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. 



Limb-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 Jose 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. 



1 Modified from Scott, W. M., U. S. Dept. Agr. Bur. Plant Indus. 

 Circ. 27. 



