750 EXPERIMENT STATION RECORD. 



Uredinales on Carex in North America, J. C. Abthue (Mycologia, 5 (1913), 

 No. Jj, pp. 240-2.'f4). — Continuing a previous communication (E. S. R., 26, p. 645), 

 the author states that " the purpose of this article is especially to call atten- 

 tion to the material being used for study." Also it is intended to " illustrate 

 some features of the method employed in preparing the manuscript for the 

 rust part of the North American Flora. ... It may also indicate to collectors 

 the desirability of including in rust collections such parts of the hosts as best 

 serve to permit of their independent verification or determination." 



It is stated that all Carex rusts belong to either the genus Nigredo or 

 Dicseoma. The material for the species under Nigredo was published about 

 a year ago. The Carex material for the genus Dicseoma is now being studied. 



Prevalence and prevention of stinking smut in Indiana, C. R. Obton 

 (Proc. Ind. Acad. Sci., 1911, pp. 3.^5-346).— The author states, as the result of 

 extensive inquiry, that this fungus, Tilletia fcetens, may be completely con- 

 trolled at a cost of about 0.5 ct. per bushel by careful application of the 

 formaldehyde treatment. The solution employed should be of 0.1 per cent 

 strength and the grain, after being thoroughly mixed therein, should be well 

 dried by spreading and stirring. 



Late blight of barley, A. L. Bakkk (Proc. lotva Acad. Set., 19 (1912), pp. 

 93-102, pis. S). — The author summarizes the results of a study of late blight 

 of barley substantially as follows : 



Helminthosporium teres, known in Europe since 1S81, was first discovered in 

 the United States in 1907 at Ames, Iowa, but was not destructive enough to 

 cause appreciable loss until the season of 1909. This fungus occurs upon barley 

 alone and can not grow on any other host. It causes the greatest destruction 

 through the formation of its conidia. Further than this, pycnidiospores and 

 sclerotia have been developed culturally, and in all probability perithecia, with 

 asci and ascospores develop from the sclerotia. Inoculation experiments verify 

 the view that the disease is transmitted largely by the seed, and that tempera- 

 ture and moisture play an important part in its development. Seed should 

 be sown when the temperature is sufficient to insure germination but low enough 

 to retard the growth of the fungus. The disease can be best checked by treat- 

 ing the seed with formaldehyde. Soil sanitation methods are important factors 

 in following out remedial measures. 



A bibliography is added. 



Prevention of bunt in wheat. — Esperiments with fungicides at Cowra 

 Experiment Farm, 1911—12, i\I. H. Reynolds (Agr. Gaz. N. 8. Wales, 2Jf 

 (1913), No. 6, pp. 461-476). — The results of these experiments may be sum- 

 marized as follows: 



The wheat tested in 1912 appeared less liable to bunt than that used in 1911. 

 Treatment with a 2 per cent solution of copper sulphate without subsequent 

 dipping in limewater or fresh water was very injurious to germination, as was 

 also the case with a solution of copper sulphate and salt and with formalin 

 solution in the proportion commonly used (1:400). The copper sulphate and 

 limewater treatment was found to be comparatively satisfactory in these experi- 

 ments, but fungusine had the minimum effect on the germination average for 

 the 2 years. Immersing the wheat in water 15 minutes prior to placing it in 

 0.25 per cent solution of copper sulphate for 10 minutes killed only 9.58 per cent 

 of the seed grain in 1912. The method of immersing the grain in fresh water 

 after treatment with copper sulphate did not prove to be very satisfactory and 

 was found to increase susceptibility to bunt. In 1912 a general reduction in 

 smut attack was noted in treated grain, formalin and scaleicide being the least 

 effective. In the combined treatment with copper sulphate and limewater, de- 

 laying the latter for 1 hour after applying the former reduced germination 24 



