1919.] CONTROL OF THE CACAO THBIPS. 95 



Provide two tubs of 25 gallons (American) each ; also have ready a 

 •cask or tank of 50 gallons (American) capacity. In tub No. 1 which 

 must be filled with strained water dissolve the five pounds of bluestone. 

 If the bluestone is wrapped in a piece of bagging and suspended just 

 below the surface of the water it will melt in a couple of hours without 

 any stirring. In tub No. 2 place five pounds of temper lime and slake 

 it by throwing water on it a little at a time until the lime ceases boiling ; 

 then fill the tub with strained water. These two solutions will keep 

 well when left in their tubs. To make Bordeaux mixture stir the 

 contents of Nos. 1 and 2 thoroughly just before the mixture is required 

 and pour the two solutions into the cask No. 3 as illustrated. When 

 properly made the Bordeaux mixture should be of a sky blue 

 colour, any other colour, green especially, appearing shows that there 

 is something wrong with the ingredients or make up. Bordeaux mixture 

 should be used on the same day it is made. 



The lime may be slaked in an iron or tin A'essel, but the bluestone 

 should never be dissolved in anything but a wooden or earthenware one. 

 For spraying or carrying from the mixing barrel to the spray tank iron 

 or tin buckets may be used. 



To make 5 American gallons of Bordeaux mixture take : — 

 Bluestone ... ... \ pound. 



Temper lime in lumps .. h pound. 



Water... ... ... 5 gallons or one pitch oil tin full. 



Dissolve the bluestone in a wooden or earthenware vessel in 2^ gallons 

 or half a pitch oil tin of water; slake the temper lime in 2\ gallons of 

 water and pour the two solutions together into a tub or pitch oil tin, 

 as detailed for making 50 gallons of mixture. 



Nicotine Sulphate or Black Leaf 40. 



Nicotine sulphate is a thick liquid of the consistency of molasses. 

 It should not be used with v/ater only as it does not spread enough on 

 cacao leaves. It should always be mixed with Bordeaux, soap, flour 

 paste or resin wash as detailed in the following formulte. The best 

 combinations are with Bordeaux and resin wash. 



Formula No. 1. — Nicotine and Bordeaux. — For spraying thrips add 

 to every 50 American gallons (or 40 imperial gallons) of Bordeaux 

 mixture 7 fluid ounces of nicotine sulphate. A quarter lb. capstan 

 tobacco tin makes a handy measure for use in the field as it contains 

 when filled to the top nearly 7 fluid ounces. 



To every 5 gallons or one pitch oil tin full of Bordeaux add 5 tea- 

 spoonfuls of nicotine. 



Add the nicotine to the Bordeaux mixture just before using. Stir 

 well. 



Formula No. 2. — Nicotine and Soap — 



Ordinary laundrj^ soap ... .., ... 2 pound?. 



Nicotine ... ... ... ... 7 fluid ounces. 



Water ... .., ... ...50 American galls. 



Dissolve the soap in the water then add the nicotine. 



