Established Grasses for Seed Production 



(1) For control of most annual and many perennial broadleaved weeds 

 in grass-seed fields: Amine salt or ester of 2,4-D, 2,4,5-T, or MCPA 

 at 1/2 to 1 pound per acre applied as a spray after grasses are well 

 tillered, but before reaching the boot stage will control weeds without 

 significant injury to the grasses. Avoid spraying when grasses are in the 

 boot or early heading stages. Most grasses are tolerant to treatment; 

 however, bentgrasses and a few others have been reported as being more 

 sensitive. 



Established Pastures (including pastures with white, Ladino, and alsike 

 clovers in mixtures) 



(1) For control of most broadleaved weeds, such as ragweed, bitterweed, 

 tarweed, boneset, sneezeweed, pigweed, chicory, dandelion, curled dock, 

 burdock, Canada thistle, and others: Post- emergence application of an 

 amine salt or ester of 2,4-D at 1/2 to 1 pound per acre in late spring 

 after the period of initial rapid growth of legumes, but while weeds are 

 still small. Foliage applications of 2,4,5-T may be used for control of 

 some woody plants that are resistant to 2,4-D, but more injury to the 

 clovers and killing of lespedeza may be expected than with 2,4-D. 



(2) For control of wild garlic, wild onion, curled dock, and other semi- 

 tolerant pasture weeds in many areas: 2 applications of 2,4-D each year 

 for 2 or more years, are usually required. One application should be made 

 during the period, October to December, and the other during the period, 

 February to May. 



(3) For renovation of sod: Dalapon at 4 to 8 pounds per acre is effective 

 in killing many grasses in preparation for renovating pasture sod. Amitrol 15 

 alone, or in combination with dalapon, has been useful in the northeastern 

 United States. The herbicide treatments may be made in the fall or spring 

 to kill grasses and reduce the number of diskings necessary for seedbed 

 preparation. The dalapon residues decrease in warm, moist soils in 3 to 

 4 weeks and seedings can then be made. Amitrol disappears more rapidly 

 from the soil. 



Comments and precautions .- -Good pasture management practices, 

 including proper fertilization and efficient grazing management, are 

 necessary for successful control of weeds. When these practices have 

 been followed within the limits of practicality and weed infestations still 

 occur, 2,4-D and 2,4,5-T, or mixtures of these herbicides, may be used 

 effectively and safely for weed and woody plant control. Some injury 

 may occur to legumes, especially from the repeated treatments; how- 

 ever, the legumes may recover or may be re-established after satis- 

 factory control of the weeds. 



u Amitrol cannot be recommended (as of April 1, 1958) for renovation of sod since evidence has not been de- 

 veloped to prove it will leave no residue or/and tolerances have not been set under Public Law 518. 



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