No. 1, July, 1920] PATHOLOGY 1 1)1 



obtained in general by spraying wit li a t wo per cent muri ure instead of a one per cent mixture. 

 In smoky districts the use of larger amounts, 6 and 7 pounds to id gallonc instead of the usual 

 o pounds, of soda tended to reduce | be danger of scorching. I hisl mn did not give as good re- 

 sults as spraying but where water or labor ifl short it may l>e used m place of spraying and 

 should be used in preference to no treatmenl if blight is likely to I"- Bevere. No considerable 

 gain in adhesiveness was secured through the use of soft soap, soap powder, or (.due — M. I',. 

 Mr Kay. 



1256. BROOKS, F. T. An account of some field observations on the development of potato 

 blight. New Phytol. 18: is? -200. 8 fig, 1919.— Field observations on the firel development 

 of Phytophtkora infusions were undertaken to det ermine the method of overwintering. While 



the problem was not solved, the firsl at tacks were found to be si rid ly limited in extent H here 

 infection was not extraneous. Infection spreads centrifugally from the point of appearance. 

 — /. F. Lewis, 



1257. Bbunbr, Stbbhen C. Notas sobre la enfermedad del mosaico de la cana de azucar. 

 [Notes on sugar cane mosaic] Revist. Agric. Com. y Trab. 2 : 532-533. tfig. 1919.- Several 



observations showing the infectious nature of the sugar cane mosaic are recorded. Healthy 

 plantings became infected from nearly diseased plantings. — F. M. Blodgctt. 



1258. Bruner, Stephen C. Informe sobre enfermedades del cafeto. [Report on coffee 

 tree diseases.] Revist. Agric. Com. y Trab. 2 : 533-535. 2 fig. 1919. — The occurrence of two 

 coffee tree diseases are recorded for the first time for Cuba, namely the thread blight caused 

 by the fungus Pellicularia koleroga and the iron spot (mancha de hierro) caused by the fungus 

 Stibella flavida. These are described and spraying with Bordeaux mixture is recommended 

 as a control. The leaf spot caused by Cercospora coffeicola is described and is said to be worse 

 with insufficient shading. — F. M. Blodgett. 



1259. Burkholder, Walter H. The dry root-rot of the bean. Cornell Univ. Agric. Exp. 

 Sta. Mem. 26: 999-1033. PI. 56-57; fig. 188-135. 1919.— In addition to the varieties of Pha- 

 seolus vulgaris the disease occurs on P. acutifolius latifolius, P. mutliflorus, P. aconitifolius, 

 P. lunatus, P. angularis, Vigna sinensis and Dolichos biflorus. Pisum sativum, Tri folium spp., 

 Vicia sp., Soja max, Zea mays, Solanum tuberosum, Avena saliva, Triticum sp., Ambrosia, 

 Prunella, Chenopodium and Rumex, all of which are grown in rotation with beans or occur as 

 weeds are not affected. — The disease occurs in 90 per cent of the fields of western New York. 

 In a wet season losses in experimental plats were about 5 per cent but in a dry season they were 

 50 per cent. — The roots are affected and slowly dry out; tap roots show reddish discoloration 

 and lesions extend into the stem but rarely appear above ground; foliage turns yellow; pods 

 wither or do not fill. Fusarium viarlii phascoli n. f. causes the disease. It differs from type 

 only in its parasitism on bean. The fungus winters as mycelium or chlamydospores in the 

 compost heap or field. Observation indicates that the organism may persist many years with- 

 out the living host. — The effect of external conditions on host and parasite are discussed in 

 some detail. — The following chemicals were used on the soil as disinfectants but none gave 

 any indication of value: lime, acid phosphate, sulfur, formaldehyde, calcium hypochlorite, 

 calcium cyanamid. — Individuals of a late, aberrant type of bean called Flat Marrow have 

 been found which are very resistant to the disease. Hybrids with commercial varieties have 

 shown a very complex segregation. No desirable White Marrow strain has been isolated as 

 yet. — Black root-rot, caused by Thielavia basicola, and blotch, caused by Rhizoctonia sp., 

 are described very briefly. — D. Reddiek. 



1260. Burkill, I. H. . Lightning and Hevea. Gardens' Bull. Straits Settlements 2 : 145. 

 1919. 



1261. Burleioh, W. B. Formaldehyde for damping off. Florists' Exchange 47: 445. 1919. 

 — The writer has used formaldehyde for 4 years with unvarying success. He does not allow 

 soil to dry out after treatment before sowing seed; uses soil wdiile moist but not wet as it gives 

 the seed also a moderate treatment. — L. A. Minns. 



