DISEASES OF PLANTS. 949 



the end nf tlir st-.-isoii it \v;is ruuiid lli.il llir tree rccciviiii: .". lbs. of sail did not 

 suffer al all Iroiii ,L,'imiiiK)sis and I lie oiirs rcrciviiiii 1 and 1' lbs. but slljilitly, 

 while the I'onrlh Ircc was severely injured, lost most ot its branches, and bore 

 little fruit as the result of the disease. It is idanued to continue these experi- 

 ments on ii large scale to determine the actual value of the treatment. 



Pear leaf blight (Natal A<ir. .lour, and Min. h'cc. !) ilium). No. 12, pi). 

 1 1 .IJ- 1 1 ,i7 . I'kjx. Ji).- — An account is given of i»e.ir leaf blight due to Eiitoino- 

 sporiiini iHUciilatinii. a fungus quite common in various parts of America and 

 Europe, hut which has only recently become ver.v ti'oublesome in South Africa. 

 The effect of the fungus on the host i)lant is described and directicms are given 

 for si)raying with Hordeaux mixtui'e and annnoniacal copi)er carbonate solutions. 



A new native host for pear blight, M. 1'.. Waitk (.1';x. /// ,s<-i(iicc. ii. srr., 

 :!.') (1007), Nu. GS.'i, PI). 280, 287). — In connection with investigations carried on 

 in California, the author reports having found that the pear blight organism 

 (lUicilliis aiujiloronis) attacks the California holly (HetcromeleH arbiitifolia). 

 This adds another host plant to llie list of those known to be subject to this 

 disease. 



Experiments on the control of black rot in Loire, L. Kougif.r (Rer. Vit., 

 27 (1907), No. UDJi, pp. iHin-S7 2) .—XUi'v describing tlie meteorological condi- 

 tions and the invasion of black rot in 1906, an account is given of experiments 

 made during the year f(jr the control of the disease. 



T'he vineyards were divided into ?> parts, one of which received f) applications 

 of acid copper acetate solution, another the same number of applications of 

 Bordeaux mixture, while the third was held as a check. -The acid solution of 

 copper acetate was formed by adding ^ liter of acetic acid to 1 kg. of neutral 

 copper acetate, and diluted with 1(J0 liters of water. The Bordeaux mixture 

 was composed of 2 kg. of copper sulphate and 1 of lime to 100 liters of water. 

 The first application of the fungicide was made May 23 and the last July 24. 



A careful examination was made of the foliage and grapes, and it was esti- 

 mated that there was a loss of 1 per cent where the vines were treated with 

 the copper acetate solution, 5 per cent where treated with Bordeaux mixtmv. 

 and 40 jier cent wlu-re no treatment was given. 



Some fungi of cacao trees, C. Spegazzini (Rev. Facult. Auroit. ij Vvt. La 

 I'lata, 2. Her., 2 (V.)or>), No. .'i-U. pp. 303-311, fi(/.s. .7). —Technical descriptions 

 are given of a number of ftmgi reported on cacao trees the presence of which 

 is considered detrimental to the growth of the trees. The species described are 

 Aiitliostdtiiclla IxUiiciisis. ('hipeoHpluvria ? theohromwola n. sp., Calospora f 

 iKihiriiKi.^ n. s]!., Luteinlrca baltieii.sln n. sp.. and UjiHteriopHii^ hra.'iilieiisis u. g. 

 and n. sp. 



Lecture on rubber diseases, E. E. (Jkkkn and T. Fetch (I'cnKleiiiiia Maii- 

 vahs, mod. No. 1, pp. 32-.'i.j). — Descriptions are given of a number of the more 

 conspicuous insect and fungus pests of rubber. Among the fungi reported are 

 Botryodiploilia cla-slinr. which occurs on the roots of Ilevea rubber, and I'oiiics 

 scniito.'^liis. which is iiuite destructive on the same species of rubber. This 

 fungus o(<\n's on the stiunps of (piite a nundxT of trees, from which it spreads 

 U) the llevea. and it is advised that all such stumps should be removed, as far 

 as possible, prior to planting. A discussion on this subject follows the presen- 

 tation of this iiai>er. 



A root disease of Hevea brasiliensis, T. Petch (Circs, and Afjr. Jour. Roy. 

 Hot. Gard. Ccj/loii, 3 (lUOG), No. 17, pp. 237-2i,2, pis. 2). — The author reports 

 the occurrence in one district of Ceylon of the root disease of Hevea brasilieii.'iis, 

 which Is caused by the fungus Fomcs semitosttis. This fungus attacks the 

 roots, and frequently associated' with it are white ants, but these are believed 

 to be secondary to the presence of the fungus. There appears to be no prelim- 



