ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 715 



with Spluerotheca pannosa. The growth of the fungus is not vigorous, 

 and it is suggested that the fungus is not fully adapted to its host. 



The fungous diseases of Indiana for the year 1906 on fruits, 

 vegetables, and cereals are reported on by F. D. Kern.* Notes are 

 given on the control of plant diseases. 



Three leaflets issued by the Board of Agriculturef deal respectively 

 with Rhytisma acerinum on sycamore, which can be stamped out by 

 destroying the fallen leaves ; with Nedria Solani, the winter rot of 

 potiitoes ; and with Fseudomonus campestris, a bacillar disease which 

 attacks cruciferous plants, and does great damage to cabbages and 

 turnips. Advice is given as to the treatment of these diseases. 



W. Busse| publishes the I'eport of the pathological expedition to 

 Cameroon and Togo. Insects as well as fungi are included among the 

 plant parasites ; among the latter were Phi/tojjhthora on cocoa-trees, and 

 Uredo Gossypii on cotton. 



A disease of maples in Vienna has been determined by F. von 

 Hohnel§ to be caused by a resupinate Polypore, Porta ohliqua. It 

 develops under the thick bark, and after throwing this off, spreads widely 

 on the naked wood. The writer suggests that possibly the mycelium 

 lives in the cambium without killing it ; it is perennial although the 

 fruiting body is annual, and falls to the ground when it reaches the 

 surface and dries up. 



The gooseberry and currant disease caused by Glffosporium Ribis, has 

 been experimented on by Ewerts, of Proskaw. || He made a large series 

 of culture and infection experiments, as well as tests for the best methods 

 of treating the disease. He does not find that the mycelium winters in 

 the host-plant ; he rather concludes that the conidia retain their powel' 

 of infection till the following season. Bushes are not attacked until 

 they have grown for some time. The most susceptible time for infection 

 is the month of May, and at that date the bushes should be sprayed with 

 Bordeaux mixture. The treatment has had very good results. 



A. RantlT gives a description of the effects of gummosis in the 

 Amygdalaceffi. He descril)es the effect on the tissues. The organisms 

 that are found in the wounds, and that either cause or increase the 

 trouble, are bacteria, fungi, and insects. Glasterosporium carpophilum 

 and Conjnemn Beijeri/iclcii are the fungi that cause most of the trouble. 

 A number of others, however, have been found to give rise to gummosis 

 in Amygdalacea3, and cause the death of the host. 



Anew work on plant pathology has been begun by Arno Xaumauu.** 



* Bull. Exper. Stat., Purdue Univ., 119 (1907) pp. 427-32. See also Bot. 

 Centralbl., cv. (1907) pp. 243-4. 



t Board of Aa;ric. and Fisheries, 4 Whitehall Place, London, S.W., Leaflets 

 Nos. 183, 193, and 200. 



X Beih. Tropenpfl. Jahrg., 1906, Nos. 4 and 5, 100 pp., 4 pis. and 8 figs. See 

 also Centralbl. Bakt., xix. (1907) pp. 350-2. 



§ Oesterr. bot. Zeitschr. Wien, Ixii. (1907) pp. 177-81. See also Bot. 

 Centralbl., cv. (1907) pp. 361-2. 



II Zeitschr. Pflanzenkr., xvii. (1907) pp. 158-69 (2 pis.). 



^ Diss. Amsterdam, 1906. See also Zeitschr. Pflanzenkr., xvii. (1907) pp. 

 179-80. 



** Die Pilzkrankheiten gartuerischen Kulturgewachse. Dresden: C. Henrich, 

 viii. and 156 pp., 3 pis. and 42 figs. 



