BIBLIOGRAPHY. 



A bibliography of curly-top follows : 



1. Arthur, J. C. Proceedings, American Association for the Advancement of 



Science, vol. 38, 1SS9, p. 280. 



Probably the first account of the disease now known as stigmonose. 



2. and Bolley, H. L. Bulletin 59, Purdue University Agricultural 



Experiment Station, vol. 7, 1896. 



Stigmonose of carnations is described under the name " bacteriosis." 

 The disease is regarded as mainly affecting the leaves. 



3. and Golden, Katherine E. A disease of the sugar beet root. 



Proceedings, Indiana Academy of Science, 1891, p. 92. 



These writers verified an appearance of bacteria in the roots of beets 

 affected with a leaf-curl, producing a " savoyed " appearance in the leaves. 

 They were unable to reproduce the symptoms by inoculating with pure cul- 

 tures of the bacterium. 

 4. Ball, E. D. The genus Eutettix. Proceedings, Davenport Academy of 

 Sciences, vol. 12. 



Ball here describes various species of leafhoppers, including the beet 

 leafhopper (Eutettix tenella Baker), and from the observed appearance 

 of the latter at the time of outbreaks of curly-top of beets is of the opinion 

 that this insect is the cause of the disease. 



5. The beet leafhopper. Sixteenth Annual Report, Utah Agricultural 



Experiment Station, June, 1905, p. 16. 



Ball here holds that the leafhopper {Eutettix tenella) is the cause of 

 curly-top. 

 6. The leafhoppers of the sugar beet, and their relation to- the curly- 



leaf condition. Bulletin 60, pt. 4. Bureau of Entomology, U. S. Dept. of 



Agriculture. Jan. 27, 1909. 



Ball here describes the beet leafhopper and closely related species and 

 concludes that Eutettix tenella is the cause of curly-top. Not experi- 

 mentally demonstrated. 



7. Beijerinck, M. W. Verhandelingen der Kroninklijke, Akademie van Weten- 



schappen te Amsterdam. 189S. 



Beijerinck proved the absence of bacteria in cases of the mosaic disease 

 and found that only dividing cells (meristemic) can become diseased. He 

 defines a milder form of the disease as a suffering of the chlorophyll 

 bodies; later on a general disease of entire plasmic contents. 



8. BtlscEN, M. Der Honigtau. Biologische Studien an Pflanzen und Pflanzen- 



lausen. Bes. Abdr., a. d. Jena Zeitschrift fur Naturwissenschaft, vol. 25, 

 N. F., vol. 18. 



Biisgen pointed out that the puncturing apparatus of the aphis does 

 not lacerate the plant cells, but passes between them. 



9. Bltsse, Walter. Bakteriologische Studien fiber die " Gummosis " der 



Zuckerruben. Zeitschrift fur Pflanzenkrankheiten, vol. 7, 1897, pp. 65- 

 77, 149-155. 



A disease bearing resemblance to curly-top is here referred to as 



" gummosis." 



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