MOSAIC OF SUGAR CANE AND OTHER GRASSES. 3 



Table I. — Tests of sugar cane, showing varietal resistance to the yellow-stripe (mosaic) 

 disease in the Hawaiian Islands. 1 



Variety. 2 



Plant cane (18 months 

 old): 



H227 



H151. 

 H135. 



H90. 



H38. 

 H27. 



H2. 



H197. 

 H276. 



H291. 

 H338. 



H339. 

 H355. 



First ratooned cane (11 

 months old): 



H363 



Condition. 



Num- 

 ber. 



/Striped 



\Healthy.... 



/Striped 



(Healthy.... 



/Striped 



\ Healthy.... 



/Striped 



\ Healthy.... 



/Striped 



(Healthy.... 



/Striped 



(Healthy.... 



/Striped 



\Healthy.... 



/Striped 



(Healthy.... 



/Striped 



(Healthy.... 



/Striped 



(Healthy.... 



/Striped 



(Healthy.... 



/Striped 



(Healthy.... 



/Striped 



(Healthy.... 



/Striped 



(Healthy.... 



H197. 

 H109. 



H27. 



Yellow Caledonia. 

 H22 



H20. 



/Striped.. 

 (Healthy. 

 /Striped.. 

 (Healthy. 

 /Striped.. 

 (Healthy. 

 /Striped.. 

 (Healthy. 

 /Striped.. 

 \Healthy. 

 /Striped.. 

 (Healthy. 

 /Striped.. 

 (Healthy. 

 /Striped.. 

 (Healthy. 



Canes. 



60 

 212 



50 

 248 



50 

 292 



57 

 244 



38 

 265 



16 

 296 



39 

 172 



16 

 174 



34 

 154 



32 

 196 



79 

 185 



20 

 191 



15 

 126 

 219 



70 



75 



66 



58 



310 



109 



213 



243 



34 



16 



372 



260 



68 



24 



345 



Aver- 

 age 

 weight. 



Pounds 

 4.10 

 5.17 

 5.73 

 6.57 

 5.69 

 6.96 

 5.50 

 7.08 

 4.50 

 6.12 

 5.12 

 5.60 

 8.03 

 9.16 

 4.00 

 6.39 

 6.34 

 6.90 

 6.01 

 6.96 

 4.05 

 5.10 

 4.00 

 5.50 

 4.03 

 5.25 

 5.25 

 6.03 



4.73 

 5.13 

 2.80 

 3.60 

 3-99 

 3.96 

 3.50 

 4.08 

 4.89 

 6.51 

 2.56 

 3.66 

 3.09 

 4.37 

 4.10 

 4.73 



Test of juice. 



Brix 



scale. 



Beg. 

 18.5 

 18.0 

 18.4 

 18.8 

 17.3 

 17.2 

 18.5 

 18.3 

 18.7 

 18.8 

 19.3 

 18.8 

 19.1 

 18.7 

 18.8 

 18.5 

 19.0 

 18.8 

 18.1 

 18.2 

 20.0 

 19.8 

 19.8 

 20.2 

 16.7 

 17.7 

 18.8 

 19.2 



19.3 

 19.2 

 19.9 

 20.3 

 19.5 

 19.9 

 19.0 

 19.1 

 18.5 

 19.6 

 19.7 

 19.1 

 17.6 

 17.8 

 19.3 

 19.9 



Su- 

 crose. 



Per cent. 

 16.7 

 16.2 

 16.5 

 16.9 

 15.7 

 15.4 

 16.6 

 16.3 

 16.6 

 16.6 

 17.7 

 17.2 

 17.1 

 16.7 

 16.9 

 16.4 

 17.1 

 16.8 

 15.7 

 15.8 

 18.1 

 17.9 

 17.6 

 18.0 

 14.5 

 15.4 

 15.5 

 15.7 



17.2 

 17.2 

 18.2 

 18.7 

 17.9 

 18.2 

 16.7 

 16.8 

 16.4 

 17.5 

 17.8 

 17.0 

 15.2 

 15.5 

 17.3 

 18.1 



Requirement 



per ton of 



sugar. 



Pur- 

 ity. 



Per cent. 

 90.3 

 90.0 

 89.7 

 89.9 

 90.8 

 89.5 

 89.7 

 89.1 

 88.8 

 88.0 

 91.7 

 91.5 

 89.5 

 89.3 

 89.9 

 88.6 

 90.0 

 89.4 

 86.7 

 86.8 

 90.5 

 90.4 



87.0 



82.4 

 81.8 



89.1 

 89.6 

 91.5 

 92.1 

 91.8 

 91.5 

 87.9 

 88.0 

 88.6 

 89.3 

 90.4 

 89.0 

 86.4 

 87.1 

 89.6 

 91.0 



Weight Num- 



of ber of 



cane, canes. 



Tons. 

 7.81 

 8.07 

 7.95 

 7.73 

 8.29 

 8.52 

 7.90 

 8.07 

 7.92 

 7.96 

 7.33 

 7.55 

 7.67 

 7.86 

 7.73 

 8.04 

 7.64 

 7.81 

 8.49 

 8.41 

 7.21 

 7.29 

 7.47 

 7.31 

 9.17 

 8.63 

 8.81 

 8.73 



7.65 

 7.63 

 7.13 

 6.91 

 7.22 

 7.13 

 7.91 

 7.86 

 8.04 

 7.50 

 7.33 

 7.74 

 8.77 

 8.57 

 7.08 

 7.19 



3,810 

 3,122 

 2,775 

 2,353 

 2,914 

 2,448 

 2,873 

 2,280 

 3,520 

 2,606 

 2,863 

 2,696 

 1,910 

 1,716 

 3,865 

 2,517 

 2,410 

 2,264 

 2,825 

 2,417 

 3,561 

 2,859 

 3, 735 

 2,659 

 4, 551 

 3,288 

 3,356 

 2,895 



3,235 

 2,975 

 5,090 

 3,840 

 3,619 

 3,601 

 4,520 

 3,853 

 3,288 

 2,304 

 5,727 

 4,229 

 5,676 

 3,693 

 3,454 

 3,040 



Loss 

 due to 

 disease. 



Percent. 

 18.05 



J 15.20 

 15.97 

 20. 64 



I 26.09 

 5.83 

 10.16 

 34.9 

 6.06 

 14.46 

 19.7 

 46.45 

 27.76 

 13.72 



8.04 

 24.63 

 .5 

 14.76 

 29.93 

 26.1 

 30.9 

 11.97 



i Lyon, H. L. Losses due to yellow stripe disease. In Hawaiian Planters' Rec, v. 6, No. 5, p. 258-263, 

 1912. (Permission to use the data in this table was obtained from the editor of the Hawaiian Planters' 

 Record.) 



2 H= Hawaii seedling. 



Table I indicates clearly that the loss is due almost entirely to 

 reduced tonnage. Diseased canes are uniformly much lighter than 

 healthy canes of the same variety. 



During the early part of the present year the mosaic disease was 

 discovered by the writer at three different points in Cuba, apparently 

 as the result of separate importations. At Cienfuegos it has been 

 present for nearly 20 years, but as a result of discarding diseased 

 plants in the seedling and propagating fields because of their unthrifty 

 appearance, and perhaps partly owing to the fact that a proper agent 



