DISEASES OF PLANTS. 1057 



the preparation of Bordeaux mixture is of great importance. Quick 

 lime only should be used, and it should be slaked at the time of using. 

 On account of the remarkable adherence of resin mixtures, especially on 

 the fruit, the author proposes continuing investigations with fungicides 

 containing this substance. 



Means for preventing the introduction of plant diseases, J. E. Weiss (I'rakt. 

 Bl. Pflanzenschutz, 2 {1890), No. 1, pp. 5, 6). 



Contributions to the knowledge of parasitic fungi, (i. Lagerheim ( Vet. AJcad. 

 Eandl. Bihang K. Srenska, 24 (189S), No. 4, pp. .', pis. 3; aba. in Bot. Cental., 77 (1S99), 

 No. 12, pp. 405, 406). — Notes are given on Cladochytrium alfalfa n.sp., parasitic on 

 alfalfa, Empusa phalangicida n.sp. on insects, and IoJa (Cystobasidinm) laaioboli n.sp. 

 on Lasiobohm cquinus. 



Apple and pear scab, G. Staes (Tijdschr. Plantenziekten, 4 (1S98), No. 5, pp. 157- 

 160). — Notes are given on Fusicladium dendriticum and F. pyrinum, and the use of 

 Bordeaux mixture is recommended for preventing the diseases. 



Combating the leaf diseases of fruit trees, P. Held (Dent. Landw. Presse, 25 

 {1898), No. 92, p. 966). — Brief descriptive notes are given on a number of fungi attack- 

 ing the leaves of fruit trees and directions for combating them. Bordeaux mixture, 

 copper-soda solution, Burgundy mixture, and sulphur are the fungicides recommended. 



A disease of peach trees, J. Ritzema-Bos (Tijdschr. Plantenziekten, 4 J(1898), No.-', 

 pp. 146-154). — Notes are given on Manilla fructigena. 



A report on the diseases of the chestnut in the Pyrenees, Basque Provinces, 

 Spain, and Portugal, L. Crie (Bui. [Hin. Agr. France], IS (1899), No. 6, pp. 1291- 

 1313). 



Studies of the hexenbesen rust of barberry, J. Eriksson (Beitr. Biol. Pflanz., 

 S (1898), No. 1, pp. 1-16, ph. 3). — Studies on Puccinia arrhenaiheri. 



A destructive disease of conifers, Dosch (Ztschr. Landw. Ver. Hessen, 1S9S, No. 

 39, pp. 385, 386). 



On the appearance of a sereh-like disease of sugar cane, M. Raciijorski ( M< rf< <l. 

 Proefsiat. Suikerriel West Java, No. 36, pp. 5-10). 



The "Dongkellan" disease of sugar cane, M. Raciborski | Meded. Proefstat. Sui- 

 kerriet West Java, No. 36, pp. 1-5). — A description is given of this disease, together 

 -with notes on its distribution. It is said to be very distinct from the disease 

 described by Wakker under the same name. 



Pestalozzia diseases of seedlings, J. Ritzema-Bos (Tijdschr. Plantenziekten, 4 

 {1898), No. 6, pp. 161-172, pis. 3).— -Notes are given on attacks of Pestalozzia hartigii 

 and P.funerea on Paendotsuga douglasii, ChannEcyparia menziesii, Biota, Cupressus, 

 Juniperus, Pinus, etc. 



A bacterial disease of the leaves of Oncidium, V. Peglion (Cenlbl. Bakt. u. Par., 

 2. Alt., 5 (1899), No. 1, pp. 33-37).— An organism, to which the name Bacterium oncidii 

 n.sp. is given, has been isolated and the author claims by his experiments to have 

 demonstrated that it causes a serious disease of these plants which are cultivated to 

 a considerable extent in Italy. The organism is 1.3 to 1.5 fi in length aud 0.8 to 1 /< 

 in diameter and is said to grow readily in the more common culture media. 



The common parasite of the powdery mildews, D. GRIFFITHS ( /•'»/. Torrey /•'«/. 

 Club,26(lS99),No.3,pp.l84-188,pl.l).—Xote$ are given of Ampelomyces quisqualia 

 parasitic on a number of the powdery mildews. This parasite lias usually been 

 referred to under the generic name Cicinobolus. 



Concerning a parasite of Lactarius deliciosus, R.Mairk (Bui. Herb. Boiaaier, 7 

 {1899), No. 3, pp. 137-143). — Hypomycis vuilleminianua n. sp. is described. 



A parasite of Lactarius torminosus, R. Maire (Bui. Herb. Boiaaier, 7(1899), No. S, 

 pp. 144, 145).—Hypomyces thiryanits n. sp. is described. 



Root swellings of sugar beets, S. Stoklasa (Centbl. Bakt. u. Par.. ?. AM.. ■' ( 1899), 

 No.3,pp.95-9S).—T:y>o forms of excrescences aro recognized, one where the excres- 

 cence is joined to the upper or middle part of the root by a constricted growth and 



