46 EXPERIMENT STATION RECORD, 



DISEASES OF PLANTS. 



Diseases of garden crops and their control, X. J. TJiddings (West TirgUna 

 Sta. Bui. 123, pp. 18, pis. 5). — This bulletin is one of a series of bulletins treat- 

 ing of practical questions in connection with the horticultural and trucking 

 industries of the State. It gives descriptions and methods of treatment of a 

 number of the diseases of the more common garden crops. The suggestions for 

 treatment, which are drawn from various sources, are those that experience 

 has shown to be the most efficient. 



Report of the plant pathologist, B. M. Duggak (Proc. Soc. Amer. Florists, 

 24 (1908), pp. 192-201). — The author describes in a popular way the more 

 common diseases of a number of ornamental plants and suggests methods of 

 control. 



Report of the entomologist and vegetable pathologist, H. Tkyon (Ann. 

 Rl)t. Dcpt. Agr. and Stock [Queensland], 1908-9, pp. 111-122).— This is a report 

 of work for the year ended June 30, 1909. 



Brief mention is made of the occurrence of insect pests of horticultural crops, 

 orchard crops and stock, and of diseases of field and garden crops, fruits, etc. 

 The most noteworthy event pertaining to the occurrence of plant diseases was 

 the discovery of the recent establishment of Phytophthora infestans in certain 

 of the potato-growing areas of the State. The occurrence of this fungus and the 

 nature of ])otato blight is considered at some length. 



A contribution to our knowledge of Uromyces pose, O. Juel (Svenslc Bot. 

 Tidskr., 2 (190S), Xo. 2, pp. 169-174, figs. 2; ahs. in Bot. Centhh, 111 (1909), Xo. 

 3, p. 58). — A review is given of the recent investigations on the group of Uro- 

 myces formerly included as one species under U. dacti/iuris, but now divided 

 into 4 well defined morphological and biological species, namely, U. dactylidis, 

 U. festuciv, U. rununcnii festucm, and V. pocc. The latter is divided by the 

 author into 9 different biological forms. 



Theoretical and practical control of Ustilago tritici and U. nuda, O. Appel 

 (Ber. Dent. Bot. GescII.. 21 (1909), 'So. 10, pp. 60 (!-6 10). —After a general dis- 

 cussion of the results with the various methods now in vogue for controlling the 

 grain smuts, the author states that in recent hot-water exiieriments conducted 

 l)y him with wheat and barley loose smuts, the best results were obtained by 

 soaking the seed from 4 to (! hours in water at a tenirierature of 20 to ,30° C, and 

 then treating with hot water at .''•O to .''>4° or with hot air at the same tempera- 

 ture for 20 to 25 minutes. 



The control of the loose smut of the barley, ,J. Sperling (lllus. Lundir. 

 Ztg., 30 (1910), No. 9, pp. 66, 67).— After a discussion of the value of hot water 

 and hot air treatments for loose smut of grains, the author concludes from ex- 

 periments on small plats and also on a field of more than 100 acres, that the 

 successful control of the barley loose smut is obtained by a four-hour soaking of 

 the barley at a temperature of 2,5° C. and a subsequent drying for .30 minutes in 

 a hot air apparatus in which the grain reaches a temperature of ."i.3 to ~t~>°. 



The susceptibility of different varieties of oats to Scolecotrichum, H. 

 Xilsson-Ehle (Ahs. in Bot. Ccntbh, 111 -(1909), Xo. 7, p. 16.',).— After dis- 

 cussing the effects that different types of soil, such as moorlands, lime soils, 

 etc., have on the disease, the author lists a number of varieties of oats common 

 to Sweden which are more or less resistant to the fungus. 



The influence of variety and temperature on stinking smut infection, L. 

 Hecke (Ztschr. Lmuhv. Versnchsiv. Osten:, 12 (1909), No. 2, pp. 49-66, 

 dgm. i ) .—Experiments were conducted with different varieties of wheat to 

 ascertain thei.- relative resistance to the snnit, and also with reference to the 

 influence of temperature on smut infection. 



