EXPERIMENT STATION BULLETINS. 273 



come air-slaked. The maximum amount given above will not be exces- 

 sive and as it will serve to whiten the trees and show the thorough- 

 ness of the sprajing, it is often advisable. Make a paste of the sulphur 

 and turn it into the kettle or sift it in slowly. The sulphur and lime 

 should be thoroughly stirred while the lime is slaking, and occasionally^ 

 until the boiling has been completed. By continuing the boiling for 

 fifty to sixty minutes the liquid will have changed to a reddish amber 

 color, when it will be ready for use. In order to have all the sulphur 

 dissolved, boiling for one hour will be safer than for a shorter period. 

 Cold water can be used for diluting if it is not convenient to use warm 

 water. While the mixture need not be boiling hot, it should be at least 

 warm enough to prevent crystalizing of the sulphur. 



If a large quantity is required, steam can be used for boiling the mix- 

 ture. This can be done either in barrels or in a tank holding 100 to 

 150 gallons. 



„ The best results will be obtained when the spraying is done in the 

 spring just before the buds open. Fairly good results can be secured 

 in the fall, but winter applications will be found less effectual. 



In addition to being the best remedy for the San Jose scale and other 

 insects, the sulphur and lime solution is an excellent fungicide. When 

 this has been used there will be no occasion for spraying with Bordeaux 

 mixture previous to the setting of the fruit. It will also destroy the 

 eggs of any insects upon the trees as well as any that are present in 

 the other stages of development. 



Con-Sol, Horicum, Salimene, and other preparations of lime and sul- 

 phur that are upon the market have not been found satisfactory. 



HELLEBORE. 



Fresh White Hellebore 1 ounce 



Water 5 gallons 



For insects that chew, and especially for the currant and cabbage 

 worms. 



PYRETHRUM OF BUHACH. 



Pure Fresh Pyrethrum 1 ounce 



Water 5 gallons 



Valuable against both chewing and sucking insects, especially upon 

 maturing fruits or vegetables, and upon flowering plants. It can also 

 be applied in a powder form with a bellows. 



CAUTIONS. 



The copper solution should be made in wood, glass or earthen vessels, 

 and should not be prepared in iron or tin. 



Care should be taken against spraying plants of any kind with lime 

 or poisonous mixtures within four or five weeks of the time they are 

 to be used as food. 

 35 



