272 STATE BOARD OF AGRICULTURE. 



PARIS GREEX. 



Paris Green 1 pound 



Water 100 to 200 'gallons 



For the destruction of insects that eat the foliage or fruit, Paris 

 green is a valuable remedy. It can be used in water in the above pro- 

 porations, the stronger mixture being used for potatoes, while for fruits 

 it is seldom advisable to use more than 1 pound in 200 gallons of water, 

 unless in connection with lime water or Bordeaux mixture. It is 

 always advisable to first form a paste with a small amount of water 

 when preparing it for spraying. For low plants Paris green may be 

 used in a powder form either alone or with one hundred times its weight 

 of plaster. London purple is sometimes used in place of Paris green, 

 but it ife more apt to injure the foliage. Green arsenoid ai^d arsenate 

 of lead are valuable substitutes for Paris green. 



WHITE ARSENIC. 



As Paris green is quite expensive and is sometimes adulterated, white 

 arsenic is frequently used in its place. • Its cost is about one-third that 

 of Paris green, and, as it is nearly twice as effective, the expense is only 

 one-sixth as much as when Paris green is used. To prepare arsenic for 

 use the following treatment is necessary : In two gallons of water 

 place two pounds of freshly slaked lime and one pound of arsenic; 

 after boiling thirty to forty minutes the arsenic will have dissolved and 

 united with the lime, so as to form an insoluble compound. When de- 

 sired for use the arsenic should be diluted, and one pound prepared as 

 above will suffice for two to three hundred gallons when used upon 

 fruit trees, or one hundred fifty gallons for spraying potatoes. That 

 there may be no injury to the foliage, it is desirable to use the arsenic 

 thus prepared either with Bordeaux mixture or lime water. When lime 

 water is used, one pound of lime will be sufficient for twenty gallons of 

 water. Although the spraying calendar does not refer to arsenic, it 

 can be substituted for Paris green if desired. 



LIME AND SULPHUR MIXTURE. 



(For the San Jose Scale.) 



Lime (unslaked) 15 to 25 pounds 



Flour of Sulphur • 15 pounds 



Water 15 gallons 



Boil one hour and diluted to fifty gallons. 



The best remedy that has been found for the San eJose scale is sul- 

 phur and lime prepared after the above formula. Where one has only 

 a few acres of orchard to spray a jacketed iron kettle will answer for 

 cooking the spray mixture. ^ Place ten or fifteen gallons of water in a 

 kettle and as soon as it boils add the lime. Fifteen pounds will answer 

 if unslaked but the amount should be increased if much of it has be- 



