toxic effects of the calcium cyanamide have disappeared. After toxic effects 

 have disappeared, decomposition products of calcium cyanamide serve as 

 an excellent source of nitrogen and calcium. 



(2) For control of seeds, seedling plants, or plant parts, disease organ- 

 isms, nematodes, insects, and other organisms in the soil : Methyl bromide 

 as a soil sterilant at 1 pound per 100 square feet of seedbed, which should 

 be well prepared and moist. The fumigant is applied under a gastight cover, 

 such as large plastic sheets available for this purpose. The additional cost 

 of this treatment, in comparison with other chemical weed control meas- 

 ures, is offset at least in part by improved chances for successful lawn 

 establishment and in subsequent savings in time and effort on maintenance. 

 When soil temperature is above 65° F., at time of treatment, seeding may 

 follow after 24 hours. When temperatures are 50° to 65° F., the rate of 

 treatment and time between treatment and seeding should be approximately 

 doubled. Follow manufacturer's instructions. 



ESTABLISHED LAWNS AND TURF 



Broadleaved Weeds 



(1) For control of dandelion, buckhorn, other plantains, curled dock , 

 and many other relatively easy-to-kill broadleaved weeds : Amine salt 

 of 2,4-D at 1 pound per acre. Apply any time weeds are actively growing. 

 Fall treatments are preferred because during this season desirable 

 grasses invade more readily the space left by dead weeds. Lawn grasses 

 grow most rapidly during the fall and spring. NOTE: For treating home 

 lawns or small areas with hand equipment, use 1 ounce (2 tablespoons) 

 of 2,4-D amine (having 4 pounds per gallon of herbicide) in a gallon of 

 water, completely wetting the foliage; or follow directions on label of con- 

 tainer. 



(2) For control of wild onions, wild garlic, red sorrel, knotweed, and 

 other hard-to-kill broadleaved weeds : Repeated sprayings of a low- 

 volatile ester of 2,4-D or an amine salt of 2,4-D at 1 pound per acre, 

 plus a detergent to improve wetting of the plants with the spray; or fol- 

 low directions on label of container, using highest recommended rate. 

 To control wild garlic and wild onion, spray in late fall and again in late 

 winter or early spring each year; to control such weeds as red sorrel and 

 knotweed, spray annually in the spring. Knotweed should be sprayed soon 

 after emergence. 



(3) For control of white clover and many other weeds : Silvex or 2,4,5-T 

 at 1 to 1-1/2 pounds per acre. Follow directions for mixing on label of 

 container. 



(4) For control of chickweed and henbit and other hard-to-kill winter 

 annual~weeds : DNBP at 3/4 to 1-1/2 pounds per acre or 2 ounces (4 table- 

 spoons) in 1 gallon of water per 1,000 square feet. Apply in fall when plants 

 are young and when air temperature is 65° F., or above. Injury to grass 

 foliage is only temporary. Other herbicides used for control of chickweed 

 are: (a) Silvex, which gives satisfactory control; (b) 2,4-D, which usually 

 will give good control when applied in repeated sprayings, although com- 

 plete elimination is not always accomplished; (c) KOCN; and (d) sodiam 

 arsenite. Sodium arsenite is extremely poisonous, and should be applied 

 only by experienced spray applicators. 



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