DISEASES OF PLANTS. 753 



Tho lilnok honrt or core I'ot dftsci'ibod is said to ho duo to a species of Peui- 

 cilliimi wliii-h attacks the fruit, the first indication of wliich is sliowu in the 

 discoloration of certain s«'ginents \Ahich remain pale green while the rest of the 

 fruit assumes the characteristic color of the ripening fruit. Sections tlirough 

 these diseased areas show blaclc patches in the pulp, and these may spread until 

 more or less of the fruit is involved. It appears that the fungus makes entrance 

 to the fruit through injuries and probablj- through punctures made by the 

 mealy bug and species of mites. 



A disease of shipped or stored pineapples described is thought to be caused 

 by Trh-liosphwrki sacchari, and a second disease is attributed to Diplodia sp. 

 In addition species of Penicillinm and Aspergillus are frequently found on 

 pineapples attacked by the other fungi. 



In conclusion an account is given of the investigations of Cobb on pineapple 

 diseases which have been noted elsewhere (E. S. R., 19, p. 154). 



Diseases of coffee trees, G. Delacroix (Agr. Prat. Pays Chauds, 7 {1901), 

 A'o. J6', in). 41^-4~3, pi. 1). — Descriptions are given of the canker of the coffee 

 tree, which is attributed to Rostrella coffcw, a disease common in .Java which 

 is due to Corticium javanicum, a root rot of the trees, caused by Armillaria 

 mcllca. and a number of other obscure diseases. 



Cephaleuros virescens, the red rust of tea^ H. H. Mann and C. M. Hutchin- 

 son {Mem. Dcpt. Ayr. India, Bot. Her., I {IDOT), No. 6, pp. 35, pis. 8, figs. 2).— 

 The author states that algfe seldom do serious damage to economic plants, but 

 attention is called to the red rust of tea caused by the alga C. virescens. This 

 disease is distributed over a considerable portion of Assam, where it seems to 

 occur locally and sometimes quite destructively. A description is given of the 

 parasite, its method of reproduction and attack on the host plant, and a dis- 

 cussion of the causes of susceptibility to the disease. 



The alga occurs on the tea leaves and shoots and on the seed coats. It ap- 

 pears to be the most serious trouble to which the tea plant is subject, and for 

 its control the author suggests careful attention to pruning and spraying with 

 Bordeaux mixture. As certain trees that grow almost everywhex'e in India are 

 especially subject to attack, these should be removed from the vicinity of tea 

 gardens so far as possible. 



American gooseberry mildew {Jour. Bd. Agr. [London], I4 {1907), No. 9, 

 pp. 5'/'/-5.70. /)/. /). — A description is given of the gooseberry mildew caused by 

 tiphwrotheca mors-ura\ and a brief account presented of the life history of the 

 fungus. Suggestions are made as to precautions against its introduction, the 

 treatment of suspected and infected bushes, etc. 



The distribution of the American gooseberry mildew in Germany and its 

 control, II. ScHANDER {Dcut. Obsthau Ztg., 1907, No. 23, pp. 853-357).— A de- 

 scription is given of the gooseberry mildew caused by Sphwrotheca mors-uvw, 

 and attention called to its distribution throughout Germany. 



For the control of this diseiise the author recommends spraying with potas- 

 sium suli»hid solution, the information l)eing based very largely upon experi- 

 ments carried on at the N(nv York State Station (E. S. E., 11, p. 94.'')). 



Experiments on the control of grape downy mildew, B. Tomei {Staz. 8pcr. 

 Agr. lua., J,0 {1907), No. J,-5, pp. 371-390, figs. 3).— An account is given of 

 experiments made during 1906 for the control of the downy mildew of grapes. 

 Spraying experiments in three vineyards were carried on in which different 

 fungicides were tested, among them, Bordeaux mixture made by different for- 

 mulas, a fungicide in which equal parts of sulphate of copper and suli)hate of 

 iron were used in connection with lime, and a proprietary fungicide, the prin- 

 cipal constituent of which is acetate of copper. 



