1010] DISEASES OF PLANTS. 53 



liquid sulphur fungicide, such as lime-sulphur, with occasional applications of 

 Bordeaux mixture, will give fair control of both scale and scab. 



Fung-us diseases of tea, C. J. J. van Halt, (Dept. Landb., Nijv. en Handel 

 [Dutch East Indies], Medcd. Procfstat. Thcc, No. 58 (1918), pp. 26, 27).— The 

 author lists as causes of tea root diseases recently examined at the station 

 RoseUinia bothrinn (?), R. bunodes (?), RoseUinia sp., Vstulina sonata, Poria 

 hy point eritia, Hymenochaatc noxia, and Armillaria (?). 



Tea roots [diseases], II, A. C. Tunstall {Indian Tea Assoc. [Pamphlet] 1 

 (1918), pp. 17, pis. 7). — Besides a brief discussion of the general situation in 

 northeast India as regards tea diseases, which is said to be very satisfactory, par- 

 ticular diseases are dealt with in some detail, omitting some of those previously 

 mentioned (E. S. R., 37, p. 52) and including some not specifically mentioned 

 in the previous pamphlet, as RoseUinia bothrina and Sphocrostilbe repevs. 



Fungus diseases [of nursery stock in Kentucky], H. Gasman (Bicn. Rpt. 

 Bur. Agr., Labor, and Statis. Ky., 22 (1916-17), pp. 417-419).— In this portion 

 of an inspection report dealing also with insect pests and other matters, the 

 author lists, with brief comment, nursery twig blight (Bacillus amylovorus) , 

 crown gall of various fruits (Pseitdomonas tumefaciens), apple and crab apple 

 rust (Gymnosporangium macropus), mildew of apple and cherry (Podosphwra 

 oxyacanthw) , pear and apple blight (Bacillus amylovorus), pear leaf spot 

 (Scptoria pyricola), peach spot (Cladosporium carpophilum), plum black knot 

 (Ploicrightia morbosa), grape downy mildew (Plasmopara viticola), gooseberry 

 mildew (Sphwrothcca more-uva?) , rose mildew (S. pannosa), raspberry anthrac- 

 nose (Gloeosporium renctum), blackberry rust (Gymnoconia peckiana), white 

 pine blister rust (Cronartium ribicola or Peridermium strobi), and chestnut 

 bark disease (Diaporthe parasitica). 



Manual of tree diseases, W. H. Rankin (New York: The Macmillan Co., 

 1918, pp. XX +398, figs. 70). — The object of this book is to describe and suggest 

 means for the control of the diseases of forest, shade, and ornamental trees 

 that have been most studied. The general and specific diseases are treated 

 separately, the common diseases in the first four chapters, followed by the 

 specific diseases grouped alphabetically according to the common names of 

 their hosts. The diseases are arranged according to the part of the tree 

 affected, as leaf, twig, branch, trunk, and root diseases. The plan of the 

 book is to facilitate the diagnosis of tree diseases and, where control measures 

 are known, to state them. Unfortunately no means other than eradication is 

 known or is applicable to many diseases. 



Stem lesions caused by excessive heat, C. Hartley (Jour. Ayr. Research 

 [U. S.], 14 (1918), No. 13, pp. 595-604, fig. 1).—In a contribution from the Bu- 

 reau of Plant Industry, U. S. Department of Agriculture, a description is given 

 of white spot injury to pine seedlings noticed in the forest nursery in the 

 sand hills of Nebraska. This disease, which was previously described (E. S. 

 R., 30, p. 151), attacks very young seedlings, causing characteristic lesions which 

 have been termed white spot. The disease is distinct from the common dainping- 

 off disease, although it resembles it so closely as to be often confused with it. 



From a study of the lesions and their relation to insolation, to dry surface 

 soil, and to the production of typical lesions by artificial heating, the author 

 has been led to the conclusion that excessive heat is the cause of most of the 

 white spot trouble. Observations on the soil of seed beds have shown tempera- 

 tures well above 50° C, with reported maxima as high as 6S°. In addition 

 to young seedlings, older conifers ranging in age from several months to 

 several years have shown killing lesions which are attributed to the effect of 

 heat. 



