Diseases 237 



in a pit after the manner of charcoal fires." A 

 machine 10 ft. by 8 ft. costs in London about 

 ^85 ; smaller sizes costing ^55 for 8 by 5, and 

 ^40 for 6 by 4. The net weight of the largest 

 incinerator is 17^ cwt., of the 8 by 5, 9^ cwt., 

 and of the 6 by 4, 6 cwt. 



Once the estate is well watched, there should 

 be no need of a general clear out, for the whole 

 object is to mark the individual trees directly 

 they show signs of being affected, and not to 

 wait until two or three groups of perhaps half 

 a dozen each have to be condemned and de- 

 stroyed. Such cases do indeed cost time and 

 trouble, but if they arise, let the trees be seen to, 

 let it be done well, and done at once. Better 

 still, however, keep your eyes open, and do 

 not let such cases occur. One tree at a time 

 will be quite enough. In Trinidad, however, 

 Mr. Rorer tells us, a number of different 

 methods of control for the disease have been 

 suggested from time to time. Work done 

 tends to show, he goes on to say, that sanitary 

 methods help to check the disease to a great 

 extent, but to give the best results these 

 methods should be followed up by spraying. 



As Johnston has shown, the infection of 

 bud-rot generally takes place at the bases of 

 the leaves and spathes. If these parts of the 

 palms were covered with a good fungicide and 

 insecticide, infection could not take place. A 

 practice which accomplishes this end prevails to 

 a certain extent in some places, and is said to 



