Important Obchabd Pests and Spra? Formulae. 487 



mcnt of Agriculture, has used since 1007 Lime-sulphur mixtures 

 which have proved safe and have controlled peach spot and the 

 brown rot when thoroughly and carefully applied. Very small 

 amounts of the lime and sulphur actually combine, as happens in 

 the boiled wash; hence the Beaume hydrometer has no place 

 in preparing the Scott mixture 



To prepare 50 gallons of this spray material, place in a barrel 8 

 pounds of fresh stone lime with water to cover the lime and, when 

 slaking begins, add 8 pounds of sifted or pasted sulphur. Stir 

 the mixture, while slaking continues, for 5 minutes, adding small 

 amounts of water to keep the mixture free. At the end of 5 

 minutes add enough cold water to make 50 gallons and also cool 

 the mixture to prevent the further formation of lime sulphids. 

 Some slow slaking lime may require longer than a 5-minute 

 interval, but the above is sufficient with a brisk, active lime. 

 Strain out the lumps of lime. Lumps of sulphur should be 

 worked through the sieve. If curculio is troublesome, 2 pounds 

 of arsenate of lead should, be added to each 50 gallons of the above 

 spray. 



BORDEAUX MIXTURE 



Bordeaux has been a standard fungicide for twenty years. For 

 control of grape rot it is still the standard spray. It consists of 

 5 pounds of copper sulphate, 5 pounds of stone lime, and 50 gal- 

 lons of water. The copper sulphate should be dissolved in half the 

 quantity of water, while the lime is slaked, and then diluted with 

 the other half. Pouring these dilute solutions together gives a 

 much finer grained mixture than if the solutions are combined 

 while in concentrated form. For apple and pear spraying the 

 formula is often reduced to but 3 pounds each of lime and copper 

 sulphate, to each 50 gallons of spray. Bordeaux should not be 

 used on peach foliage. 



GENERAL PLAN FOR APPLE SPRAYING* 



1. Dormant season, before leaf buds open but just as they are 

 swelling, 

 (a) Lime sulphur as a contact spray. 



For San Jose scale 32° to 33° Beaume, 1-8. 

 For blister mite 32° to 33° Beaume, 1-11. 



From Cornell University Agricultural Experiment Station Bulletin 283. 



