120 FUNGOUS DISEASES OF PLANTS 



VII. HYACINTH DISEASE 

 Pseudomo?ias Hyacinthi (Wakker) Erw. Smith 



Smith, Erw. F. Wakker's Hyacinth Germ Pseudomonas hyacinthi (Wakker). 



U. S. Dept. Agl., Div. of Veg. Phys. and Path. Built. 26 : 1-45. pi. 1. 



Ibid. Built. 28 : r— 1 53. 1901. 

 Wakker, J. H. Vorlaufige Mitth. iiber Hyacinthenkrankheiten. Bot. Centrbl. 



14: 3IS-3I7- 1883. 

 Wakker, J. H. Onderzoek der Ziekten van Hyacinthen, en andere bol-en 



Knolgewassen (1884): 4-13. 



This organism, apparently confined to the Netherlands, is 

 related to the three already discussed, yet it is entirely distinct. 

 It produces a disease of hyacinths, entering the host through 

 wounds or through the nectaries. The vascular system is chiefly 

 affected, but the neighboring parenchymatous tissue is gradually 

 involved, the middle lamellae being the first portions of the walls 

 to succumb. The organism may require a year in which to destroy 

 the host. 



VIII. BUNDLE BLIGHT OF SUGAR CANE 



Pseudomonas vascularum (Cobb) Erw. Smith 



Cobb, N. A. Diseases of the Sugar Cane. New So. Wales Dept. Agl. (1893) : 

 1-21. 



Smith, Erw. F. Ursache der Cobb'schen Krankheit. des Zuckerrohrs. Cen- 

 trbl. f. Bakt. Parasitenk. u. Infektionskr. 13 (II Abt.) : 726-729. 1905. 



This organism is the cause of a disease of the sugar cane. 

 It is not uncommon in Australia, and probably also in Java, 

 Brazil, and other tropical countries. The organism attacks the 

 fibrovascular bundles, — the etiology of the disease is not unlike 

 that of Pseudomonas Stewarti Erw. Smith, — and a constant 

 symptom is the excessive development in the bundles of a yellow 

 gum. 



IX. PSEUDOMONAS : OTHER SPECIES 



Among other phytopathological species of special importance 

 in certain regions, yet less well known, or imperfectly reported 

 upon, are the following : 



Pseudomonas Juglandis Pierce is a parasite of the English or 

 Persian walnut (Juglans regid) in California. 1,2 Young nuts and 

 shoots are affected, and the disease is one of much importance. 



1 Pierce, N. B. Walnut Bacteriosis. Bot. Gaz. 31 : 272-273. 1901. 



2 Smith, R. E. Report of the Plant Pathologist to July 1, 1906. Calif. Agl. Exp. 

 Sta. Built. 184 : 232-236. figs. 2-4. 1907. 



