blossoming. The first application should be followed by two or three 

 later ones at intervals of three to four weeks during the spring grow- 

 ing season, and one or two others in late summer or fall. The last 

 application should be made late enough in the summer or fall to 

 prevent the plants from recovering before the close of the growing 

 season. 



A suitable day for spraying is one on which there is little wind and 

 slight probability of rain for several hours. The sky may be either 

 cloudy or clear. A heavy dew the following night is advantageous. 

 Spraying should be discontinued during periods of drought in mid- 

 summer, when the grass is inactive and soil is very dry. Serious 

 injury to the grass may result from spraying at such times. As far 

 as possible, it should be arranged to spray two or three days after 

 mowing and to mow two or three days after spraying. 



STRENGTH AND QUANTITY OF SOLUTION, AND MANNER OF APPLICATION. 



The spray solution is prepared by dissolving one and one-half 

 or two pounds of iron sulfate (also called copperas and green vitriol) 

 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 



