No. 3, Janttart, 1922] PATHOLOGY 193 



mildew, Sclerospora sacchari, has been imported into the Philippines from Formosa. All 

 possible measures have been taken to eradicate the disease. — C. J. Lyon. 



1277. MoiR, W. Stuart. Recent observations on American white pines in Europe. Amer. 

 Plant Pest Committee Bull. (5: 7. [1921?] — In Norway, Sweden, and Denmark white pine 

 (Pinus strobus) is no longer considered a profitable tree because of the ravages of blister rust. 

 Gooseberries and currants, especially black currants, are very plentiful, and no attempts are 

 made to control the rust by eradicating these alternate hosts. White pine is being replaced 

 by Douglas fir and Sitka spruce. In Belgium cultivation of white pine has been abandoned 

 because of the destructiveness of the rust. In France the disease is not considered particu- 

 larly destructive. However, the author found a large percentage of the regeneration attacked 

 and mature trees killed. Observations made in Europe on the susceptibility of sugar pine, 

 western white pine, and limber pine show that these species are as readily attacked and as 

 severely damaged as the eastern American white pine. — W. H. Rankin. 



1278. Reinking, Otto A. Fiji disease of cane. Facts about Sugar 12: 272-273. 1921. 

 [Reprinted from Sugar Central and Planters News (Manila) 1: 16-20. 1920.]— This article 

 includes a description of the Fiji disease of sugar cane and a warning as to the danger involved 

 in shipping cane from the Fiji Islands. — C. W. Edgerton. 



1279. South, F. W. Certain host plants of Fomes lignosus and Ustulina zonata. Agric. 

 Bull. Federated Malay States 8: 242-243. 1920 [1921].— Bamboos in a plantation of Hevea 

 brasiliensis showed infection with Fomes lignosus, and it appeared possible that the fungus 

 exists also upon tubers of sweet potato, Ipomoea Batatas. Ustulina zonata was found on 

 Areca catechu. — I. H. Bur kill. 



1280. Stone, R. E. The strawberry troubles of 1921. Canadian Hort. 44: 110-124. 

 1921. — Winter injury was very prevalent in the Niagara Peninsula, Ontario, due mainly to 

 late, hard frosts after growth had well started. Leaf spot {Mycosphaerella fragariae) and 

 leaf scorch (Mollisia earliana) were also destructive, due to weather favorable for the spread 

 of these diseases during April and May. Prevention and remedies include planting only 

 strong, vigorous sets on well drained soil, winter mulching, and spraying with Bordeaux 

 mixture. — E. F. Palmer. 



THE PATHOGENE (BIOLOGY; INFECTION PHENOMENA; DISPERSAL) 



1281. BuGNON, p. Sur un mode d'attaque et de contamination parasitaires des feuilles 

 de lierre (Hedera Helix L.) determine par la pluie. [On infection of leaves of the ivy determined 

 by rain.] Bull. Trimest. Soc. Mycol. France 36: 172-174. / fig. 1920.— Ivy leaves were 

 observed bearing diseased areas on the lower edges. The parasite appears to be Phyllosticta 

 hedericola. It is concluded that infection is brought about by rain water remaining on the 

 lower edges of the leaves and producing conditions favorable for germination of the spores and 

 infection of the host. It is suggested that if such is the case the configuration of the spots, 

 although mentioned in classical diagnoses, is of little value as a specific character. — D. S. 

 Welch. 



1282. Fraser, W. p., and D. L. Bailey. Biologic forms of wheat stem rust in western 

 Canada. Phytopathology 11 : 202. 1921. — Four distinct biologic forms of stem rust {Puccinia 

 graminis), identical with forms isolated by Stakman, have been found in western Canada. — 

 B. B. Higgins. 



1283. Newton, Margaret. Biologic forms of wheat stem rust in western Canada. 

 [Abstract.] Phytopathology 11: 202. 1921. — Five biologic forms of stem rust {Puccinia 

 graminis), identical with forms isolated by Stakman, have been found in western Canada. — 

 B. B. Higgins. 



