Pflanzenkrankheiten. 337 



Hungerford, C. W., Wintering of timothy rust in Wis- 

 consin. (Phytopathology. IV. p. 337—338. Aug. 1914.) 



Referring to Puccinia Phlei-pratenses. Trelease. 



Ingram, D. E., A twig blight of Quercus Prinus and related 

 species. (Journ. Agr. Res. I. p. 339—346. pl. 38. 7 textfig.Jan. 10, 



1914.) 



Hisplodia longispora is reported as a wound parasite killing young 

 trees and the twigs of older ones which may eventually die as the 

 result of such pruning. Trelease. 



Jamieson, C. O., Phoma destructiva, the cause of a fruit rot 

 of the tomato. (Journ. Agr. Res. IV. p. 1—20. pl. A and 1 — 6. 

 Apr. 15, 1915.) 



Phoma destructiva Plowr., causing spot-diseases of the leaves 

 of potato and tomato, is shown to be an active wound-parasite on 

 green and ripe tomato fruits. Trelease. 



Long, W. H., Three undescribed heart-rots ofhardwood 

 trees, especially of oak. (Journ. Agr. Res. I. p. 109 — 128. 

 pl. 7-8. Nov. 10, 1913.) 



An extensive analysis of heart-wood rots, of which the new 

 types are "a pocketed or piped rot caused by Polyporus Pilotae^\ 

 "a string and ray rot of oaks caused by Polyporus Berkeleyi''\ and 

 "a straw-colored rot of oaks caused by Polyporus frondosus". 



Trelease. 



Melehers, L. E., The plaster cast apple specimen. (Phyto- 

 pathology. IV. p. 113—114. 1914.) 



The different methods to preserve diseased specimens of apple , 

 pear, quince etc., so as to maintain the characteristic appearance 

 of the fungus and the natural color of the fruit are, according to 

 the writer's experience not satisfactory. A method with which the 

 writer has experimented and finally found entirely successful in 

 keeping specimens of apple affected with some of our common 

 diseases, is described in this paper. A spherical segment bearing 

 the fungus is cut from the apple. The pulp is carefully removed 

 by means of a scalpel. This is best accomplished by making criss- 

 cross cuts into the pulp, being careful not to puncture the skin. 

 It is then an easy matter to remove the pulp, as it comes out in 

 small pieces. All the flesh should be taken out and finally the inner 

 skin (collenchyma) should be lightly scraped to remove the last 

 fragments. When this has been accomplished, the mere Shell remains, 

 the apple skin and its diseased area. Then a soft paste (using water) 

 is made of plaster of Paris and this Alling is put into the mould 

 by means of a spatula. One should be careful not to allow the 

 plaster of Paris to come in contact with the surface of the segment 

 bearing the fungus, as it may prove difficult to remove. After the 

 skin mould is filled up level, the specimen is finished and should 

 be laid aside and allowed to set. This requires ten or fifteen minutes. 

 The skin adheres tightly to the cast and will not alter its shape. 

 The writer has specimens of scab, blotch, spot, spray injury etc., 



Botan. Centralblatt. Band 129, 1915, 22 



