260 The Philippine Journal of Science ma 



LIME-SULPHUR SPRAY 



In spraying operations it is often highly desirable to employ 

 a spray that will control sucking insects and fungi at the same 

 time. The lime-sulphur spray should be used under these cir- 

 cumstances. Very tender foliaged plants will not withstand 

 this highly concentrated spray mixture. 



Materials. 



Stone lime, kilos 16.2 



Flowers of sulphur, kilos 36 



Water to make, liters 190 



APPARATUS 



An open kettle large enough to hold 190 liters. 



A strong paddle. 



A pair of hand scales. 



A cloth strainer. 



PREPARATION 



1. Slake the lime in a convenient amount of water, adding the sifted sul- 



phur and stirring vigorously during the process. 



2. Make up to 190 liters with water. 



3. Boil for one hour, adding water as necessary to prevent evaporation 



below 190 liters. 



4. Stir from time to time. 



5. Strain off the clear liquid into a spray tank, dilute and spray in the 



usual manner as discussed under Bordeaux mixture. 



6. Storage. Concentrated lime-sulphur solutions keep well when stored in 



tight, filled, stoppered barrels, at the ordinary temperature. 



The solution prepared in this manner is reddish brown and 

 is too concentrated for direct application. It must be diluted 

 with water at the rate of 1 liter of the concentrate to from 10 

 to 20 liters of water, according to the strength of the solution. 

 For most accurate dilutions it is best to consult dilution tables 

 after determining the specific gravity of the concentrate. 



A commercially prepared lime-sulphur solution may be ob- 

 tained on the market. This solution should be used as directed. 

 It is much more expensive than the home-boiled preparation. 



SELF-BOILED LIME^-SULPHUR SPRAY 



Some tender-foliaged plants cannot withstand the toxic effects 

 of the copper sprays or the concentrated lime-sulphur spray. 

 For these cases the self-boiled lime-sulphur spray will have 

 to be employed. 



Materials. 



Stone lime, kilos 14.4 



Flowers of sulphur, kilos 14.4 



Water to make, liters 760 



