DTSEAi^ES OF PLANTS. 649 



188, pis. 2, figs. 5). — A study is rcpoiicd of the disease of ni)ples called bla-k 

 i-ot that is due to tlie fuufius Srlfmtiiiid fnictniciKi. Apitics affeeted by this 

 form of the disease are Itlack and siiiiiy and ai-c ortcii reduced to muuuny fruits 

 of unusual a])i)earaiice. The shiiiiiii,' black color of the ai)i)le is confined to the 

 skin, .the llcsh Itclow licin^' llie usual brown coloi- characteristic of Monilia 

 diseases. 



The author cultivated the funj^Mis on apides. jiears. aiijile pomace. j;elatin, etc., 

 and desci'ibes the growth ol)tained. It was found that lifilit and temperature 

 were important factors in detei-mining the development of the funjjus. The 

 character of the substratum on which the fundus ^I'ew was also an intluencins; 

 factor, the skin of the ap])le appearing to retard the fructification to a consid- 

 erable degree. In all the ai)ples inoculated with cultures of the fungus the 

 black rot developed after a time, although the fungus remained sterile. Low 

 temjteratures and deficiency of light were also found to induce sterility. 



Melanose, Cladosporium, and Septosporium, P. Marsais (Rev. Vlt., 26 

 (11)06), \o. 677. /tp- 621-623. pi. 1). — Brief notes are given on diseases of grapes 

 caused by Hcptorui aiiiprliiiu, Cladosporium vltlcolum, and Scptosporlniii fiicJcelll. 

 These diseases ordinarily make their api)earance so late in the growth of the 

 vine that they occasion but little injury, but when these fungi attack the youug 

 leaves the use of fungicides. i)articularly those <*ontaining copper, is recoin- 

 niended. 



Notes on the disease of grapes known as roncet, S. Ercoi.e ( liol. Jffic. Miii. 

 Agr., Indus, c Com. [Rome], 6 (1906), \o. J. pp. .373-381, figs. 3).— The author 

 reviews the various hypotheses regarding the cause of this disease, not arriving 

 at an.v definite conclusion concerning them. Certain stocks seem quite resistant 

 to roncet, and the author recommends their use in the vineyard. The most 

 resi.stant stocks are American varieties or some of their hybrids, and b.v plant- 

 ing these and following more careful cultural methods, it is claimed that losses 

 due to the disease may be greatly lessened. 



Notes on folletage of the grape, L. Ravaz {Prog. Agr. et Vlt,. (Ed. rEst), 27 

 (l!)0()). Xo. .'lU. pp. (I'.l0-i;'.)2) . — In a note upon the occurrence of this disease in 

 Asiatic Turkey the author calls attention to t-he in'obabillty that it is due to a 

 species of Polyporus. which seems to l>e /'. hiiilarlus. While the evidence seems 

 clear that the dise.-ise is due to this fungus, it has not yet been demonstratiHl 

 experimentally. 



The American gooseberry mildew, E. S. Salmon {Jour. Roy. Tlort. 8oc. 

 \ Loudon]. 31 {ni06). pp. 128-l.n. map /(.—The author traces the spread of the 

 .Vnierican gooseberry mildew {><pharothcca mors-uvw) throughout Europe and 

 suggests the need of legislation to combat its furthei- dissemination. 



The means employed to combat the American gooseberry mildew in Sweden, 

 J. Eriksson {.Jour. Rog. Hort. ,S'oc. [Loudon]. 31 {1906). pp. 138-1.'/1). — .Vtten- 

 tion is called to the destructive nature of the gooseberry mildew (t^pliarotJicca 

 mor.'i-uv(r) ou European varieties of gooseberries, and means that have been 

 employed in SwiNlen for combating the disease are described. These include 

 insi)ecti<)n of nurseries, the destruction of badly diseased plants, cutting out 

 of infected portions of plants, and spraying with potassium sulphid. 



Investigations on the bacteriosis of figs, L. Petri (.1/^/ 7?. Arcad. Lliiccl, 

 Rend. CI. ticl. Fls., Mat. r Xat., .'>. scr., l.j (1906). II. No. 10. pp. C, ',.',-().'> I . figs. 

 .?). — An account is given of a bacterial disease of fig trees wliich was formerly 

 reported by F. Cavara as due to Bacterium ficl. 



The author in the study reported isolated the organism, cultivated it in 

 various media, and successfully produced the disease through inociilation 

 experiments. The cultural characteristics of the organism are described at 



