10 



DAMAGE TO SUGAR CANE BY THE SUGAR-CANE BORER. 



60.72 pounds sucrose, and an increase in solids not sugar of 7.73 

 pounds. 



Comparing the percentage loss of sucrose in the heavil}^ infested 

 cane of tliis experiment, 34.51 per cent, with the average loss of 

 samples 2 and 4 in the first experiment, 39.81 per cent, and con- 

 sidering that the latter cane was more thoroughly infested than the 

 former, it will be seen that the results of the first experiment were not 

 exaggerated to any great degree by reason of the smallness of the 

 samples. The complete results of this experiment are shown in 

 Table VI. 



Table VI. — Analysis of sugar cane (D. 74) to determine effect on sugar content of the 



borer injury to cane. 



Note. — Each sample consisted of 10 canes. Each of the medium-infested canes contained from one to 

 throe infested joints, and each of the heavily infested canes five or more infested joints. Analysis made 

 Nov. 12, 1910. 



RESULTS OF ABOVE ANALYSIS 



FIGURED ON A BASIS OF 1 TON OF CANE TO 

 THE SAMPLE. 



Experiment 3. — In order to confirm the results of the two foregoing 

 experiments, and also to secure additional accurate data upon a 

 larger scale, a third and larger experiment was conducted early in 

 December, 1910. A wagonload of D. 74 cane was taken to the 

 sugar house and was there divided into two lots, borer-mfested and 

 borer-free, the least sign of borer injury throwing a cane upon the 

 infested pile. Of the 734 canes, 393, or 53.54 per cent, were infested. 

 Each pile of canes was loaded separately upon a wagon and weighed 

 on the platform scales. The 393 infested canes weighed 694 pounds, 



