DISEASES OF PLANTS. 51 



l)l(>tinp: 111*' (loni(ii)strntioii of tlio rolationshi]) Iiolwoen tho two different forms of 

 the fuiif,'us. The author believ(>s it is very i)rol)al)le tliat a few viable uredo- 

 spores are rarried over tlie winter in tlie teleutosporic pustules and in this case 

 fiive rise to the infection of corn, and it is doubtless a fact that the rust is cur- 

 ried over from year to year in part by means of surviving uredospores. 



The curly top or western blight of the sugar beet, C. O. Townsk.m) {.\hs. 

 ill Sficiicf. II. scr.. .>.i {I'.Kiil). \ii. .is't. 1)1). .'i.>l'), .'i,>l). — An abstract is given of a 

 paiier iiy tlie autiior in w lii< li there was a discussion of various theories tliat 

 have been investigated as to the cause ol the curly top or western blight of the 

 sugar beet. These theories inc hided the action of jiarasites, unfavorable soil, 

 climatic, and cultural conditions, and inherent tendencies in the jdant toward 

 the disease. The liacteriai theory has heretofore received more attention than 

 others, but the results thus far seem to show that none of the organisms isolatinl 

 from diseased beets is the sole cause of curly top. In some instances parasitica 

 fungi have been found in the tissues, but inoculations made with the fungus in 

 healthy plants in the tield have not produced the disease under the conditions 

 employed. It is believed that a combination of unfavorable conditions is neces- 

 sary to produce tlie curly top, and the most important discovery thus far made in. 

 connection with the disease is that it does not usually attack beets in the same 

 locality or even in the same tield two years in succession. 



Some diseases of beans, II. II. Whetzel (A'eto York Cornell >St<t. Bui. 23'J. 

 pp. 197-21.'f, flys. 16). — This bulletin is largely compiled from previous publica- 

 tions of the New York State Station, the New Jersey Stations, and the Ontario 

 Agricultural College (E. S. R., 4, p. 557; 13, p. 4G6 ; 16, p. 477). The diseases 

 descriljed are the anthracnose due to CoUetotrichuin lindciiiiiilihiinnii, bacterial 

 blight caused by Bacterium plwseoU, and bean rust due to TJroinyccft appeinli- 

 cul(itii)'!. The nature of these diseases and methods of treatment are discussed, 

 the author contributing a numl)er of illustrations and notes on the life histories 

 of the organisms. 



Irish potato diseases, .1. P.. S. Norton (Maryland Sta. Bill. lOS. pp. 63-12. 

 fiys. Jf). — This bulletin is based on observations by the author and also publica- 

 tions of the New York State Station, the Vermont Station, and this Department. 

 The diseases described are scab. Rhizoctonia. dry rot, bacterial rot, and early 

 and late blight, and suggestions are given for their itrevention. 



Spraying notes, 1904-5, E. R. Bennett (Connecticut Storrs Sta. Bui. JfJ, 

 pp. -J.s'-O'.j. fi!i!<. S). — During the seasons 1903, 1904, and 1905, experiments were 

 carried on with P>ordeaux mixture fov the prevention of late blight of potatoes, 

 and the results obtained in the different years did not agree in all respects. In 

 1904 but little difference was noticed between the sprayed and unsprayed rows, 

 but the results in 1903 and 1905 showed that on the whole spraying is very 

 beneticial. 



In 1905 the experiments were continued to ascertain the least number of ai)pli- 

 cations of Bordeaux mixture that would be necessary to prevent loss from blight. 

 With this in view, different plats were sjirayed with fungicides and the check plat 

 was sprayed with Paris green to protect it from insects. One plat was sprayed 

 twice with Paris green, once with Paris green and Bordeaux mixture, and once 

 with Bordeaux mixture; a second similar area was given 7 sprayings, the first 

 and third having Paris green added to the mixture; and on still another plat 8 

 sprayings were given, the first 3 being of Bordeaux mixture and Paris green and 

 the last 5 Bordeaux mixture alone. The total yields per acre from the different 

 Iilats were as follows: Check plat 42.5 bu. ; plat No. 2, which received 2 spray- 

 ings of Paris green and 2 of Bordeaux mixture. 1S<| bu. : itlat 3. which received a 

 total of 7 sprayings, 270 bu. ; and plat 4, which received 8 spi-ayings, 315 bu. 

 per acre. 



