SPRAYING FRUIT TREES. 345 



machines are, of course, in use. The best knapsack 

 machines are those in which the spray is forced out by 

 compressed air, the machine being charged with air 

 before spraying starts. The operator then 'has nothing 

 to do but to direct the spray when he gets amongst the 

 trees, having no pumping to occupy his attention. For 

 tall trees the nozzle has to be mounted on a long lance. 



Addenda. 



American Blight. In dealing with this pest on p. 268 

 only a brief reference was made to its also infecting the 

 roots. It appears that the lice migrate from the branches 

 to the roots, and cause galls to form thereon. It has also 

 been proved that the lice migrate from the roots to the 

 branches. It is impossible, therefore, to get wholly rid 

 of the aphis if the branch or aerial form only is dealt with, 

 hence it is essential to also apply remedies to destroy the 

 root progeny. This may be accomplished in two ways. 

 Thus, carbon disulphide, a highly volatile substance, 

 should be injected into the soil by means of a Vermoral 

 Injector in about four places, at a distance of 2ft. from 

 the trunk in winter. The operator must not smoke whilst 

 injecting the fluid as the disulphide is inflammiable. The 

 second method, which is less dangerous and more simple 

 to use, is to place some lumps of freshly burnt lime in a 

 ring around the base of the trunk. When these have 

 slaked, spread out the lime 2in. deep and ift. wide closely 

 around the trunk, and then cover it with a layer of soil. 

 The lime prevents the lice ascending or descending, and 

 as they cannot multiply on the roots, only above ground, 

 those below will eventually die. 



Another good remedy for eradicating American Blight 

 on the branches is to dissolve 402. of soft soap in a gallon 

 of boiling soft water, then add one fluid ounce of carbolic 

 acid and thoroughly mix the whole. Apply this when cold 

 by means of a stiff painter's brush to the infested parts 

 only. Use gloves to protect the hands from the acid. 



