No. 3.] Some comparative Trials of Insecticide Pumps, etc. 113 



iv.— Some comparative trials of insecticide pumpsi 

 IN relation to the treatment of tea blights, 



AND experiments IN THE TREATMENT OF RED 

 DSPIER. 



By W. J. FLEET, f.h.a.s. 



Plates— Nos. IX and X. 



The following notes were derived from observation of the practi- 

 cal use of insecticide sprayers on various descriptions and forms of 

 tea-bushes on an extensive garden, and at more than one season of 

 the year. The machines were all of the knapsack form, and sup- 

 ported on the back by means of straps. Having been brought into 

 working order they were placed in the hands of coolies, whose work, 

 however, was under constant supervision. The pumps were utilised 

 in the application of various descriptions of insecticides and fungi- 

 cides, the active principle in some being in solution and in others in 

 a state of suspension. 



Powder Diffusers :— 



1. Strawson's •' Coronette. "* 



2. Vermorel's "Torpille. "^ 



Liquid Sprayers :— 



3. Vermorel s "Eclair."^ 



4. Strawson's "Notus. "^ 



5. „ " Improved Antipest. "2 



6. Chiswick Co/s Sprayer.* 



1. Strawson's ^^ Coronette.'* — A well-constructed diffuser for 

 sulphur and powdered preparations. The bellows are placed at base 

 of the machine in a protected position and are worked by a side 

 lever. The powder meets with the blast from the bellows after pass- 

 ing from the body of the knapsack through a fine grating on which 

 oscillates a brush. The density of the spray can be regulated by a 

 feed-slide. 



2. Vermokfl's " Torpilhy — This is very similar in principle to 

 the preceding and did equally good work. The bellows are placed 



1 Most of the pumps in use were supplied by the Trustees of the Indian Museum for the 

 purpose of experiment, 



* Obtainable fron) Messrs. Strawson & Co., 77, Queen Victoria Street, London, E.G. 

 3 Sold by Messrs. Charles Clark & Co., 20, Great Saint Helen's, London, E.C. 



* Can be procured throueh their Calcutta Agents, — 1 he Planters' Stores and Agency 

 Company, Limited, 3 Mission Row, Calcutta. 



