144 PATHOLOGY [BoT. Absts., Vol. IX, 



913. Heald, F. D. Relation of spore load to the per cent of stinking smut (Tilletia tritici). 

 [Abstract.] Phytopathology 11: 103-104. 1921. — The per cent produced is approximately 

 proportional to the number of smut spores per grain of wheat until the maximum is reached, 

 between 65,000 and 100,000 per grain. — B. B. Higgins. 



914. Heinricher, E. Arceuthobitmi Oyxcedri (DC.) M. Bieb auf Cupressus. [Arceu- 

 thobium Oxycedri (DC.) M, Bieb on Cupressus.] Ber. Deutsch. Bot. Ges. 38: 220-223. 1920. 

 — This paper is a report of experiments carried out with the intention of testing the ability 

 of the organism named to attack Pinus silvestris, Cupressus pendula, and Chamaecyparis 

 pisifera. Positive results were secured with Cupressus spp. only. Since only 1 out of 67 seeds 

 sown on the cypress developed into a plant on that host the author does not consider the nega- 

 tive results with Chamaecyparis as conclusive evidence of the parasite's inability to use the 

 latter as a host. — R. M. Holman. 



915. Morse, W. J. The transference of the potato late blight by insects. Phytopathology 

 11: 94-96. 1921. — A case is noted where the spores of the potato late blight fungus {Phy- 

 tophthora infestans) were apparently carried 150 yards by flea beetles (Epitrix cucumeris). — 

 B. B. Higgins. 



DESCRIPTIVE PLANT PATHOLOGY 



916. Anonymous. Degeneracion de la papa y manera de evitarla. [Degeneration of the 

 potato and means of preventing it.] Rev. Agric. [Mexico] 4: 415-421. 6 fig. 1919. — Degenera- 

 tion of potato varieties is due partly to Phytophthora infestans and other fungi and partly 

 to unknown causes. The tendency of certain varieties toward degeneration, expressed by 

 low yields, spindling sprouts and related phenomena, is often allied with smooth, shallow- 

 eyed tubers. A lack of diastase in tlie tubers and poor fibro-vascular development also mark 

 this condition. — John A. Stevenson. 



917. Anonymotjs. Report on Pe-byu-gale disease and the application of measures to check 

 its spread, 1918-19. Appendix to Ann. Kept. Agric. Sta., Agric. Chem., Agric. Eng., Asst. 

 Bot. Northern Circle, and Asst. Entomol. Burma 1918-1919: 95-99. 1 map. 1920.— This is 

 a sclerotial disease on Pe-byu-gale (Phaseolus lunatus L.) reported as exceedingly destructive 

 over localized areas near Mandalay, Burma. Despite burning badly infected fields, and rota- 

 tion of crops, the disease is spreading. [See also Bot. Absts. 9, Entry 941.] — Winfield Dudgeon. 



918. Barss, H. p. Bean blight and bean mosaic. Oregon Agric. Exp. Sta. Crop Pest 

 and Hort. Rept. 3: 192-196. Fig. 56-59. 1921. — Notes and recommendations are given rela- 

 tive to the occurrence and control of blight, probably caused by Bacterium phaseoli, and of 

 mosaic. The variety Berrendo from Mexico shows no symptoms of mosaic even when arti- 

 ficially inoculated, yet after inoculation it may transmit the disease to other varieties. — 

 E. J. Kraus. 



919. Barss, H. P. Physiological disorders of developing fruits. Oregon Agric. Exp. 

 Sta. Crop Pest and Hort. Rept. 3: 159-166. Fig. U-47. 1921.— The following are assumed 

 to be due to a lack of adjustment between water needs and water supply: (1) Shriveling of 

 grapes; (2) drouth spot, cork, blister, punk, and bitter pit of apple; (3) black end of pears 

 and of walnuts; (4) gum spot of prunes; and (5) internal browning of potato. — E. J. Kraus. 



920. Bianchi, Angel T. Enfermedades de la papa. [Potato diseases.] Defensa Agric. 

 [Uruguay] 2: 31-32. 1921. — Phytophthora infestans, Fusariutn solani (dry rot), and Bacillus 

 amylobacter (wet rot) are considered. — John A. Stevenson. 



921. Bryon, May K. A bacterial budrot of cannas. Jour. Agric. Res. 2V: 143-152. 

 PI. 31-38. 1921. — The disease is essentially one of young tissue and moist conditions in Canna 

 indica. The lesions vary from small spots to brown irregular areas extending several cen- 

 timeters along the leaf blade. Young shoots are often killed, the flower buds blighted, and 



