1922.] 



SUGAR CANE EXPERIMENTS 1919-81. 



211 



Table XVIII. — Loss due to Mosaic Disease. 

 First Ratoons, Field 11.— 20 Stools. 



Cane. 



Condition of 

 Cane. 



Canes. 



-3 0) 



■§.2? 







-3 w 0) 



r^ M o 



a. 



60-; 



2 ?3 



From the figures given in the preceding three tables it will be 

 seen that : 



(1) The percentage of diseased canes varied considerably showing 

 that certain varieties are more susceptible to the disease than others. 

 The range was from 3-4 to 50-9 per cent, for plant canes and 20'0 to 72-1 

 for first ratoons. 



(2) The figures in Tables XVII and XVIII are not strictly 

 comparable, the varieties not being the same throughout, nevertheless 

 there is sufficient evidence to show that the disease gets worse from one 

 year to the next, if left uncontrolled. Vide figures for B. 156, B. 10650 

 and B. 16536 in Tables XVII and XVIII. 



(3) The average weight of diseased canes is less than that of 

 healthy canes. The solitary exception being H. 146 (Table XVIII) for 

 which no explanation can be offered, other than possibly a large number 

 of the diseased canes were well grown canes which had only recently 

 been attacked. 



(4) With the exception of B. 10650 and the Bourbon vide 

 Table XVIII, the weight per foot of healthy ripe canes is greater than 

 that of diseased canes and 



(5) The true loss in weight on the crop has varied from G'16 to 

 15-07 per cent, for plant canes and 0*25 to 27-83 for first ratoons. 



With regard to the analytical results it will be seen from the tables 

 below that: 



(1) There is not much difference in the quality of the juice of healthy 

 and diseased canes. — Generally when the cane leaves alone are diseased 

 and the stalks apparently healthy or slightly diseased, there is very 

 little or practically no difference in the quality of the juice, vide B. 156, 

 B. 14761 and B. H. 10 (12) in Table XIX. When, however the cane 



