114 



be advisable to give here the formula and method of preparation. 

 Into an earthenware vessel ' ten pounds of fresh quicklime are placed, 

 and three or four gallons of hot water added. The lime is allowed to 

 slake for a short time and eight pounds of sulphur are added. 

 The heat of slaking of the lime should be sufficient to boil the 

 mixture if the lime is fresh. The mixture is stirred and allowed to 

 change to a yellowish brown colour, when it is made up with cold 

 water to 50 gallons. The mixture is then strained through a sieve or 

 piece of fine sacking, care being taken to work through the meshes 

 any sulphur which remains over. The mixture is now ready for use 

 <ind is applied by means of a spray. 



The above is the method of preparation of what is known as the 

 self-boiled lime-sulphur mixture. Owing to the difficulty in obtain- 

 ing good quicklime in this country it will scarcely be possible to 

 prepare the self-boiled mixture. It will, therefore, be necessary to 

 make the mixture up to 50 gallons using a zinc-lined*"'' vessel and to 

 boil it for half an hour over an open fire, v;hen the necessary chemical 

 reaction between the lime and sulphur will take place. 



The best sprayer for ordinary use in this country is the 

 '''Vermorel Eclair." These are stocked by the Borneo Company, 

 Ltd., Singapore, and by P>Iessrs, A. C. Harper & Co., Kuala Lumpur, 

 Klang, etc. The price of each is about $25. An *'Eclair" sprayer 

 can reach a height of ten feet, so that it can be readily used in young 

 Rubber, Coffee, Camphor, etc. For the purpose of spraying older trees 

 a more powerful machine is required. The " Eclair No. 3," fitted 

 with accessories, can reach a height of twenty feet. But it is advi- 

 sable to have a more powerful sprayer and, for this purpose, a 

 vermorel "Cascade" sprayer has been ordered by the Department of 

 Agriculture, and arrangements are being made to have it stocked in 

 this countr}^ It reaches a vertical height of forty-five feet. The 

 reservoir of "Vermorel" Spraying machines is usually made of 

 copper, but for use with reagents which react chemically with copper, 

 such as the lime-sulphur mixture above, tin-lined reservoirs are 

 supplied. 



From what is known of the fungus at the present time it is very 

 improbable that the spread of the disease by spores occurs at all 

 readily. The propagation of the fungus by means of the white 

 mycelium alone requires consideration. For this reason the distance 

 from which infection can spread by wind-blown mycelium is neces- 

 sarily small. In view of this one might anticipate that only areas 

 which are within a comparatively short distance of jungle are liable 

 to be infected primarily. Repeated outbreaks of the disease in areas 

 adjacent to the jungle will, therefore, necessitate the felling and 

 burning of a portion of the adjacent jungle. 



*A Shanghai jar serves the purpose well. 

 * ~ An old latex cart will do. 



