No. 2, September, 1920] PATHOLOGY 277 



of a susceptible variety that is free from the disease. The bad effects of this disease seem to 

 be comparatively small as these susceptible varieties have been grown successfully for years. 

 The mosaic disease is not curable and it does not seem to be influenced by the root disease 

 or by fertilization and cultivation. — C. \V . Edgertun. 



2119. Grey, Robert M. The mosaic or mottling disease. Louisiana Planter and Sugar 

 Manufacturer 63: 199. 1919.— An answer to the communication of F. S. Earle (Louisiana 

 Planter and Sugar Manuf. 63: 167. 1919). Sugar cane plants affected with the mosaic, and 

 so identified by authorities of the United States Department of Agriculture, recovered from 

 the trouble in 116 days. — C. W. Edgerton. 



2120. Grey, R. M. The new cane disease in Cuba. Louisiana Planter and Sugar Manu- 

 facturer 63 : 90. 1919. — The mosaic or mottling disease has been in Cuba for a number of 

 years. From observations made at the Harvard Experiment Station, Central Soledad, Cien- 

 fuegos, Cuba, the claim is made that the disease causes little or no loss and that stalks will 

 frequently ougtrow the trouble. It is believed that the prevalency of the disease is influenced 

 by such weather conditions as rainfall. — C. W. Edgerton. 



2121. Johxston, John R. The new cane disease in Cuba. Louisiana Planter and Sugar 

 Manufacturer 63: 43. 1919. — The mosaic, yellow-stripe, or mottling disease of sugar cane 

 exists in at least three provinces of Cuba. The disease tends to stunt the growth of the cane, 

 causing a decrease in tonnage. The history of the disease in other countries is discussed 

 and the author considers that cane should be prohibited from entering Cuba from the other 

 countries. — C. W. Edgerton. 



2122. Zeno, Rafael del Valle. "Mottling" or "Yellow Stripe" disease of sugar cane. 

 (Some facts relative to the importance of the discovery of the "morbid" cause.) Published 

 privately with two colored plates by author. New York, 1919. — Symptoms of the disease are 

 given as a general yellowing of the leaves, which by close inspection is seen to be caused by 

 interrupted streaks, elongated more or less in the direction of the midrib, of a pale green 

 color. Growth of the plants is slow and "closing" of the rows retarded. Development of 

 the canes is more puny than in the healthy plants; the internodes are spindle shaped. Ter- 

 minal roots are destroyed and the plant can not obtain sufficient nutritive elements from the 

 soil. Good cultivation has no effect on the course of the disease. — "Not because of greater 

 merit than that of my predecessors, but by the chance of having been guided to the right 

 road I can offer today to my country and to all those who have cane plantations the solution 

 of this vital problem, having discovered the cause of 'mottling' and practical methods for 

 raising plantations completely free from this disease and saving the sugar world millions of 

 dollars." — "Cost of the treatment will vary with the class of labor in each locality, method 

 of application (manual or mechanical), number of cuttings per acre, etc., but it is an insignifi- 

 cant sum, possible to be reckoned always as an ordinary expense in raising plantations of cane. 

 Before any sugar planter need pay for the revelation of the secret of this discovery, a series 

 of experiments demonstrating the truth and efficacy of the treatment will be made before a 

 committee composed of competent agronomists and interested planters." — "The committee, 

 composed of Srs. Georgetty, Benitez, D. E. Colon, Wale & Veve, has stipulated certain con- 

 ditions to be fulfilled." — The writer makes some general remarks on other diseases, states that 

 the pulling out of diseased stools has no scientific basis and proposes to reveal his secret for 

 a prize. Appended to the paper are credentials consisting of letters of introduction from 

 the governor of Porto Rico, other officials and prominent sugar planters and extracts from 

 statistical reports of the Insular Department of Agriculture, showing decreases in production 

 of sugar from 1916 to 1919.— E. D. Brandes. 



