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(Continued from page 292) 



go through the sprayer as well as the sulphate o" f 

 iron solution when sprayed separately. The \ 

 applications which we made on sunny days were I 

 more effective than those made on cloudy days, i 



THE TIME OF YEAR 



In our previous experiments we did not at- 

 tempt to kill the Poison Ivy until late in the I 

 season, but for this latest test operations were 

 started at an early date, and we performed 

 our first spraying as soon as the leaves were 

 well developed. Our first application of spray 

 mixture did not kill the plants but blistered 

 the leaves, and the second application killed 

 the leaves. This was early enough so that a new 

 set of leaves was put out by the plant, and as 

 soon as they were large enough to spray, we gave 

 them another application, and repeated it where 

 the leaves had not withered after a week. This 

 kept the plants devoid of leaves, and it was evi- 

 dent that it had weakened the plants so that they 

 did not start the following season in the same 

 manner as they would if allowed to run their 

 natural course. In some places we had killed the 

 plants entirely, while in others, where we could 

 not reach all of the plants, they started again, 

 but not as vigorously. 



I am of the opinion that methods of this 

 nature would be of advantage in destroying 

 Poison Ivy where it abounds in large quan- 

 tities, because the leaves are the parts of the 

 plants where raw food is digested and sent 

 back to the stem and roots for use in the fol- 

 lowing season. If they are not present it 

 will either check the growth or kill the plant. 

 Our work the first season checked the growth, 

 and by repeating the work the second season 

 it killed the plants. • 



HANDLING THE SPRAY MATERIAL 



The spray mixture is very inexpensive, as 

 the sulphate of iron only costs a few cents a 

 pound. As it is much heavier than water it 

 must be suspended in a bag in order to make it 

 dissolve quickly. This chemical will corrode 

 iron vessels, and should be prepared in a 

 wooden barrel or pail. A gallon of water 

 will dissolve about two pounds of iron sul- 

 phate, and it is used at this strength; weaker 

 applications have not been satisfactory. After 

 it is ready to use, the spray oil should be added 

 at the rate of one ounce (liquid measure) to a 

 gallon of water, and applied as soon as thor- 

 oughly mixed. 



In spraying it is not advisable to use a ma- 

 chine having an iron tank; the brass tanks do 

 not corrode, and are more economical in the 

 end. Applications made with sprinkling pots 

 or watering cans are very wasteful of the ma- 

 terial, while by using a sprayer about three 

 times the area may be covered. 



The above mentioned spraying mixture is 

 satisfactory for saturating stone walls, spray- 

 ing Poison Ivy along fences which are not 

 painted, or applying it where the Ivy grows 

 among weeds or brush along the roadsides. 

 I do not advise using it among valuable shrub- 

 bery, but if necessary would give it a trial on 

 a few leaves of the shrubs before performing 

 spraying on a large scale. Where vines climb 

 into trees we cut the vines close to the ground, 

 and as soon as the roots put out shoots they are 

 sprayed in the same manner as among the 

 fences. 



We have been quite pleased with the re- 

 sults from our spraying work against this dis- 

 agreeable weed, and our experience might be the 

 means of someone else trying it out in a small 

 way and perhaps obtaining good results. 



Garrett M. Stack, Connecticut. 



294 



