74 Bacterial Blhjht of Pear BIossoiuh in South Africa 



capsule always present, motile by means of 1 — 5 polar flagella. Gram- 

 negative. 



Forms spreading yellowish-white colonies in nutrient agar, fluores- 

 cent; fluorescence absent in media containing dextrose; gelatine is 

 not liquefied ; nutrient bouillon heavily clouded ; milk slowly pepton- 

 ised, no change in reaction. Uschinsky's solution clouded, fluorescent, 

 growth viscid ; potato growth moderate. 



Fairly active proteolytic agent; starch slowly destroyed; acid 

 from dextrose and galactose, no gas or acid from any of the other 

 carbohydrates tested ; no indol ; nitrates not reduced. 



Facultative anaerobe ; optimum temperature 25 — 30° C. ; t.d.p. 

 49° C. 



LITERATURE CITED. 



1. Barker, B. T. P. and Grove, Otto. A bacterial disease of fruit blossom. 



Annals of Apj)lied Biulo(jij, vol. i, pp. 85-97, 1914-15. 



2. A bacterial disease of the Gooseberry. Annual Report uj Ihc Agricultural 



and HarticuUural Research Station, Long Ashton, Bristol, 1915, p. 97. 



3. DoiDGE, E. M. A bacterial disease of pear blossom South African Fruit-Grower, 



vol. II, No. 7, Jamiary 1915, p. 125. 



4. DUGGAR, B. M. Funrjous diseases oj plants, 1911, pjj. 121-129. 



5. Jones, D. H. Bacterial blight of apple, pear and quince trees, Ontario Agri- 



cultural College. Bull. 176, pp. 1-63, 1909. 



6. Jones, L. R. Studies upon plum blight. Cenlralblat. f. Bald. 11 Abt. Band 



IX, pp. 834-841,' 1902. 



7. OsTERW ALDER, A. The bacterial bloom and twig blight of fruit trees. Landw. 



Jahrb. Schweiz., xxix (1915), No. 1, jip. 29-30. Abstract in U.S.A. Depart- 

 ment of Agriculture, Experiment Station, Records, \ol. xxxiv, No. 41, March, 

 1910. 



8. Smith, Erwin V. A. Conspectus of Bacterial diseases of plants. Annuls of 



the Missouri Botanical Garden, vol. ii, pp. 377-401, February-April, 1915. 



9. Bacteria in relation to plant diseases, Washington, vol. i, 1905, pp. 65, 71, 



92, 113, 158, 215; vol. ii, 1911, pp. 40, 65, 190. 



10. Waite, Merton B. Results from recent investigations in pear blight. Proc. 



Am. Ass. Ado. Sci. 40th meeting, Salem, 1892. 



11. Whetzel, H. H. The bUght canker of apple trees, New York (Cornell). 



Agricultural Experimental Station, Bull. 236, pp. 104-138, 1906. 



Botanical, Laboratories, Pretoria. 

 January, 1917. 



