DISEASES OF PLANTS. 245 



together with notes on winterkilling, snow-traps, and wind-breaks, and on the 

 evergreens in the Black Hills. 



Descriptions are given of the varieties of evergreens recommended for plant- 

 ing in South Dakota and a large number of forms are illustrated. 



Quinin, camphor, and ipecac, F. J. Rosa (Bol. Soc. Geogr. Lisboa, 25. ser., 

 1901, xYo.s'. 2. pp. 89-96: J/, pp. 151-161). — Historical notes are given with refer- 

 ence to the introduction and cultivation of quinin, camphor, and ipecac in the 

 different countries of the world. 



Model shade-tree work {Woodland and Roadside, 6 {1901), No. /f, pp. 40-42, 

 dym. 1 ) . — The sliade trees of Newark, N. J., on all public ways and in city 

 parks are under the care of a shade-tree commission, invested with the power 

 to make and enforce regulations. The text is here given of the notice sent to 

 abutting property owners, preliminary to planting operations, and sets forth 

 the methods of the commission. A graphical diagram is also given of the uni- 

 form speciflcatious adopted as to methods of planting. 



DISEASES OF PLANTS. 



Report of the botanist, G. E. Stone and N. F. Monahan {Massachusetts Sta. 

 Rpt.. 1906, pp. 151-190, pis. 2). — A brief outline is given of the work carried 

 on by the station during the past year, followed by notes on a number of specific 

 investigations. 



Among these attention is called to a bacterial disease of cucumbers which has 

 hitherto been rare on cucumbers grown under glass in Massachusetts. In the 

 attack noted the authors believe that the conditions under which the crop was 

 grown had considerable to do with the susceptibility to infection. 



A bacterial disease of lettuce is briefly described, the object of presenting the 

 account being to call attention to the disease, as it is reported to be causing 

 considerable damage in numerous parts of the country. The disease results in 

 the appearance of numerous small brownish spots on the young and tender 

 leaves of the head. The spots are frequently quite abundant and in some cases 

 i-un together, causing the destruction of a portion of the leaves. 



A bacterial disease of geraniums, previously noted (E. S. R., 10, p. 648), has 

 been observed every year since 1898. At times this disease becomes quite de- 

 structive and, from the authors' observations, is more troublesome on plants 

 exposed to bright sunshine than upon those growing in partial shade. 



Attention is called to some tobacco troubles experienced in the Connecticut 

 Valley, particularly one which appears to be caused by improper methods of fer- 

 tilization and culture. In this case the roots of the plants exhibited character- 

 istic burning, and as there appeared to be no inclination to spread from the 

 infected centers, the trouble is believed to be due to the injudicious use of fer- 

 tilizers. 



The authors state that for a number of years peach twigs showing grayish 

 colored spots with purple margins have been received at the laboratory. An 

 examination of these showed the preseOjCe of a species of Monilia, but it was 

 invariably a different species from that known to occur on the fruit. Further 

 investigations will be made to determine the effect of treatment for the San Jose 

 scale on the development of this disease. In connection with this and other dis- 

 eases the authors state that the use of lime-sulphur mixture for the prevention 

 of the San .lose scale has pi'oved decidedly beneficial in reducing the amount of 

 canker, pear blight, black knot, and other diseases. 



A series of potato-spraying experiments is reported in which comparisons 

 were made between standard Bordeaux mixture, dry Bordeaux, copper phos- 

 phate, and a mixture designated as 1-2-3, which is said to contain compounds 



