APPENDIX. 271 



POTASSIUM SULPHID. 



Potassium sulphid 1 ounce 



Water 3 gallons 



Dissolve the potassium sulphid in the required amount of water 

 and use immediately. This mixture is effective for surface 

 mildews. 



CORROSIVE SUBLIMATE. 



Corrosive sublimate 1 part 



Water __ _ 1000 parts 



This solution is used to disinfect tools used in cutting out pear 

 blight. 



PARIS GREEN. 



For general purposes : 



Paris green 1 pound 



Water . 50 to 100 gallons 



For pome fruits and grapes : 



Paris green 1 pound 



Water 150 to 200 gallons 



Milk of lime from slaking three pounds of lime for each 50 

 gallons of spray should be added. 



Paris green may be added to bordeaux mixture. In that case 

 no lime will need to be added, as the bordeaux mixture contains 

 lime. 



ARSENATE OF LEAD. 



Arsenate of lead may be applied at the rate of 2, 3, or 4 pounds 

 for every 50 gallons of water or bordeaux mixture. It is ad- 

 visable to add lime water when the arsenate of lead is used with 

 water. 



SCHEELE'S GREEN. 

 Scheele's green is used the same as Paris green. 



HELLEBORE. 



Hellebore may be applied dry, diluted with from 5 to 10 parts 

 of flour, or with water at the rate of one ounce to the gallon. 



Hellebore acts as an internal poison to insects, but is harmless 

 to man in the quantities recommended. 



WHALE-OIL SOAP WASH. 



For aphides and pear psylla : Dissolve 1 pound of soap in 3 or 

 4 gallons of water. 



For scale insects: Dissolve 2 gallons of soap in 1 gallon of 

 water, and apply when the trees are dormant. 



