^12 



TRINIDAD AND TOBAGO BULLETIN. [XIX. 4. 



stalks reach the cankered stage the juice is of inferior quality ; compare 

 the figures for B. 6450 and B. 16536 in Table XIX and B. 16536 in 

 Table XX. A still greater difference in the quality of the juice is 

 obtained when the canes are badly cankered and cracked, vide 

 Table XXI, so that it appears that the quality of the juice varies with 

 the degree of infestation. The figures in Table XXI were obtained 

 from selected varieties of second ratoons badly cankered and cracked 

 and from which no diseased canes have been previously dug out. On 

 the whole they confirm those obtained by Dominguez, {^) who in addition 

 has pointed that the acidity of the juice from badly cankered canes is 

 appreciably higher than that from healthy canes or canes whose leaves 

 only are diseased. 



(2) Generally, the varieties showing the greatest loss in the field also 

 show the greatest loss in quality of the juice. 



(3) The percentage of loss on the quality of the juice has varied 

 from 0*04 to 3*17, for plant canes and 0'73 to 8*28 for first ratoons. 



(4) The loss in weight of cane is likely to be much greater than that 

 from deterioration in the quality of the juice, vide Table XXTI. 



Table XIX. — Loss due to Mosaic Disease. 

 Analytical Results. 



(1) Journ. Dept. Ar/r. Porto Rico, III No. 4, 1919. 



