DI8EA8ES 01? PLANT8. 56*3 



The fungus produces upon the leaves and Leaf sheaths minute, scattered, pale- 

 spots, which increase in number and size, and the Leaf gradually changes to a sickly 

 yellowish-green color, after which jt ceases to grow. The plants attacked are 

 checked in their development, and in bad cases the crop dries up without producing 

 more than a small percentage of well-developed heads. 



In addition to the hosts mentioned the fungus has been observed on wild barley, 

 and it probably occurs on a number of wild grasses, from which it may pass to culti- 

 vated oats and barley. It is thought probable thai the fungus may be conveyed by 

 Beed, and treatment with fungicides or hot water is recommended. 



A preliminary note on clover diseases in Tennessee, 8. M . Bain and 8. H. 

 Essary [Science, n. %er., .'- [1905), No. 564, /'■ 50S).—A preliminary report Le given 

 of investigations carrie<l on at the Tennessee Station to ascertain the cause of several 

 diseases of clover. In the vicinity of Knoxville this crop begins to die in the sum- 

 mer following late winter sowing, and the trouble has been popularly attributed 

 to some condition of the soil. The author-' investigations have shown that the 

 malady is independent of soil conditions, but is principally due to a specific fungus. 



Early in the season the clover rust | Uromyces trifolii) and Pseudopeziza trifolii were 

 both noticed upon clover, but were of comparatively little importance. A more 

 destructive disease is that caused by Mdcrosporium sarcinaeforme. This fungus 

 attacks alsike clover as well as the red, and appears capable of destroying the plants 

 without assistance from any other parasite. The most destructive disease thus far 

 observed is due to an undescribed species of Colletotrichum. In general appear- 

 ance this disease is said to resemble the anthracnose of clover, which has been 

 attributed to Glceospori" m caulivorum I E. S. R.,14, pp. 159, 77:; . 



The Colletotrichum referred to causes considerable injury to young clover plants 

 in early summer, where it confines its attacks to the petioles of the leaves. The 

 greatest damage, however, is said to be to the blooming and fruiting plants, which 

 are attacked most frequently just below the flowerheads, but sometimes at other 

 points causing the blackening and death of a limited region, eventually destroying 

 the entire plant. 



The details of the investigations are to be published in a bulletin of the Tennessee 

 Station. 



Diseases of tobacco, M. T. Cook and \V. T. Horne (Estac. Cent. Agron. Cuba 

 Bui. 1, pp. 17-22, figs. 4). — Descriptions are given of a disease of tobacco in the seed 

 bed due to Khizoctonia sp., the mosaic disease, the leaf spot caused by Cercospora 

 Yticotianse, some curing house troubles, and the occurrence of a broom rape - 

 bancfo ramom) in tobacco fields. Fungus diseases so far have not seriously threat- 

 ened the crop in Cuba, hut the author thinks best to describe those enumerated 

 above, and suggests methods for their prevention. 



The duration, of Gymnosporang-ium and its relation to rusts, E. Piullieux 

 | Wul. Soc. Sat. Ayr. France, 65 ( 1905 I, No. 6, pp. 464-479). — In investigating some of 

 the hetercecious rusts the author has studied the phenomena relating to the Gymno- 

 sporangimn on junipers and its Ivestelia stage or rust <>n pears and ornamental 

 haw thorns. 



All trees and shrubs carrying the so-called cedar apples should be CUl 0U< when in 

 the vicinity of pears, apples, haw thorns, and similar plant-. The < rymnosporangium 

 is perennial in the tissues of various species of juniper, and it is known to persist for 

 4 to 8 years in the common juniper and L2 or more year- in Juniperus sabina. The 

 presence of either of these species of shrubs make- combating the rust on the pear 

 and other economic plants all the more difficult. 



The black spot, or scab, of the apple and pear, C. 1\ Lounbbubv | Agr. Jour. 

 Gape Good Hope, 27 (1905), A"-. .'. pp. f 00-27-*).— Notes are given on the occurrence 

 of the black spot, or scab, due to Fusicladium dendriticum and /•'. pyrinum. The dis- 

 tribution and amount of injury caused by these fungi throughout Australia ia shown, 



