WEEDS AND WOODY PLANTS ON RANGE LANDS 

 AND PERMANENT PASTURES 



Aerial or farm-sprayer applications (volumes of spray refer to aerial appli- 

 cations; treatments with farm sprayers may be made at higher volumes). 



A discussion of control of many range weeds is given in the handbook 

 "Chemical Control of Range Weeds," U. S. Department of Agriculture and 

 U. S. Department of Interior, Rev. 1959. 



(1) For control of sand sagebrush: Esters of 2,4-D at 1 pound in diesel 

 oil, or in an emulsion of 1 gallon of oil to 2 to 4 gallons of water per acre, 

 applied to the foliage in May or early June when plants are growing rapidly 

 and have made 6 to 8 inches of new growth. 



(2) For control of big sagebrush: Esters of 2,4-D at 1-1/2 to 2 pounds in 

 5 gallons of oil, water, or oil-water emulsions per acre applied after spring 

 growth begins and before soil moisture depletion in the upper 8 to 10 inches 

 of soil. 



(3) For control of rabbitbrush: Esters of 2,4-D at 3 pounds in 5 gallons 

 of oil, water, or oil-water emulsion per acre when new twig growth is 3 

 inches or longer and before soil moisture depletion in the upper 8 to 10 inches 

 of soil. 



(4) For control of mesquite: Esters of 2,4, 5-T at 1/3 to 1 / 2 pound in 

 oil or in an emulsion of 1 gallon of diesel oil to 3 gallons of water per acre 

 applied to foliage in the spring. Silvex also has shown promise for the control 

 of mesquite. In the arid Southwest, repeated annual treatments are necessary 

 at the highest rates for 2 or more years. 



(5) For control of shinnery oak: Three repeated annual applications of an 

 ester of 2, 4, 5-T or silvex at 1 2 to 1 pound in oil or in an emulsion of 1 

 gallon of diesel oil to 2 to 4 gallons of water per acre when the plants have 

 attained the full-leaf stage and only if they are actively growing. 



(6) For control of post oak, blackjack oak, and other associated woody 

 plants: Esters of 2, 4, 5-T or silvex at 2 pounds per acre in sufficient diesel 

 oil to make 1 gallon and combined with 4 gallons of water to form an emulsion. 

 Applications should be repeated for 2 or 3 consecutive years although appli- 

 cations in alternate years may be acceptable. A mixture of esters of 2,4-D and 

 2, 4, 5-T also nnay be used with 2, 4, 5-T making^up at least 1/3 of the mixture, 

 where use of 2,4-D would not be hazardous. These mixtures should be applied 

 at 3 pounds per acre. Mixing instructions are the sanne as for 2, 4, 5-T and 

 silvex. 



(7) For control of buckbrush: Repeated applications of an ester of 2,4-D at 

 1 to 2 pounds per acre in an emulsion of 1 gallon of diesel oil to 3 gallons of 

 water or in 4 gallons of diesel oil. Treatment must be made soon after full 

 foliage has been reached. 



(8) Loco, silvery lupine, two-grooved milk vetch, prince's plume, w^oody 

 aster, and w^aterhemlock: Esters of 2,4-D at 2 pounds per acre at the bud-to- 

 early bloom stage. Repeated annual applications may be necessary. 



(9) Tansy-ragwort: Esters of 2,4-D at 2 pounds per acre at the early-bolt- 

 ing stage. 



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