672 



ADDITIONAL EXERCISES 



"Dflute this stock resin solution with 8 parts of water before adding to the 

 Bordeaux mbcture, that is in preparing a so-gallon barrel of the mixture, the copper 

 sulphate and lime are diluted enough to make 40 gallons after which 2 gallons of 

 stock resin solution are diluted to 10 gallons, then added to the Bordeaux." 



This solution exceeds ordinary Bordeaux in adhesive properties and has been 

 highly recommended for asparagus rust. 



Method of Malting SmaU Quantities of Bordeaux Mixture.— Two half-barrel tubs 

 are made by sawing a barrel through the middle. One tub is used for the blue-stone 

 solution and the other for the milk of lime, and each tub should contain 23 gallons. 

 One man dips the blue-stone solution with a bucket and pours it into a barrel and 

 another man simultaneously dips up and pours in bucketfuls of the milk of lime. 



Fine ocsh scran 

 onlfuinel to atnun 

 Bordcoax 



U^tbe mixture at once m^proipr-*' Sproyer 



Fig. 237. — Diagram showing easy method of making small quantities of Bor- 

 deaux mixture. (After Coons, G. H., and Levin. Ezra, Spec. Bull. 77, Mich. Agric. 

 Coll. Exper. Slat., March. 1916.) 



The lime solution should be kept \Tell stirred. If only a single barrel is to be made, 

 the materials may be dissolved in the dilution tubs, but if a number of lots are re- 

 quired the materials can be kept in stock solutions and simply transferred by dipping. 

 No matter what quantity of mixture is to be made up, it is necessary to strain the 

 materials through a wire strainer. The best type is made of brass wire with 18 to 

 20 meshes to the inch (Fig. 237). For details see Waite, M. B.: Fungicides. 

 U. S. Fanners' Bull. 243 (1906). 



In large operations stock solutions should always be used, as the time required to 

 dissolve the material is saved. These can be prepared of both copper sulphate and 

 the lime. Dissolve copper sulphate in water at the rate of i pound per gallon and 

 lime in the same ratio. Then measure off the required quantity of each and dilute 

 with water before mixing. If possible the dilution tanks should be raised so high 

 on an elevated platform that the mixture can be conducted by gravity into the 

 spray tank on wheels or in a wagon beneath. An available water supply is necessary. 



