750 EXPEEIMENT STATION EECOED. 



A contribution to the life history and physiology of Cylindrosporium on 

 stone fruits, B. B. Higgins (Ahs. in Science, n. ser., 39 {1914), No. 998, p. 



258). A study of this fuiigns has brought to light an interesting condition of 



polymorphism. Four spore forms were found to be genetically connected in the 

 life cycle, and all of these except the microconidia, are capable of infecting the 

 host plants. 



From a study of the morphological and biological characters of the organism 

 from eight species of Prunus it is found that the forms fall naturally into three 

 species, each of which is present on one of three more or less distinct divisions 

 of the host genus. 



Some observations on the anatomy and other features of the black knot, 

 A. Stewart (AJ)S. in Science, n. ser., 39 (WU), No. 999, p. 291).— A description 

 is given of the changes induced in the wood of Prunus virginiana by the fungus 

 Ploiorightia morhosa. 



The normal wood of P. virginiana is said to contain usually rays from 1 to 4 

 cells wide in cross section. As a result of the stimulating action of the fungus 

 these rays become much broader, simulating the structure of compound rays. 

 The production of the usual elements of the xylem is greatly inhibited during 

 the first season's growth of the knot, but there is a correspondingly great pro- 

 duction of xylem parenchyma which is almost absent from normal wood. By a 

 further increase in the size of the parenchyma cells the knot is greatly enlarged 

 during the second season of its development. There is apparently no abnormal 

 growth in the outer portion of the bark and it is sloughed off just before the 

 conidia are produced. 



Peach leaf curl, A. J. Farley {'blew Jersey Stas. Girc. 29, pp. 3, pis. 2).— A 

 description is given of the peach leaf curl due to Exoascus deformans. For its 

 control the author recommends a thorough spraying with concentrated lime 

 sulphur before the buds open in the spring. Bordeaux mixture applied early in 

 the spring before the buds start, it is said, will also control leaf curl, but the 

 use of lime-sulphur mixture is preferred as it will control the San Jose scale 

 as well as the peach leaf curl. A solution of lime sulphur of not less than 1.03 

 sp. gr. is recommended for use. 



A disease of gooseberry new in France, E. Foex {Jour. 8oc. Nat. Hort. 

 France, 4. ser., 14 {1913), Dec, pp. 775-778; abs. in Jour. Agr. Prat., n. ser., 

 26 {1913), No. 49, pp. 717-719). — Briefly reviewing the appearance and the 

 history since 1900 of American gooseberry mildew { Splicer otheca mors-uvw) in 

 the British Isles and parts of Europe, the author states that among means found 

 effective in combating this disease are cutting and burning all affected parts, 

 turning the soil, and spraying in autumn with 3 per cent Bordeaux mixture and 

 in spring and summer with 0.2 or 0.3 per cent potassium sulphid. 



Cacao spraying trials, G. Auchinleck {Iinp. Dept. Agr. West Indies, Rpts. 

 Bat. Sta. [etc.'\ G-renada, 1912-13, pp. 4, 5). — Trials made in 1912 indicated 

 that epiphytic growths on trunks of cacao trees in wet districts could probably 

 be prevented for some years to come by 2 or 3 applications to the bark of a 

 solution consisting of 4 lbs. copper sulphate to 50 gal. of water. Use of Bor- 

 deaux mixture, 4 : 4 : 50, did not appear to be very profitable as used on fungus 

 diseases in Grenada, but the experiments were to be repeated in 1913. 



Keview of coffee diseases in Surinam, J. Kuyper {Dept. Landb. Suriname 

 Bui. 31 {1913), pp. 1-16, pis. 4). — This is a brief descriptive review of diseases 

 affecting coffee trees in Surinam since about 1900, among which are a root dis- 

 ease of undetermined cause; a silver thread disease said to be identical with a 

 disease noted in Porto Rico, but not with a thread disease somewhat similar in 



