June to the foliage when plants are growing rapidly and have made 6 to 8 inches of new 

 growth. 



(2) For control of big sagebrush: Ester of 2,4-D at 1 to 2 pounds in 50 gallons, per 

 acre, of oil, water, or oil-water emulsions when bunch grasses are heading. 



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

 emulsion of 1 gallon of diesel oil to 3 gallons of water per acre applied to foliage. 

 2-(2, 4, 5-TP) has also shown promise for the control of mesquite. 



(4) For control of shinnery oak: Repeated applications of an ester of 2,4-D at 1 

 pound in oil or in an emulsion of 1 gallon of diesel oil to 2 to 4 gallons of water per 

 acre applied to foliage. 



(5) For control of post oak, blackjack oak, and other associated woody plants: Ester 

 of 2,4,5-T or 2-(2,4,5-TP) at 2 pounds in an emulsion of 1 gallon of diesel oil to 4 

 gallons of water or in 5 gallons of diesel oil per acre. Application should be repeated 

 for 2 to 3 consecutive years using 1 to 2 pounds of either chemical. If a mixture of 

 2,4-D and 2,4,5-T is used, the first application should be made with 3 pounds and 

 succeeding treatments with 2 pounds in an emulsion of 1 gallon of diesel oil to 4 

 gallons of water or in 5 gallons of diesel oil per acre. 



(6) For control of buckbrush: Repeated applications of an ester of 2,4-D at 1 to 2 

 pounds In an emulsion of 1 gallon of diesel oil to 3 gallons of water or in 4 gallons of 

 diesel oil per acre. 



Single applications of foliage sprays with aerial equipment will often control 

 mesquite, sand sage, and big sagebrush. Repeated treatments, however, are frequently 

 needed. For satisfactory control of mixed stands of oak species and buckbrush, re- 

 peated applications for 2 or more consecutive years are nornaally required. 



Ground Equipment Applications 



(1) Foliage sprays applied with ground equipment may also be used to control the 

 above species. Depending upon the tolerance of the particular species 2,4-D, 2,4,5-T, 

 or 2 -(2,4,5 -TP) should be applied at 3 pounds per 100 gallons of water per acre. The 

 best time to apply foliage sprays on most woody plants is at the full leaf stage and 

 during the 3- to 4-week period thereafter, providing conditions are favorable for 

 active growth prior to time of application. 



(2) For effective control of mixed brush: Ammonium sulfamate at 3/4 pound to 1 

 gallon of water applied to foliage as a wetting spray. 



(3) For control of large brush and trees: 2,4-D, 2,4,5-T, or 2-(2,4,5-TP) applied to 

 basal bark, stump, or cut surface. (Treatments more fully described in Sec. VII, 

 page 26.) 



Comments and precautions . --In attempting to control weeds and woody plants 

 growing in association with desirable forage grasses and legumes, it should be 

 remembered that the margin of selectivity is often quite narrow. The difference 

 between weed and brush control and no injury to forage species or severe injury to 

 forage crops may often depend on a number of conditions that are subject to the 

 fluctuations of environment In localized areas. 



An attempt should always be made to apply the herbicide when the weeds are most 

 susceptible and when the desirable species are leastllkely to be Injured. These times 

 of application are not always compatible. Frequently, desirable species are 

 susceptible at the same time weeds are most susceptible. In these Instances, the 



- 22 - 



