178 PATHOLOGY [Box. Absts., Vol. VII, 



to have any causal relation to the tumor. The possibility of this malformation being caused 

 by the crown gall organism or by other parasites or insects is discussed, and it is concluded 

 that the tumors are the result of some form of parasite not yet determined. — C L. Shear. 



1195. NowELL, W. The red wing or root disease of cocoanut palm. Tropic. Agric. 54: 

 240-245. 1920. 



1196. NowELL, W. Root disease of cacao. Jour. Jamaica Agric. Soc. 24 : 173-174. 1920. 

 — A partial reprint from Bull. Dept. Agric. Trinidad and Tobago 18. 1920. 



1197. NowELL, W. Mosaic disease of sugar-cane. Agric. News [Barbados] 19: 14. 1920. 

 — A review of Bulletin 829 of the U. S. Department of Agriculture, by E. W. Brandes, and of 

 Bulletin 19 of the Insular Experiment Station, Rio Piedras, Porto Rico. 



1198. Pachano, Abelaedo. EI mildew de la vina. [Downy mildew of the grape.] 

 Quinta Normal Estac. Exp. Circ. 9. 8 p. Ambato, 1918. — Introductory note by Martinez 

 states that grapes are raised in quantity only in a small part of the Province of Tungurahua, 

 but that conditions are such that grape growing might be greatly extended. Variety tests 

 are being conducted. The variety "White Muscatel of Alexandria" does not ripen at the 

 "Quinta Normal," but should do well in the valley of Patata. A summary of the symptoms, 

 cause, and control of the downy mildew caused by Plasmopara viticola is given. It is believed 

 that it was introduced from North America eight or ten years previously. — F. M. Blodgett. 



1199. Pachano, Abelardo. Dos enfermedades de las papas. [Two diseases of pota- 

 toes.] Quinta Normal Estac. Exp. Circ. 7. 11 p. Ambato, 1918. — Discusses symptoms, 

 cause, and control of late blight caused by Phytophthora infestans and early blight caused by 

 Alternaria solani. In the comparatively dry climate about Ambato, the early blight is 

 much the more serious, and spraying with bordeaux mixture gave poor results. — F. M. 

 Blodgett. 



1200. Pole, Evans, I. B. Anthracnose or zwart roest of the grape (Gloeosporium ampelo- 

 phagum, Sacc.) South African Fruit Grower 7: 219. PI. 1-2. 1920. 



1201. PuTTEMANS, A. Unc nouvelle maladie de la vigne. — L'arrachement des grappillons. 

 [A new grape disease. — Pulling off of the grapes.] Bull. Soc. Path. Veg. France 7: 34-36. Fig. 1. 

 1920. — The Isabella grape {Vitis labrusca) in Brazil has recently shown a diseased condition 

 in which the grapes are partially torn from the rachis; they then become livid and shrivel up. 

 Other grapes immediately surrounding the first soon become diseased and finallj' fall off; 

 this suggests a parasitic disease spread by contact. But no parasitic organism has yet been 

 found. In some cases one-third or even one-half of the grapes are destroyed bj'' this dis- 

 ease. The author thinks that the trouble may be due to certain climatic conditions, espe- 

 cially to the sudden variations in temperature, which amount to as much as 30 or 40 degrees C. 

 in 24 hours. Heat and humidity may be able to cause so great disturbance in the activities 

 of the plant as to produce these results. The most compact bunches are affected. The 

 berries grow to abnormal size and crowd each other until some are torn loose by the pressure. 

 — C. L. Shear. 



1202. Ramirez, Roman. Enfermedad de los arboles de limon. [A lemon disease.] Rev. 

 Agric. [Mexico] 5:278-279. 1 fig. 1919. — A leaf spot due to Cladosporium sp. and Macro- 

 sporium sp. — John A. Stevenson. 



1203. SPAtJLDiNG, Perlet. Scientific research in 1919 conducted by the OflSce of Inves- 

 tigations in Forest Pathology. Report on white pine blister rust control in 1919. Amer. Plant 

 Pest Committee Bull. 4: 10-11. 1920. — The author reports experimental work on Cronartium 

 ribicola by H. H. York at North Conway, New Hampshire, and L. H. Pennington at Lewis, 

 New York viable aeciospores have been caught in traps after having been blown for a distance 

 of 15 or 20 miles and carried upward 5000 feet. Viable urediniospores were caught up to a 



