BIBLIOGRAPHY. 39 



21. Moulton, Dudley. Pear thrips and its control. Bulletin 80, pt. 4, Bureau 



of Entomology. IT. S. Dept. of Agriculture. 1909. 



Moulton describes the work of thrips on pear foliage and fruit, showing 

 that these insects produce a stigmonose. 



22. Ravaz, L. Progres agricole et viticole, nos. 21 and 24. 1900. 



Ravaz describes a disease of the vine under the name " Le Court-Noue," 

 which shows all the characteristic markings and symptoms of mosaic 

 disease. 



23. Smith, Erwin F. The bacterial diseases of plants. A critical review of 



the present state of our knowledge. American Naturalist, vol. 30, 1896, 

 p. 116. 



Smith reviews the work of Arthur and Golden and holds that the dis- 

 ease they investigated was curly-top. 



24. Smith, Ralph E. Report of the plant pathologist to July 1, 1906. Bul- 



letin 184, California Agricultural Experiment Station, pp. 240-241. 

 The appearance of beets affected with curly-top is here described. 



25. Sturgis, William C. Twenty-Second Annual Report, Connecticut Agri- 



cultural Experiment Station (1S98), pp. 252, 253, 1899. 



A critical review of the work done on the mosaic disease to that time 

 is presented, together with the writer's own observations and conclusions. 



26. Twenty-Third Annual Report, Connecticut Agricultural Experiment 



Station (1S99), vol. 3, 1900, p. 253. 



The writer here points out that close, clayey soils are favorable to the 

 development of mosaic disease because unfavorable to the even growth 

 of plants. 



27. Suzuki, U. Bulletin of the College of Agriculture, Tokyo Imperial Uni- 



versity, vol. 4, no. 3, July, 1900. 



Suzuki refers to a trouble of mulberry trees in Japan that evidently 

 is related to the mosaic disease. 



28. Townsend, C. O. Some diseases of the sugar beet, in Progress of the Beet- 



Sugar Industry in the United States in 1901. Report 72, U. S. Dept. 

 of Agriculture, pp. 93-95. 



Townsend concludes that curly-top is due to a lack of moisture at the 

 taproot. 



29. Curly-top, a disease of the sugar beet. Bulletin 122, Bureau of Plant 



Industry. U. S. Dept. of Agriculture. 190S. 



The writer here reviews the work on the nature and cause of curly- 

 top of beets, recites the various theories advanced, and shows that none 

 of them to that date had accounted for it. 

 30. Troube, M. J. La jaunisse de la betterave. La Sucrerie Indigene et Colo- 

 niale, vol. 48 (1896), no. 12, pp. 338-340. 



Troude describes a disease of beets occurring in France which causes 

 the leaves to become covered with yellow spots; these finally coalesce and 

 the entire leaf becomes pale yellow. The development of this disease, 

 which seems to bear some resemblance to the mosaic disease, appears to 

 be greatly influenced by weather and soil conditions. 

 SI. Wilhelmj, A. Eine Eigenartige Riibenkrankheit. Zeitschrift des Vereins 

 der Deutschen Zucker-Industrie, April, 1907. 



The writer is of the opinion that curly-top is closely connected with the 

 water supply. 

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