DISEASES OF PLANTS. 465 



ill well arratod and well lii;litt'<l situations, especially in the autumn, would prevent 

 the occurrenct' of this disease. 



The bacterial disease of l)eets made its appearance in June, at which time the outer 

 leaves became wilted antl fell to the ground, the heart leaves beinjjunaffecrted. The 

 roots, when examined carefully, were found to have their extremities brownish 

 black and decaying. This decay spread rapidly, enveloping more or less of the root. 

 So far it has been observed in Belgium only upon garden and stock l)eets, but a some- 

 what similar trouble is reported upon sugar beets in Germany. 



Investigations of the botanical section of the experiment station of the 

 Pomological Institute, Proskau, R. Aderhold, {Centbl. Jiakt. k. Par., 2. Abt., 6 

 {1900), Xo. 19, pp. fJ;M-6^i:i, pi. 1). — Notes are given on a number of fungus diseases 

 that have been under investigation at the station for several years. A root disease 

 of young fruit trees has been studied for some time. The trees are attacked in their 

 roots while in the nursery. The camljial layer becomes brown antl the whole root 

 invaded by the mycelium of the fungus, resulting in the destruction of the young 

 trees. The wood of the roots becomes softened into a gummy mass. The cause of 

 this disease is said to be Septoq/lindrium radidcolum, n. sp., the technical characters 

 of which are described. It is found to attack the roots of Pyrus malus and Priuius 

 (muTii. The fungus grows readily upon several media, and inoculations were success- 

 fully made, which showed that the disease was due to this cause only. 



A test was made of a new fungicide called Propolisin. It seems to l)e some sort of 

 oil, and was added in a 1 per cent solution to a weak soap solution. This mixture 

 was sprayed on the apple and pear leaves and upon chrysanthemums. It was with- 

 out injury to the foliage, but had no practical value as a fungicide. 



Miscellaneous notes are given on an attack on apple twigs of Monilia c'merea; the 

 occurrence of a number of fungi upon apple leaves, among them species of Cladospo- 

 riuni, Phoma, and Hendersonia; the parasitism of Cyiosjmra rnbescens on pear shoots; 

 a disease of plum trees somewhat similar to black rot, but in which no organism was 

 found; descriptions of the maple woolly louse; the destruction of white pine trees by 

 attacks of Phizocloiiia strobi upon the roots of the trees; diseases of violets, hydran- 

 gea, and erica; an attack upon Acer platanoides by Ci/to.spora (irerhia, n. sp., the fungus 

 being described; a leaf spot and nematode disease of lily of the valley, the fungus 

 causing the leaf spot l)eing described as Sepioria mnjalis, n. sp. ; and a new disease of 

 narcissus caused by the parasitism of I'hijlloHticta narcissi, n. sp. 



Report of botanist, P. H. Kolfs {South Carolina Sta. Rpl. 1900, pp. 21-28).— 

 The author mentions the occurrence and briefly describes a number of diseases of 

 economic plants, including cotton-boll rot, corn rust and smut, wheat rust and leaf 

 blight, rice-leaf spot, oat smut, hop-leaf spot, asparagus rust, tomato l)acterial blight, 

 a disease of Irish potatoes prol)al)ly due to a species of Fusarium, apple rust and scab, 

 a])j»ie canker, ]iear-leaf scald and blight, black knot, and peach yellows. 



Investigations concerning the distribution of parasitic fungi by the vrind, 

 C. vox TuBEi-F {Arb. K. Gesauilheiimmie, Biol. Abt., H {1901), No. 1, p}>. 175-177).— 

 The win<l as a means of distribution of fungus diseases is discusseil, and numerous 

 instances cited in -which the spores of the fungi have been borne l)y the winds to dis- 

 tances of from 80 to 500 meters. 



A reply to Alfred Fischer relating to plant diseases due to bacteria, 

 E. F. Smith {Centbl. Bakt. u. Par., 2. Abt., 7 (1901), Nos. S, pp. SS-100; 4, pp- 128-139; 

 5-6, pp. 190-199, pis. 11). — The author reviews some of the literature relating to 

 bacterial di.<ea.«es of plants, and descril)es at length his experiments in which he 

 worked out the nature of the cucurbit wilt, due to Barillnn Irarlieijihilus (E. S. R., 7, 

 p. 311); the cabbage brown rot (Pseiulomoiias campestris) (E. S. R., 9, p. 849); and 

 the bacterial rot of potatoes, caused by Bacillus solanacearum ( E. S. R., 8, p. 895). 



The cultural characters of Pseudomonas hyacinthi, P. campestris, P. 

 phaseoli, and P. stewarti, four one-tiagellate yellow bacteria parasitic on 



