30 PATHOLOGY [Bot. Absts., Vol. VI, 



PATHOLOGY 



G. H. Coons, Editor 

 C. W. Bennett, Assistant Editor 



213. Anonymous. Disposiciones vigentes sobre el servicio de sanidad vegetal. [Regula- 

 tions in force relating to the plant sanitation service.] Ofic. Sanidad Veg. Sec. Agric. Com. y 

 Trab. [Cuba] 32 p. 1919. — This publication contains all quarantine and other regulations 

 in force in Cuba for the control of injurious insects and plant diseases. An appendix gives a 

 number of regulations enacted by other countries, which are applicable to plant products of 

 Cuban origin. — S. C. Bruner. 



214. Arango, Rodolfo. Algunas plagas de nuestros cultivos. [Some pests of our culti- 

 vated crops. Ofic. Sanidad Veg. Sec. Agric. Com. y Trab. [Cuba] Bol. 2. 94 p., 23 pi., 20 fig., 

 1 map. 1919. — A popular treatise on some of the more common plant diseases and insect pests 

 occurring in Cuba. The diseases considered are the bud-rot of the coconut (attributed to 

 Bacillus coli communis) , the Panama disease of bananas (due to Fusarium cubense), and gum- 

 mosis of the orange (the more common form of which is caused by a species of Phytophthora). 

 The closing chapters are devoted to spraying operations and notes on tree surgery. — S. C. 

 Bruner. 



215. Ball, E. D., and F. A. Fenton. What per cent of tipburn is caused by the potato 

 leafhopper? Jour. Econ. Entomol. 13: 218-221. PI. 2. 1920. — Continuation of hopperburn 

 studies (Bot. Absts. 3, Entry 387). A number of fields of potatoes about Ames, Iowa, were 

 kept under continuous observation during the entire season. No evidence of "tipburn" 

 was found in the field until after the nymph generation developed from the over-wintering 

 leaf-hopper. The amount of burning was found to be proportional to the number of leaf- 

 hoppers on the particular leaves. In fields where there were no leaf -hoppers "tipburn" did 

 not appear. — The author gives results of studies with the use of cages to exclude and to include 

 leaf -hoppers. — A. B. Massey. 



216. Belgrave, W. N. C. A wet rot of Para rubber roots. Dept. Agric. Federated Malay 

 States Bull. 28. 21 p. 9 pi. 1919. — Symptoms of this disease are a wet rotting of diseased 

 wood, the fungus rapidly entering the heartwood and advancing fastest there; collapse and 

 decay of the inner bark; the frequent presence of a tough skin-like dark, brownish red myce- 

 lium mass intimately bound up with the outer bark layers; the absence of obvious mycelial 

 strands, the presence of small, powdery-looking, yellow pustules; the presence of brown lines 

 in the wood; the presence of discoloured, light brown areas in the wood. The spread of the 

 fungus is by contact of roots with diseased material. Fructifications are rare. Originally 

 determined as Poria hypolateritia (Berk), since found to be Poria pseudoferreus Wak. As 

 the fungus so rarely fruits, "clean-clearing" an estate is a practical preventative. — T. F. 

 Chipp. 



217. Belgrave, W. N. C. Notes on mycology during 1918. Agric. Bull. Federated Malay 

 States 7: 141-143. 1919. — The diseases of Para rubber examined in Malaya during 1918 are 

 discussed. 



218. Beumee, C. G. B. Over Bastverwondigen aan den djati. [Bark wounds of teak.] 

 Mededeel. Proefsta. Boschw. Dept. Landb. Nijverheid en Handel Nederlandsch-Indie' 4: 

 31-54. PI. 12-17. 1919. — An introductory discussion is given of the tissues which take part 

 in wound healing. Among the causes of injuries which are not followed by regeneration of 

 the affected tissues are: (1) Fires in teak woods, — these are usually ground fires rather than 

 crown fires. (2) Theft of bark, — buffalo herders take strips of bark to use for cord or rope. 

 An illustration is given of a tree from both sides of which strips of bark had been taken, with 

 the result that the intervening wood had entirely rotted away. (3) Felling wounds produced 

 by felled trees falling against those which remain standing. Injuries are also described due 



