DAMAGE TO SUGAR CANE BY THE SUGAR-CAXE BOEER. 7 



These canes were then examined for borer injury, 72 being found 

 infested and 28 borer-free. The smallest damage to a cane by a 

 borer was sufficient to place it among the infested canes. The canes 

 were then weighed, with the results shown in Table III: 



Table III. — Effect ofhorer attach upon weight of cane. 



For further results a wagonload of cane was taken to the sugar- 

 house, and was there separated into two lots, uifested and uninfested. 

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

 injury by borers placed a cane in the infested lot. Each lot of cane 

 was tlien weighed separately on platform scales. The 393 infested 

 canes weighed 694 pounds, an average of 1.76 pounds per cane, 

 while the 341 borer-free canes weighed 626 pounds, or an average of 

 1.84 pounds per cane. 



Table IY. — Loss of weight due to borer attack. 



On the basis of Table IY the difference in yield between borer-free 

 and borer-infested cane fields would amount to a loss of about 1 ton 

 of cane per acre when the borer-free cane gives a yield of 25 tons 

 per acre. 



EFFECT OP BORER INFESTATION UPON CANE JUICE. 



The followmg series of experiments was carried out to ascertain 

 just what damage the cane borer inflicts upon the cane juice, in 

 addition to the physical damage to the cane plant: 



Experiment 1. — Six stalks of D. 74 cane were selected, tliree being 

 heavily infested by the borer and three being borer-free. The stalks 

 were cut into four samples, as follows: 



(1) 3|^ bottom joints, borer-free canes. 



(2) 3^ bottom joints, borer-infested canes. 



(3) 3^ top joints, borer-free canes. 



(4) 3^ top joints, borer-infested canes. 



