124 STATE HORTICULTURAL SOCIETY. 



to strain. When partly mn in, test with ferro-eyanide of potashf to 

 make sure enough lime has been used. If Paris green, arsenate of lead, 

 or any other poison is to be used, make it into a thin paste with a little 

 water and add it to the bordeaux mixture, which is now ready to be 

 used. 



COPPER SULPHATE SOLUTION. 



Copper sulphate solution is copper-sulphate dissolved in water. It is 

 used by some growers to spray peach trees to prevent the leaf curl where 

 a spraying for scale insects is not required. Two pounds of copper sul- 

 phate to 50 gallons of water is strong enough for this purpose. 



POISONS USED IN SPRAYING. 



For Insects That Chew. 



ARSENATE OF LEAD. 



This poison is used very extensively. It can be secured for a reason- 

 able price, is ready to use at any time, does not easily injure the foliage 

 and is the only poison that can be safely used in the lime-sulphur sprays. 



Injury to tender foliage like the peach has occasionally occurred by 

 spraying with arsenate of lead and water when the foliage was moist 

 from dew or rain. If necessary to spray tender foliage (peaches or 

 Japanese plums) at such a time it would be well to add 3 to 5 pounds 

 of slaked lime to every ,50 gallons of the spraying material. 



Arsenate of lead is usually sold in kegs or ''kits" or small barrels in the 

 form of a paste. Some companies have it in a powdered form. This form 

 usually costs twice as much or more per pound as the paste form and 

 since it does not contain much water only one-half the amount in 

 weight should be used as is recommended for the paste form. 



A simple, easy way to work the thick i^asty arsenate of lead into a 

 thin, smooth paste (as it should be before using either alone or in some- 

 thing) is to put the amount required in a keg; add water and churn 

 with a dasher. This is much quicker. than to use a paddle. 



PARIS GREEN AND LIME. 



Always use lime with paris green, it makes the poison stick better, 

 besides greatly reducing the danger of burning the foliage. 



t Thl3 chemical can be secured of any druggist. Ten cents, wortli dissolved in a pint of water will 

 be enough for a season Drop a very little in the bordeaux, if a reddish brown color appears more 

 lime must be added. If there is no discoloration, there Is enough lime. Ferro-cyanide of potash 

 is extremely poisonous, so observe great care in Its use. 



