XIII, A. 5 Reinking: Philippine Economic^Plant Diseases 261 



In this preparation four times the usual formula is used, be- 

 cause it has been found that these quantities give more satisfac- 

 tion and convenient conditions for cooking than when smaller or 

 greater amounts are used. When smaller amounts are desired, 

 fractions of this formula may be used. 



APPARATUS 



One strong 190-liter barrel. 



One strong paddle, about 2 meters long. 



One sifter (flour sifter). 



Two or more buckets. 



One pair hand scales. 



One strainer, of cloth. 



PREPARATION 



1. Weigh out 14.4 kilograms each of lime and sulphur, having first sifted 



the sulphur. 



2. Place lime in barrel and add about 15 liters of water. 



3. Add sulphur as soon as the lime begins to slake vigorously. 



4. Stir preparation vigorously with the paddle, adding enough water from 



time to time to avoid "burning," and still not enough to "drown" the 

 lime. 



5. Add at least 95 liters of cold water with vigorous stirring as soon as 



the lumps of lime are thoroughly slaked. It is very necessary to cool 

 the preparation at this time by adding the water as indicated. 



6. Make up to 760 liters in spray tank, or dilute fractions of the stock 



solution correspondingly. 



7. Strain before putting into spray tank by running the solution through 



a cloth strainer. Work through any lumps of sulphur with a small 

 paddle. 



8. Apply the spray with any good pressure spray pump. 



FORMALIN SPRAY 



This spray is only used for special purposes, such as spraying 

 badly diseased citrus trees in order to defoliate them of all leaves 

 attacked by citrus canker and to help kill sucking insects. 



PREPARATION 



A solution of formalin should be prepared that contains be- 

 tween 0.4 and 0.5 per cent of formaldehyde. 



This percentage of formalin may be used in combination with 

 the standard Bordeaux mixture, using the latter mixture as a 

 diluting agent. 



FORMALIN 



A diluted solution of formalin is used for disinfection of seeds, 

 vegetative reproductive parts, and soil. 



Materials. Nonpoisonous to animals. 



Formaldehyde (40 per cent), also called formalin, liter 0.5 



Water, liters 150 



