36 DISEASES OF ECONOMIC PLANTS 



Bring the soda and a little water to a boil in a kettle, 

 then slowly add the sulphur and soap and boil for about 

 one hour, with frequent stirring ; strain and dilute to 

 100 gallons. 



Lime-Sulphur Mixtures ' 



These mixtures are of both fungicidal and insecticidal 

 value. 



Home-boiled lime-sulphur wash. — This is the wash 

 regularly used against the San Jos6 scale. 



Lime . . . 20 pounds 



Sulphur 15 pounds 



Water 50 gallons 



The lime, the sulphur, and about half of the water are 

 boiled together for forty-five minutes in a kettle over a fire 

 or in a barrel or other suitable tank with steam. Strain 

 and dilute to 50 gallons and the wash is ready for applica- 

 tion. 



For spraying trees in the dormant state this wash may 

 be substituted for Bordeaux mixture as a fungicide ; but 

 it is injurious to foliage, and cannot be safely used as a 

 summer spray unless greatly diluted. 



Factory-boiled or commercial lime-sulphur wash. — 

 This solution is practically the same as the home-boiled 

 wash and is placed on the market as a substitute for the 

 latter. The home-boiled wash is troublesome to make 

 and does not keep well. The prepared wash keeps in- 

 definitely and is ready for use when received, requiring 

 only dilution with water. 



' Modified from Soott, W. M., U. S. Dept. Agr. Bur. Plant Indus. 

 Circ. 27. 



