DISEASES OF PLANTS. 981 



eiif! pruni, E. deformnm, and E. cerad n]n)n iIhmi- liost plniits, and su<j<iesti()ny >^iven 

 for combatinjij their injnrious attack.*. 



Notes on a disease of lemons in Sicily, G. Bkio.si and 11. Faknkti {Separate 

 from Aiti lust. Bot. Unlr. J'aria, ..'. xrr., S {lUO.J), pp. 4)-—\ description i.s jriven of a 

 very serious disease of lemons that is known in Sicily as the white rust. A study of 

 the materials sent the authors led them to decide that the disease was due to an 

 undescribed species of Ovularia to wliich the name O. r'.ir'i is provisionally given. 

 The fungus is possibly related to and greatly resembles the ()(,xpnra Inialiinilu of 

 Saccardo. 



Diseased cocoanut palms {Acjr. News [Bdrhadon], ii {190S), JS'u. „'3, p. 67). — A 

 brief account is given of some diseases of the cocoanut palm, some of which have 

 been previously described i E. S. R., 14, p. ()71 ). 



Raspberry cane blight and raspberry yellows, V. C. Stewart and 11. .1. 

 Eustace [New York State Stu. Bid. 226, pp. Sol~.i66, ph. 6). — Preliminary to a com- 

 plete account of the disea.ses of the cultivated raspberries, blackberries, and dew- 

 berries, the authors describe a di.sease that has i)roved exceedingly destructive to the 

 raspberry. This disease, under the name caiie blight, was previously briefly men- 

 tioned (E. S. R., 13, p. 149) and appears to have escaped the attention of vegetable 

 pathologists. Their observations l)egun in 1899 were extended through subsei|uent 

 seasons and results of their studies are given in the bulletin. 



The cane blight attacks both red and black raspberries and occurs probably on the 

 dewberry, but so far as their observations go the 1)lackberry is exempt. The prin- 

 cipal damage is done to the fruiting canes, although the new sh<jots are attacked and 

 occasionally killed during the first season of their growth. The foliatre on the 

 affected canes wilts suddenly and becomes dry, involving either Ihc whole cane or 

 only a portion. It is most conspicuous about fruiting time, and canes loaded with 

 ripening fruit suddenly wilt and dry up. The disease does not spread from a center, 

 but canes here and there throughout the plantation are affected, and thrifty, well- 

 cared-for plantations appear to suffer as well as neglected ones. In general tlie dis- 

 ease is more destructive in old plantations, and the virulence seems to increase with 

 the age of the ])lants. 



The disease is of fungus origin, and is due to an imdetermined species of C'oniothy- 

 rium, closely related to if not identical with ('. fnrkelil. Inoculation exiteriments 

 have shown that the disease can l)e readily produced l)y inserting the spores of the 

 fungus, l)oth old and new canes yielding to the disease within 2 months after inocu- 

 lation. Investigations as to the time and manner of natural infection seem to indi- 

 cate that the new canes are attacked in the late summer or autunm, although there 

 is evidence that infection may occur on the fruiting canes early in the spring. The 

 fungus seems to gain entrance through wounds, i»articularly those produced by the 

 snowy tree-cricket ( (E<ruithus niveufi). 



During August and September the new canes of red raspberiies frequently show a 

 brownish or bluish-black coloration, extending more or less aroimd the canes. These 

 were supposed to represent the initial stage of the cane blight, but the authors' 

 investigations show that the discoloration is due to Sphnrella rnhiiia, a rather com- 

 mon fungus which is not of very great importance. Spraying experiments for the 

 prevention of the cane blight have proved futile, in one case the sjjraying apparently 

 increasing the disease. Preventive measures are suggested, by which the disease 

 may be kept in check, it being recommended that healthy plants be chosen, that 

 all diseased canes be removed, and the genera) health of the plants protected by 

 the use of fungicides. ' 



The Marlbonj red raspberry apparently is subject to a disease which js quite 

 destructive to that variety, although not confined entirely to it. This disease the 

 authors designate as raspberry yellows and the affecte<l plants have a stunted yel- 

 lowisli appearance suggestive of peach yellows and the Bermuda lily disease. On 



