448 EXPERIMENT STATION EECOED. 



Downy mildew and copper sprays, G. H£ron {Prog. Agr. et Vit. {Ed. VEst- 

 Centre), 35 {1914), No. 35, pp. 258-263). — The author gives some results of 

 practical experience in combating Perouospora in his own vineyard. 



Complete or combined treatments were found to be comparatively inexpensive 

 in comparison with the results obtained. Copper acetate and copper sulphate 

 may be used separately or together. High pressures applied to spraying fluids 

 sufficient to reduce the liquid practically to a fog are found to give more com- 

 plete access to all portions of both stocks and clusters than do lower pressures. 



Spraying in relation to flowering', L. Lebeun {Prog. Agr. et Vit. {Ed. VEst- 

 Centrc), 35 {1914), No. 23, pp. Ill, 112).— It is stated that in 1913 the injurious 

 effects of copper acetate used as spray on grapevines appeared to be accentuated 

 by the tender condition of the vines owing to their rapid growth and the 

 humidity prevalent at the time of flowering. 



Death of mulberry, L. Montemartini {Riv. Patol. Veg., 7 {1914), No. 3, pp. 

 65-74)- — ^ discussion, with bibliography, is given of a fatal disease appeai'ing 

 in a slow or rapid form In mulberry and receiving various local names in parts 

 of France and Italy. A systematic inquiry has been instituted among agri- 

 culturists in Lombardy and neighboring territory. 



Investigations in connection with, cacao root disease, A. J. Brooks {Bpt. 

 Agr. Dept. St. LuHa, 1913-14, p- 8). — Experiments are reported of an investiga- 

 tion on the Rosellinia disease of cacao, which show that the fungus can live 

 on large pieces of cut branches such as are found after pruning shade ti'ees in 

 cacao plantations. Lime trees planted in an infected area are also liable to 

 attacli from the fungus. 



Tests made of the fungicide known as " fungal " showed that it was without 

 effect in controlling the disease. From the present information it appears that 

 the only practical method of control is to surround the infected area with deep 

 isolation trenches, thoroughly liming the infected soil, and burning the diseased 

 wood on the spot. 



The mycoplasma theory of Eriksson, Gertkaud Haase-Bessell {Ber. Dent. 

 Bot. Gesell., 32 {1914), No. 6, pp. 393-403) .—The author reports having noted, 

 in case of Althcea rosea showing typical hollyhock rust not derived from the 

 so-called mycoplasm of Eriksson (E. S. R., 25, p. S50), the plentiful occurrence 

 of structures apparently corresponding to the secondary promycelia of that 

 author. 



A bibliography is appended. 



A new disease of chestnut, F. Cavara {Rw. Patol. Veg., 7 {1914), No. 1, pp. 

 1-5, figs. 2). — The author describes a disease affecting the lower portions of 

 young chestnut plants, as due to an organism found in connection therewith, 

 which receives the name Bacterium castanicolum n. sp. 



Bibliography of the chestnut bark disease, R. K. Beattie {Pcnn. Chestnut 

 Tree Blight Com. Rpt. 1913, pp. 97-122). — A bibliography of publications relat- 

 ing to the bark disease of chestnut to the end of 1913 is given, about 400 refer- 

 ences being included. 



A disease of pines caused by Cronartium pyriforme, G. G. Hedgcock and 

 W. H. Long {U. S. Dept. Agr. Bui. 247 {1915), pp. 20, pis. 2, fig. i).— The 

 authors give a detailed account of their investigations on the fungus C. py- 

 riforme, which causes a disease of pines and has for its alternate host plant 

 Comandra uvibellata. 



This fungus is widely distributed thi'oughout the United States and causes 

 considerable injury to different species of pines, being particularly injurious to 

 pines growing in nurseries. 



