1916] DISEASES OF PLANTS. 243 



capacity of the soil, together with a uniform supply of moisture throughout the 

 year, will prevent the injury. 



Under the heading of apple fruit spots and rots, the authors descrihe bitter 

 pit or dry rot, with which no organism has been definitely associated, Jonathan 

 fruit spot which is said to be a serious disease of the Spitzenberg and otlier 

 varieties, pink spot of Newtown apples, the cause of which has not been 

 definitely established, and apple-tree anthracnose as a fruit rot. In this case 

 the fungus has been definitely isolated and found to cause both forms of 

 disease. 



The mushroom root rot of apples and other trees is said to be quite serious 

 in parts of the Hood River Valley, attacking many varieties of orchai'd trees 

 and shrubs as well as garden plants. Satisfactory methods of control appar- 

 ently consist of thorough aeration of the soil about the trees. 



Contribution to the study of the parasitic fungi of Colombia, H. and P. 

 Sydow (In Voyage d' Exploration Scientifique en Colombie. Neuchdtel: Mem. 

 Sac. Neuchdtel. Sci. Nat., 191^, pp. 432-441, fig. 1). — This list contains the fungi 

 collected by Mayor exclusive of the Uredinese as noted on page 245. Of the 42 

 species listed, 11 are described as new. One of these is considered to represent 

 a new genus and has received the name Melanochlamys leucoptera. 



Parasites of cultivated plants in Arg'entina, L. Hauman-Meeck (Centbl. 

 Bakt. [efc], 2. Abt., 43 (1915), No. 14-16, pp. i2M5.)).— Besides a discussion 

 of diseases more or less important in Argentina, lists are given of local or more 

 extended causes of injury or diseases of plants, including bacteria, fungi, algse, 

 phanerogamic parasites, and Cuscuta ; also lists of such enemies attacking plants 

 according to their groupings as garden, forage, ornamental, industrial, orchard, 

 and forest plants. A bil)liography is appended. 



Report of the Institute for Phylopatholog'y in Wageningen in 1913, J. 

 KiTZEMA Bos (Aleded. Rijks Hoogere Land, Tuin en Boschbouwsch. [Wage7iin- 

 gen], 8 (1915), No. 5, pp. 249-338). — This report deals systematically in some 

 detail with phases of loss in plant industry due to causes of inorganic, parasitic, 

 physiological, or unknown character. 



Report on injuries and diseases of cultivated plants in the Rhine Province 

 in 1913, E. ScHAFFNiT and G. LtJSTNER (Veroffentl. Landw. Kammer Rhein- 

 prov., No. 3 (1915), pp. 69). — This contains reports from Bonn-Poppelsdorf and 

 Geisenheim separately, including, besides sections on the weather and unfavor- 

 able agencies nonparasitic in character, accounts of injury or losses due to 

 animals or to cryptogamic parasites attacking economic plants as systematically 

 discussed by classes. 



Diseases and enemies of cultivated plants in the Dutch East Indies in 

 1914, A. A. L. Rutgers (Dept. Landb., Nijv. en Handel [Dutch East Indies'^, 

 Meded. Lab. Plantenziekten, No. 15 (1915), pp. 45). — This discussion, besides 

 dealing with insect pests of agricultural plants, mentions as appearing here in 

 1914 for the first time rice smut (Tilletia horrida), Pestalozzia palmarum on 

 Hevea trunks, and a Diplodia attacking the roots of Hevea stumps. Under the 

 names of the various hosts, reports are given regarding diseases affecting a 

 considerable number of agricultural and other plants. 



Injury from smoke, late frost, frost drying-, and their diagnosis, F. W. 

 Neger (Tharand. Forstl. Jahrb., 66 (1915), No. 3, pp. 195-212, fig. i).— This is 

 an account of observations and experiments regarding leaf injury or loss as 

 related to such factors as light, heat, darkness, fungi, sulphur dioxid, hydro- 

 chloric acid, and mechanical injuries. 



The occurrence of sulphur dioxid injury to plants in the Selby smoke zone, 

 W. W. Jones (U. S. Dept. Int., Bur. Mines Bui. 98 (1915), pp. 398-427, pis. 5).— 

 This report deals mainly with the occurrence of sulphur dioxid injury and of 



