6 



in each gallon of water. The weaker solution appears to be entirely 

 satisfactory, and is probably the one to be preferred. Used at 

 this strength, the quantity of iron sulfate required for a single applica- 

 tion is approximately 175 pounds per acre, or four pounds per thousand 

 square feet of lawn. A gallon of the solution will cover about 375 

 square feet. Iron sulfate for spraying purposes is usually offered 

 for sale in the granular or " sugar " form, which is readily soluble 

 in water. It is comparatively inexpensive, costing, usually, from one 

 to two dollars per bag of one hundred pounds. Since it corrodes 

 metals, the solution should be prepared in wooden or earthenware 

 vessels. 



Experience has demonstrated rather conclusively that the effect- 

 iveness of the spray solution upon the dandelions depends, to a 

 considerable extent, upon the manner in which it is applied. The 

 best results are secured when the solution is applied in the form of 

 a fine, mist-like spray well driven down among the foliage. While 

 fairly satisfactory results may be expected when the solution is applied 

 judiciously with a sprinkling can, it is recommended that some 

 form of a spray pump be used. The kind of outfit selected should 

 depend upon the size of the area to be treated. For small lawns 

 a compressed-air sprayer, knapsack sprayer, or good bucket pump 

 with brass cylinder, and equipped with a fine nozzle will be found 

 satisfactory; while for large lawns a sprayer mounted on wheels 

 is desirable. For very large areas (parks, roadsides, etc.) a power- 

 driven field or orchard sprayer will be found most practical. A 

 lead of hose at least 80 to 100 feet long should be used on the power 

 outfits. In any case, . the nozzle should be capable of delivering 

 a fine mist-like spray which will drift evenly over the foliage, 

 and the area should be sprayed evenly, avoiding the drenching of 

 any particular part. One of the new type spray-guns attached 

 to a power sprayer will be found to facilitate the work very materially 

 when it is desired to cover a large area quickly and evenly. 



The spray solution should be strained thru a fine strainer or two 

 thicknesses of cheesecloth to remove any particles which would 

 clog the nozzles. 



CAUTION. 



On stone, cement, metals, and cloth, iron sulfate solution produces 

 a conspicuous yellowish-brown rusty stain which is extremely difficult 



