246 STOCK-POISONING PLANTS AND THEIR CONTROL 



In addition to proper salting, the animals should have ample 

 water at all times. Without sufficient water, poisonous sub- 

 stances cannot be readily eliminated. 



Eradicating Poisonous Plants. — Various methods of eradi- 



FiG. 77. — YOUNG cow POISONED IN THE SPRUCE-FIR TYPE AT AN ELEVATION 



OF 10,000 FEET. 

 The predominating vegetation in the background is tall larkspur. The position of the animal, with 



the head down the slope, is characteristic of larkspur poisoning. Horses and sheep graze with 



impunity on the range here shown. 



eating plants from the range have been tried. Since all poison- 

 ous plants are not injurious to all classes of stock, the toxic 

 species may be weakened or thinned out by close cropping by 

 those animals that are not susceptible to injury. Thus larkspur 

 areas may with impunity be closely grazed by sheep. Complete 

 eradication of larkspur by the grazing of sheep cannot be ex- 

 pected, however, for native larkspurs are perennials and are not 



