DISEASES OF PLANTS. 375 



hei^'lit of from 0.2 to 0.;'> meter. At tliis time the stems and the jirincipal veins of 

 tlie leaves were ohserved to lie more or less covered with o])lonj5 spots in which the 

 tissue was discolored and depressed. As the disease progressed the stems and veins 

 became covered with spots, the central portion of which became dry and white. 

 The diseased stems lost their rigidity and the leaves became wilted. 



The names canker, anthracnose, smut, etc., have been given this disease, which, 

 according to the investigations of the author, is caused ])y atta(;ks of a sjjecies of bac- 

 teria to which the name Banllns uruginosus has been given. The disease is to be 

 studied further and the cause and possible means of prevention will be fully described 

 later. 



On the occurrence of the wilt disease of sesame, A. von Jaczewski {Ann. 

 ^[licol., 1 {1903), Xo. 1, pp. SI, 3£; ahs. in Bot. Centhl., 92 {1903), No. 23, p. 543).— 

 The author reports the presence of the fungus Xrocosmo.spora rasinfectn on the culti- 

 vated sesame. An examination of diseased j)lants showe<l the stems infested with a 

 mycelium, which was readilj' isolated and studied. From the characters observed, 

 the author is led to believe that it is due to the above-named fungus. If the fungus 

 should prove identical with that causing the wilt of cotton, cowpeas, melons, etc., 

 another host plant is added to the list of species subject to its attack. 



Tomato wilt, A. Despeissis {Jour. Dept. Agr. West Australia,? {1903) , No. 2, p. 103). — 

 A brief description is given of the bacterial blight of tomatoes, which has been 

 recently ascribed to attacks of BaciUus solani)icola. For the prevention of this disease 

 it is recommended that spraying with Paris green in order to destroy the leaf-eating 

 insects should be thoroughly practiced, and attention given to all other related jilants 

 which ma}' l)e attacked by this same organism. 



A disease of peas due to Fusarium vasinfectum, C. vax Hall {Bcr. Deut. Bot. 

 GeselL, 21 {1903), No.l,pp.2-6; abs.inBot. Centhl., 92 {1903), No. 16, pp. 363, 364).— A. 

 disease of peas due to attacks of a fungus, Fusarium vasinfectum, has been under observa- 

 tion in Holland for a number of years. The affected plants turn yellow and soon die, 

 and an investigation shows that the roots are the seat of the fungus attack. The 

 organism causing the disease has been isolated and studied on a number of media. 

 It is believed to be closely related to the fungus which causes the wilt of melons, 

 cotton, cowpeas, etc. , and the author has described it as F. vasinfectum jjisi n. var. 

 Inoculation experiments have been successfully performed showing that this fungus 

 is the cause of the disease. As it usually makes its appearance about June 24, the 

 disease is locally known as St. John's disease of peas. 



Two decays of stored apples, H. J. Eustace {Neir York State Sta. Bui. 235, pp. 

 123-131, pis. 4) . — A description is given of an apple rot which was observed to follow 

 the apple scab and a core decay of Baldwin ajiples. Subsequent to the publication 

 of the station bulletin on the pink rot of apples (E. S. R., 14, p. 1088) specimens of 

 diseased Rhode Island Greening apples were observed, which presented decayed 

 areas somewhat similar in general appearance as that described as pink rot. A more 

 critical examination, however, showed that the fungus causing the disease was entirely 

 different. 



In comparing the pink rot of apples and the decay caused by this new fungus, it 

 was found that in the pink rot there is usually a conspicuous white or pinkish growth 

 of the fungus in the center of the infected spot, while the new fungus does not show 

 at all conspicuously on the surface of the decayed spot until forced to do so by arti- 

 ficial conditions. The pink rot of the fruit is a very shallow growing fungus, pene- 

 trating the tissues not more than one-eighth of an inch, while the new disease extends 

 much deeper and in its later stages reaches to the core. The tissues decayed by the 

 pink-rot fungus are very characteristic and decidedly bitter, while the tissue decayed 

 by the other fungus is only slightly so. The fungus causing this nev/ rot was deter- 

 mined as a species of Hypochnus, a description of which is given. 



