $20,000 and $30,000, during the winter 
of 1918-19 and the spring of 1919, no losses occurred in this area. 
This reduction was as much due to the publicity work which 
made stockmen acquainted with the plant as to the work done 
in cutting it off along the driveways. 
4. Another precaution is to absolutely refrain from feeding 
any hay containing milkweed. 
Fig-. 20 — A sign posted by the State to acquaint stock- 
man with whorled milkweed. 
There is no doubt that as long as milkweed is present in any 
considerable quantities, poisoning is likely to occur, so that if 
losses are to be absolutely stopped, eradication is the only solu- 
tion. 
ERADICATION 
Experimental Work in Montezuma Valley 
Experiments were carried on with a view to determining 
such methods as would fit into general farming practice. Work 
was begun in the Death Valley area 1 1-2 miles east of Cortez in 
June, 1918. The soil here is a heavy red clay loam three to four 
