No. 3.3 Some Comparative Trials of Insecticide Pumps, etc. 115 



Insecticide No 



I. 



» 



2. 



>j 



3- 



» 



4- 



I) 



5. 



» 



6. 



a 



7' 



until a considerable area of garden was attacked, to allow of the 

 selection of a series of plots of an even character. 



An extent of old tea, heavily pruned some six years previously, 

 was selected for the uniformity of the attack. 



In addition to the marking out of the plots, numerous individual 

 bushes in each plot were numbered and memoranda made of the 

 condition of each. The garden immediately surrounding the plots 

 was sprayed with soft soap and sulphur to prevent, as far as possible, 

 the spread of Red Spider from the surrounding area to that of the 

 plots. 



Sulphur. 



Strawson's " Tea Velos." 



Soft Soap and Sulphur. 



Kerosene Emulsion. 



Chiswick Compound. 



Strawson's " M '' Insecticide. 



The special preparations in the above list were applied according 

 to the directions supplied by the makers. These latter being also 

 the manufacturers of sprayers, their machines were made use of, as 

 far as possible, in the application of each insecticide. 



Nos, I and 2. " Tea Velos " is a fine powder and both it and the 

 sulphur were applied by means of diffusers in the early morning 

 when the dew was on the foliage and so admitted of the adherence 

 of the dressing. 



No. 3 — was prepared as follows :— 



* Sulphur .,,.... 2 lbs. 



* Soft Soap , , , • , . 2 „ 

 Water , , , , , . .3 gals. 



The sulphur and soft soap were gradually added to each other 

 in a metal bowl, being worked the while by a strong iron spoon, 

 until they were rubbed down to an even paste. This was then mixed 

 with boiling water till the soap had dissolved. For application, 

 dilute with 10 times the quantity of water, having first stirred the 

 compound to cause the necessary suspension of the sulphur in the 

 liquid. 



No. 4 — was made according to a standard formula : — 

 Kerosene ..,,,,, 2 gals. 

 Soft soap . . , , ^ . , I quart. 



Water • . i gal. 



Sulphur g. s. 



* The sulphur was procured direct from Italy ; the soft soap obtained from the North- West 

 Soap Company, Calcutta. 



