March, 1920] pathology 111 



The loss caused to the sugar industry is evidently not as great as in Porto Rico though no 

 reliable information is as yet available on this point. The presence of this disease possibly 

 explains the deterioration in some varieties of cane which has been noticed during the past 

 few years. The Japanese canes are immune to the disease. — C. W . Edgerlon. 



756. Elliott, John A. A smut on Iresine. Mycologia 11:87-88. Fig. 1-/,. 1919.— See 

 Bot. Absts. 3, Entry 712. 



757. Erwin, A. T. Tip burn. Potato Mag, l 9 : 8, 34. 2 fig. 1919.— Popular account of 

 a potato disease, regarding cause, appearance, control and varietal susceptibility. — Donald 

 Folsom. 



758. Farrell, J. Apple culture in Victoria. Jour. Dept. Agric. Victoria 17: 145-157. 

 PL 6. 1919. — A continuation of an article treating of apple diseases. For eradication of San 

 Jos6 scale hydrocyanic acid gas is stated to be the most effective and reliable agent. A 

 description of several fungus diseases is given and control measures are described. — J. J. 

 Skinner. 



759. Federal Horticultulal Board. U. S. Department of Agriculture. Quaran- 

 tine on account of black stem rust. Service and Regulatory Announcements 62. P. 58-59. 

 1919. — On and after May 1, 1919, no species or cultivated varieties of Berberis or species of 

 Mahonia may be shipped into the following states: Nebraska, Iowa, Illinois, Indiana, Ohio, 

 North Dakota, South Dakota, Minnesota, Montana, Wisconsin, Michigan, Wyoming, and 

 Colorado. These species have been largely eradicated from the states named. The purpose 

 is to prevent the spread of black stem rust of cereals caused by Puccinia graminis. — D. 

 Reddick. 



760. Felt, E. P. Insect galls and gall insects. Ottawa Nat. 32: J127-131. 16 fig. 1919. 



761. Fischer, E. Neueres uber die Rostkrankheiten der forstlich wichtigsten nadelhblzer 

 der Schweiz. [Recent information about important rusts of conifers of Switzerland.] Schweiz. 

 Zeitschr. Forstw. 49: 113-120. 1918— See Bot. Absts. 3, Entry 713. 



762. Fischer, Eduard. Die Publikationen iiber die Biologie der Uredineen im Jahre 

 1917. [Publications on the biology of rusts in 1917.] Zeitschr. Bot. 10: 389-395. 1918. 



763. Gaines, E. F. Comparative smut resistance of Washington wheats. Jour. Amer. 

 Soc. Agron. 10:218-222. 1918. — Stinking smut [T. laevis] is more abundant in the winter- 

 wheat section of Washington than anywhere else in TJ. S. A. It is not uncommon to find fields 

 with 40 per cent smut. — Seed of 13 varieties was inoculated heavily with spores and planted 

 in test rows. Turkey is the only highly resistant wheat of commercial importance in the list. 

 — It seems probable from the outcome of the tests that two distinct factors function in resist- 

 ance. One prevents infection, the other prevents smut-ball formation. If they do exist 

 there is a high degree of correlation between them. — D. Reddick. 



764. Gardner, Max William. The mode of dissemination of fungous and bacterial dis- 

 eases of plants. Rept. Michigan Acad. Sci. 20:357-423. 1918. — This phase of plant path- 

 ology is important, as attested by the extensive literature on the subject and by recent gov- 

 ernmental activities along the lines of quarantine. Not only the agents of dissemination, but 

 also adaptations of disease-producing organisms to these agents, are discussed. The text is 

 first presented in topical outline form and the literature is then reviewed following the scheme 

 presented in the outline. The natural agencies, most important in local spread, are air and 

 wind, water, insect and other animals. Man in commercial and other practices is responsible 

 for the dissemination of pathogenic bacteria and fungi over long distances. The list of ref- 

 erences to literature contains 220 titles. — L. R. Hester. 



