DISEASES OF PLANTS. 849 



visible on both surfaces of Lbe leal'. A study of the fungus has shown that it 

 belongs to the genus Sphserella and the name S. caricce n. sp. is given it. 



Abnormal roots of figs, F. A. Wolf (Phytopathology, 3 {1013), No. 2, pp. 

 115-118, pi. 1). — A description is given of abnormal roots formed on the trunk 

 and larger branches of a tig tree in Alabama. 



Combating' anthracnose, E. Zaciiarewicz {Rev. Vit., 39 {1913), No. 1015, 

 p. 760). — The author states that powdered lime, cement, and rainei*al super- 

 jihosphate, in the proportions by weight of 2:1:1, applied three times at inter- 

 vals of 10 days, have generally been found sufficient to check the progress of 

 anthracnose on grapevines. 



Treatments of gray rot of grapes, A. Thouret and J. L. Vidal {Rev. Vit., 

 40 {1913), No. 1023, pp. in. ii8).— Formulas and directions are given for 

 making and applying various treatments for the control of Botrytis cinerca, 

 including both liquids and powders claimed to be adapted to various condi- 

 tions of weather, etc. Soap and gelatin are employed in some of the liquid 

 forms. 



Studies on grape diseases in 1912; attacks of black rot, J. Capus {Rev. Vit., 

 39 {1913), No. 1010, pp. 5Si-5S3).— This disease is said to be more widely ex- 

 tended than formerly, though not more severe at any given place. A detailed 

 account is given of the progress of infection. In the various outbreaks observed, 

 the author notes a progress and sequence similar to that of downy mildew and 

 the same correspondence with periods of rain and low temperature. 



Studies on grape diseases in 1912; the outbreaks of downy mildew in 

 Gironde, J. Capus {Rev. Vit., 39 {1913), No. 1009, pp. 5-J5-54S ) .—The author 

 gives details of observations made regarding mildew attack in 1912. 



Up to July 18 receptivity to the fungus was confined mainly to the very sus- 

 ceptible varieties, but after that time it became much more general, and con- 

 tinued prevalent during the summer. The conclusion is reached that during 

 the year in question both spores and external favoring conditions were present, 

 but that in the first half of the year most varieties seemed quite resistant. 

 After July IS the receptivity of the plants was much increased as regards some 

 portions of the vines, although the clusters were not seriou.sly attacked. 



Studies on grape diseases in 1912; attacks of downy mildew in Aude, 

 J. Capus {Rev. Vit., 39 {1913), No. 1011, pp. 613-618).— It is stated that the 

 progress of the mildew attack in the Department of Aude in 1912 was similar 

 to that in Gironde in years showing the same sequence of seasonal variation ; 

 that attacks of mildew and arrest of growth correspond to periods of low 

 temperature; and tyat the infection of the clusters coincides in time with that 

 of the leaves, but that the incubation period may be longer on the clusters than 

 on certain of the leaves. It is thought also that receptivity may appear in case 

 of the clusters and not of the leaves in some cases and vice versa. Lateness of 

 flowering, it is said, is generally associated with violence of mildew attack. 



Studies on grape diseases in 1912; experiments with a new method of 

 treatment for downy mildew, J. Capus (Rev. Vit., 39 {1913), No. 1013, pp. 

 6193-696). — The author reports that Burgundy mixture applied on both sides of 

 the leaves during June and July proved equally effective, but that in later 

 applications, its use on the lower surfaces seemed to give the better results. 

 It is held also that thorough application in the usual way (that is, reaching 

 the upper surfaces mostly) just before the time of infection will ordinarily 

 prevent serious damage. 



Studies on grape diseases in 1912; receptivity to mildew, J. Capus {Rev. 

 Vit., 39 {1913), No. lOU, pp. 720-72^).— As the result of studies during 1912 on 

 the receptivity of grapevines to mildew, the author states that a given variety 



