DISEASES OF PLANTS. 957 



Inocnliition experiiiioiits were tjinicd on which seom to indicate that the fun- 

 jrus is readily transferred to cane, and all indications point to the conclusion 

 that this species gains entrance only after the outside cells of the attacked por- 

 tion of the cane plant have been killed. The killing is believed to be accom- 

 plished through some physiological :ic(ivity of the parasite. 



Some parasites of citrus, rubber, tea, royal palm trees, etc., C. Bernard 

 (Bill Dcpt. Agr. Iitdcs Xecrlaitd, J907, No. 11, pp. 55, pLs. J).— Descriptions 

 are given of a number of fungi which are associated with the sooty mold of 

 citrus, Castilloa rubber, coffee, and guava trees, CUipnodium steUatum and C. 

 guajavcr being described as new species. Among the parasites of tea, SfllbcUa 

 Ihew and Ilehnintliosporium thew are characterized as new species. An account 

 is given of Pcstalozzia palmarum on the royal palm, Nectria hogoriensis n. sp. 

 on vanilla, and Ramnularia nndulata u. sp. on the leaves of citrus trees. The 

 new species are technically described. 



In addition to the fungi, the author notes the occurrence of a species of 

 Tetrauychus on tea and Phytoptus on species of papayas, tomatoes, etc. 



Suggestions are given for the control of these parasites, so far as definite 

 means are known. 



The Hemileia disease of coffee, J. Buis {L'Hcmilcia et rAvenir du Cafeier 

 a Madagascar et a la Itennion. Paris, 1907, pp. 1-2^, figs. 2). — A description is 

 given of the disease of coffee trees due to the fungus Hemileia vastatrix, with 

 suggestions for its control. The means suggested include the collection and 

 destruction of infested leaves, the use of fungicides, the selection of relatively 

 cool and dry localities for coffee plantations, the use of resistant varieties and 

 races of coffee, and better cultivation of plantations. The Arabian coffee seems 

 most subject to this disease, and Liberian, Kongo, and certain Java and other 

 hybrids are quite resistant. 



An important gap exists in our knowledge regarding this fungus, and the 

 author suggests concerted studies on its life history to determine the host 

 plants of its alternate generations. A knowledge of the intermediate hosts, it is 

 believed, would be of advantage in combating the disease. 



A disease of coffee, G. Delacroix {Agr. Prat. Pays Chauds, S (190S), No. 

 5.S, pp. 6(1-78, pis. 2). — The author describes a disease of liiberian coffee due 

 to the alga CephaUuros rircscens. It is said to be associated with a fungus 

 forming a lichen probably belonging to the genus Strigula. 



Spraying with Bordeaux mixture having given good results in controlling 

 this pest on tea, the author advises the use of this fungicide on coffee when the 

 parasite is abundant. 



A disease of birch catkins, F. W. Neger (Ber. Dent. Bot. Gcsell., 25 (1907), 

 Xo. 7, pp. 368-372, pg. 1). — The author describes a disease of the female catkins 

 of birch, which causes a portion or all of the catkin to turn brown, the ui)per 

 half in some instances retaining its original green color. The disease has been 

 rather destructive, and a study of its causes seems to indicate that it is due to 

 a species of Botrytis. (jomi)arisons are drawn between this organism and 

 Hclerotinia hctulcc, which has been described as occurring on the catkins, and 

 the author also compares it with S. corijli, a leaf disease of related plants. In 

 no instance is he convinced of the identity, although it appears to be ujost 

 nearly related to Botri/tis cinerca. 



Two diseases of poplar trees, E. Haignault (Jardin, 21 (1907), No. .'/93, pp. 

 26'i, 265). — For a number of years the Lonibardy poi)lars in the vicinity of 

 Paris have, according to the author, been attacked by fungus di.seases, which 

 render their culture difficult and in some i)laces almost impossible. Tliese 

 diseases are caused by the fungi Napicladium tremulw and Tuphrina aiirea. 



