8 



DAMAGE TO SUGAE CANE BY THE SUGAR-CANE BORER. 



Samples 1 and 3 and samples 2 and 4 were thus from the same canes. 

 Each sample was carefully weighed, run through a 3-roller hand 

 mill, and the weight of juice from each sample recorded. The juice 

 was then analyzed, the latter operation being kindly performed by Mr. 

 W. G. Taggart, chemist at the sugar experiment station. 



Sample 2 (bottom joints) showed, compared with sample 1, losses 

 due to the borer of 4.59 per cent of juice, 2.6 per cent total solids, 

 4 per cent sucrose, and 12 per cent purity, and an mcrease of solids 

 not sugar of 0.8 per cent. 



Sample 4 (top joints), compared with sample 3, showed losses of 

 7.27 per cent of juice, 4.2 per cent total solids, 4.9 per cent sucrose, 

 and 13.7 per cent purity, and an increase of solids not sugar of 0.8 

 per cent. It can thus be seen that the borer not only reduced the 

 juice quantitatively but qualitatively as well and to a more marked 

 degree. 



Placing these figures on a basis of 1 ton of cane to the sample, 

 we have the folio w^ing results: Sample 2 showed losses of 91.8 pounds 

 of juice, 35.2 pounds of total solids, 59 pounds of sucrose, and a 

 percentage loss of sucrose of 34.04 per cent. The increase in solids 

 not sugar was 8 pounds per ton of cane. Sample 4 showed losses of 

 145.4 pounds of juice, 68.6 pounds total solids, 70.9 pounds sucrose, 

 and 46.43 per cent sucrose actual loss, with an increase of solids not 

 sugar of 5.4 pounds per ton. The average production of the total 

 borer-free cane (samples 1 and 3) was 163 pounds sucrose per ton of 

 cane and of the total infested cane (samples 2 and 4) 98.1 pounds 

 sucrose per ton of cane. This gives an average loss of 64.9 pounds, 

 or 39.81 per cent, of sucrose per ton of cane due to the borer. The 

 results of this experiment are given in tabular form in Table V. 



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



borer injury to sugar cane. 



Note. — Samples 1 and 3, 2 and 4, were from the same canes. Each sample consisted of portions of three 

 canes. Analysis made Nov. 10, 1910. 



