646 EXPERIMENT STATION RECORD. 



A new method of combating' the enemies of plants, P. Broslavski {Selsk. 

 Khoz., 1909, Nos. 23-25; abs. in Zhur. Opuitn. Agron. (Russ, Jour. Expt. 

 Landtv.), 10 {1909), No. 5, pp. 683, 68-'f). — According to the author there are no 

 thoroughly I'eliable and convenient methods for combating the enemies of plants. 

 In his opinion the breeding and selection of resistant plants offers the best 

 method for preventing losses from insect and fungus pests. 



[Work in plant patholog-y], W. B. McCALLtJM {Arizona Sta. Rpt. 1909, pp. 

 583, 584)- — The work reported consisted mainly of studies of diseases due to 

 different forms of Fusarium. This involved studies on the methods of infec- 

 tion, life history, separation of the different forms, and simihir points. Among 

 the miscellaneous diseases noted were two rather serious diseases of alfalfa, 

 one due to crown gall {Urophlyctis (ilfalfw), and the other, which attacks the 

 stems, due to a species of Phoma. The late blight {Phytophihora infestans) 

 appeared on tomatoes, and this is believed to be the first time that it has been 

 observed in Arizona. The early blight {AUernaria solani) was quite serious in 

 some localities. A serious trouble of sugar beets, probably due to Rhizoctonia, 

 was observed, although it was associated with a species of Fusarium, and which 

 fungus was the primary cause of the disease could not ])e definitely determined. 



Report of the institute for plant protection in Hohenheim for the year 1909, 

 O. KiRCiiNER (Wiirttenib. Wchnhl. Landic, 1910, No. 22, pp. 350-357).— This is 

 a summary of the results of experiments conducted at this station during the 

 year 1909, mainly on the wintering of winter-sown grain, and on the insect and 

 fungus diseases of cereals, truck crops, grapes, orchai'd and forest trees, and 

 ornamental plants. 



Much attention was given to smuts and rusts, especially with reference to the 

 relative susceptibility of different varieties of grain to these diseases. 



Notes on insect and fungus pests {Jour. Bd. Agr. [London], 17 {1910), Xo. 

 3, pp. 215-217). — Among the pests noted are pear thrips, nematodes and clover 

 midge on clover, cun-ant black knot {Pioic right ia ribesia), corky scab {Spongos- 

 pora scabies), blackleg of potatoes, and cucumber and tomato canker {Mycos- 

 phwrella citruUina) on both seedlings and older plants. 



The genus Hendersonia, E. Voges {Bot. Zig., 1. Abi., 68 {1910), No. 5. pp. 

 S7-100, figs. 10). — This is a general discussion of the genus Hendersonia, includ- 

 ing its biological and morphological characteristics and methods of culture. 



On the significance of teleutospore formation on the Uredinese, O. Morgen- 

 THALEB {Centbl. Bakt. [eic], 2. Abt., 27 {1910), No. 1-3, pp. 73-92, figs. 18; 

 abs. in Arch. Sci. Phys. et Nat. [Geneva], 4. ser, 28 {1909), No. 11, pp. Ji89, 

 490; Bot. Centbl, 113 {1910), No. 17, p. .'///S).— After briefly noting the opinions 

 of various investigators on the significance of teleutospore formation, the 

 author gives the results of a number of infection experiments with Uromyces 

 veratri on Veratrum album, from which the conclusion is I'eached that the 

 formation of teleutospores, in this instance at least, is governed by the condi- 

 tion of the host plant. If it be in a young and vigorous condition uredospores 

 are produced. If, on the other hand, the leaves are injured, old or poorly 

 nurtured teleutospores are as a rule developed on them. 



Publications on the biology of the Uredineae for the year 1909, E. Fischer 

 {Ztschr. Bot., 2 {1910), No. 5, pp. 332-336) .—The author briefly discusses the 

 results of work done by various investigators on the cultural problems of the 

 Uredinefe. 



Experiments on grain smuts, O. Appel and E. Riehm {Mitt. E. Biol. Anst. 

 Land «. Forsiw., 1910, No. 10, pp. 7-11). — This is a further discussion (E. S. R., 

 23, p. 46) of the results of various experiments on the control of the loose smuts 

 of grain by the hot air and hot water treatments, in which the author sums up 

 the results as follows : 



