400 



Notes 



Treatment. This is not readily killed by insecticides at the usual 

 strengths; but, fortunately, on account of its always being located 

 on the pods, insecticides can be used at greater strengths than they 

 could be applied to the foliage in this country, where the trees are 

 never dormant and where for some reason, probably altitude, oils 

 applied at the usual strengths are most apt to "burn" the foliage. 



I have experimented with a large number of contact poisons with 

 the result that I favour the use of whale oil soap and soft soap-kerosene 

 emulsion. The results of some of the experiments are tabulated below. 



Spraying Experiments against the Cacao Scale, St. diniorphns Newst. 



First examination Second examination Third examination 



Experiment 1 was sprayed with whale oil soap, 1 lb. to 4 gallons 

 of water. 



Experiment 2. The formula of the stock solution of kerosene 

 emulsion was: 



Kerosene . . . . . . , . . . 2 gals. 



Soap, hard . . . . . . . . I 1^- 



Water, hot 1 gal. 



The stock solution was diluted to a 20 per cent, spray, i.e. 1 gallon 

 of the stock solution was diluted with 2^ gallons of water. 



Experiment 3. The stock solution of carbolic acid emulsion was 

 made according to the formula: 



Soap, hard . . . . . . . . 1 lb. 



Water 1 gal. 



CarboUc acid, crude . . . . . . 1 pt. 



One part of this solution was diluted with 30 parts of water. 



