454 EXPERIMENT STATION RECORD. 



the apple and pear, together with methods of treatment. Formulas and direc- 

 tions for preparing the standard fungicides are appended. 



Fire blight of pear and apple, H. S. Jackson {Oregon Sta. Circ. 7. pp. 16, 

 figs. 9). — This circular is a summary of the known facts compiled from various 

 sources concerning the characteristics, dissemination, and methods of control 

 of this disease. 



Frog-eye disease of apple leaves, J. L. Sheldon (Ahs. in Science, n. ser., 31 

 (1910), No. 803, p. 797). — The history, cause, and present distribution of a 

 disease of apple foliage, due to Illosporium malifoliorum, are given. 



Venturia inaequalis, ascospore dissemination and infection, E. Wallace 

 (Abs. in Science, n. ser., 31 (1910), No. 802, pp. 153, 75.)). — The life history of 

 V. incequalis, the cause of apple scab, is described. From the author's observa- 

 tions it seems that ascospore infection is largely responsible for early attacks 

 of scab on the leaves and petioles. An examination of leaves collected during 

 the latter part of the winter and early spring showed that the fungus was 

 present upon them and that from them inoculations were readily made. 



Life history of Melanops quercuum forma vitis, C. L. Shear (A6s. in 

 Science, n. ser., 31 (1910), No. 802, p. 7)8). — This fungus has been frequently 

 found in the ascogenous stage on the apple and a great many other trees and 

 shrubs but has generally been regarded as one and the same species. A variety 

 of names have been applied to it in its different stages, and the author has 

 conducted experiments to determine the relationship of its different phases. 



The cultures first produced pjcnidia of the Macrophoma or Dothiorella type, 

 but later spores were borne closely resembling Sphsropsis. The fungus is not 

 known at present to cause any serious injury to the grape, but the form on the 

 apple is said to cause the black rot, leaf spot, and canker. 



Parasitism of Coryneum foliicolum and Phoma mali, C. E. Lewis (Abs. in 

 Science, n. ser., 31 (1910), No. 802, p. 752), — A brief account is given of investi- 

 gations by the author which have been since published as a bulletin of the 

 Maine Station (E. S. R., 22, p. 547). 



A disease of fig trees (Jour. Bd. Agr. [London], 17 (1910). No. 1. pp. -J7- 

 49). — A description is given of Libertella ulcerala, a fungus that causes a dis- 

 ease of fig trees somewhat similar to that produced by the apple canker fungus 

 (Nectria ditissima). This disease seems to be one that has been known for a 

 considerable time in Great Britain, but has not been reported in other countries. 

 The fungus should be cut away from the wood and all affected parts burned, 

 the wounds being coated with tar. 



Bacterial blight of mulberry, E. F. Smith (Ahs. in Science, n. ser., 31 

 1910). No. 803, pp. 792-794). — -^ study has been made of the bacterial disease 

 of mulberries, which has been attributed to a species of Diplococcus and to 

 Bacterium mori. 



In 1905 the author isolated from blighting mulberry leaves two yellow organ- 

 isms, but inoculation experiments failed to show that they were the cause of 

 the trouble. In 190S the study was continued and the bulk of the bacteria found 

 in the fresh material proved to be a white species. Of this white organism 

 numerous successful infections have been made and the organism reobtained. 

 Independently two of the author's co-workers obtained similar results, and 

 there is believed to be no doubt that the infection is due to the white organism. 

 For this organism, which the author calls B. mori, an amended description is 

 given. 



Peach yellows and frost injury, M. B. Waite (Abs. in Science, n. ser., 31 

 (1910), No. 803, pp. 798, 799). — In the author's opinion there is no relation 

 whatever between winter injury and peach yellows, the latter being considered 

 a contagious disease, although the causal organism has never been ascertained. 



