No. 1, July, 1920| PATHOLOGY 207 



Rosellinia sp., Uttulina zonula, Poria hypolateritia, Hymenochaete noxia, and Armillariaf— 

 R. D. Rands. 



1371. van Ham,, 0. J. J. Ziekten en plagen der cultuur gewassen in Nederlandsch-Indle 

 in 1917. [Diseases and enemies of cultivated plants in Dutch East Indies in 1917. | D<:pt. 

 Lund. Nijv. en Handel, Meded. Lab. Plantenziekten Buitenzorg 33 : 1 u. 1918. -Unusually 

 heavy rains of the west monsoon were considered responsible for the severe damage to rice 

 and tea from root diseases and 1 lie canker of Para rubber. The I'hytophthora disease of to- 

 bacco was prevalent as was also maize mildew (Sclerospora javanica) the latter causing large 

 losses in central and east Java. Detailed notes are Riven on the distribution and damage 

 caused by the common diseases of the more important crops. A report is appended showing 

 the results of inspections of imported plants and fruits. — R. 1>. Rands. 



1375. van Habbbveld, Ph. Stambibittuinen en zeefvatenziekte. (Sugar cane nurseries 

 and the sieve tube disease.] Arch. Suikerindus. in Nederlandsch-Indig 26:333-346. Feb., 

 191S. Also Meded. Proefstation Java-suikerindust. Pasoeroean, Landb. Ser. 1918, No. 4. — 

 This paper considers various points raised in a controversy between J. SlBINGA Muldkk, 

 (Indische Mcrcuur September 21, 28 and October 5, 1917), II. M. Quanjkr (Indische Mercuur 

 October 12, 1917), and the author. In support of the latter's contention that it is impossible 

 to free the crop from the sieve-tube or Sereh disease by producing the material for planting at 

 high elevations, experiments are cited to show that cane propagated at high elevations for 

 ten years still developed the disease when transferred to the flat land of the plantations. 

 Importations of varieties from many foreign countries in every case also became diseased. 

 Among the different bacteria isolated from diseased cane, one, which may be identical with 

 Bacillus vascular um, is considered the probable cause. — R. D. Rands. 



1376. Voc.kl, Irvin H. A rose graft disease. Phytopath. 9: 403-412. Fig. 1-6. 1919. 

 — The occurrence of a serious disease of rose grafts in forcing frames at Council Bluffs, Iowa, in 

 1916 and 1907 is reported, and the symptoms of the disease are described. Coniothyrium 

 rosarum, which was found to be associated with the trouble, was isolated and studied in cul- 

 ture and in its thermal relationships. It is stated that inoculations with this fungus induced 

 the disease on the rose, but gave negative results on the black raspberry, while C. fuckelii 

 from the black raspberry failed to infect the rose. Wide differences in varietal susceptibility 

 are noted and control measures are recommended. — G. W. Keitt. 



1377. von Busgen, M. Omnlvorie und Spezialisation bei parasitischen Pilzen. [Omni- 

 vorous and specialized parasitic fungi.] Zeitschr. Forst- u. Jagdw. 1919: 144-153. 1919. — A 

 treatise dealing with the probable causes for specialization and the omnivorous habits of 

 various parasitic fungi. Special discussion is given to the results of inoculation experiments 

 with Bolrytis vulgaris. — Hermann Krauch. 



1378. Walker, J. C. Onion diseases and their control. U. S. Dept. Agric. Farmers' 

 Bull. 1060. 23 p. Fig. 1-12. 1919. 



1379. Weir, James R., and Ernest E. Hubert. A study of the rots of western white 

 pine. U. S. Dept. Agric. Bull. 799. 24 p. 1919.— The fungi causing rot of western white 

 pine (Finns monticola) are mainly Trametes pini, Polyporus schweinitzii and Femes annosus, 

 the first named being most important. Estimated loss from rot in w'estern white pine area i- 

 $7,201,250. A study of factors relating to the cause, spread and control of this rot is based 

 upon data taken from an analysis of about 1400 trees felled in the white pine area. The 

 factors studied are relative age of tree, site, age of infection, injuries and sporophore produc- 

 tion. Percentage of infected trees increases consistently as the age classes increase from 

 41-60 years to 201 -years. This correlation is almost identical for both bottom and slope sites 

 the average per cent infection being 55 and 55.3 and the average per cent rot being 7.8 ami 

 6.1 respectively. Although a slightly higher percentage of infection prevails on slope sites the 

 per cent of rot throughout this study is highest on bottom sites. The underlying cause of 



