546 EXPERIMENT STATION RECORD. 



had been reported from several localities in the State on white pine seedlings, 

 has been apparently eradicated. 



The results are given of potato spraying experiments with Bordeaux mix- 

 tures, in which the influence of the character of the fertilizer (stable manure 

 V. nitrate of soda) used, the system of cultivation (ridged or flat), and the 

 effect on the late blight and scab of the potato of growing successive crops of 

 potatoes on the same land are investigated. The benefits other than fungicidal 

 derived in a dry season from the use of Bordeaux and arsenate of lead sprays 

 are believed by the author to be due to the conservation of moisture in the 

 leaves during dry seasons by clogging the stomata and water pores with the 

 sediment of the spray. Details are also given of experiments in spraying con- 

 ducted during 190G, 1907, 1908, and 1909. In both wet and dry years increased 

 yields were obtained by spraying with a 4:4: 50 Bordeaux mixture. 



The author describes in detail studies on the formation of oospores of the 

 potato blight, including media used, variability of oospore production, micro- 

 scopic characters of the oospores, and hybrids, a preliminary account of which 

 has been previously noted from another source (E. S. R., 25, p. 348). The best 

 culture medium for the production of oogouia, anthridia, and oospores was 

 found to be an oat-juice agar prepared as follows : Fifty gm. of ground oats 

 mixed with from 300 to 350 cc. of water was cooked for 30 minutes in a covered 

 dish with steam from an autoclave run in by means of glass and rubber tubing, 

 and after straining the coarser materials off, 10 gm. of agar was added and 

 the mixture steamed for another 30 minutes. The mixture was then brought 

 up to 500 cc. by adding water if necessary, poured into test tubes, and sterilized 

 lor 15 minutes under from 7 to 10 lbs. pressure. This was the only medium in 

 which the author was able to obtain perfectly developed and mature anthridia 

 and oospores. It was also found that the best condition for oospore production 

 is between neutrality and 15 cc. acidity of the medium. 



Fungi and plant pathology, S. B. McCready {Ann. Rpt. Ontario Agr. Col. 

 and Expt. Farm, 36 {1910), p. 37). — A report is made on the diseases examined 

 during the year, and on experiments for the control of black rot of the apple 

 {SijJueropsis malonim). The characteristics of stinking smut and loose smut 

 of grain are given, together with a brief description of the accepted methods 

 for combating them. 



Four little-known British fungi, W. B. Grove {Jour. Econ. Biol., 6 {1911), 

 No. 2, pp. 38-.'i9. pis. 2, fig. 1). — Descriptions ai-e given of Mucor spinosus, 

 which ferments glucose but not sucrose, of M. spinosus recurvus, of Rhopalo- 

 cystis nigra, which is a convenient source of invertase and emulsin, of Monilia 

 lupuU found on the surface of spent hops when exposed in heaps to the air, and 

 of Hormodendron cladosporoides. 



The article closes with a brief discussion of the differences between certain 

 species of Hormodendron and closely related Penicillium species. 



Studies on Corticium javanicum, A. Rant {Meded. Dept. Landb. [Dutch 

 East Indies], 1911, No. 13, pp. 38, pis. 7). — In a general study of this fungus 

 the author cites its known hosts, gives its distribution, describes the charac- 

 teristics of the disease, and gives the results of inoculation experiments with 

 the fungus from various hosts and localities, methods of infection, and means 

 of combating the disease. 



The following hosts are listed: Coffea spp., Bixa sp., Thea spp., Bcehmeria 

 spp., Cinnamomuni zeylanicum, Cola acuminata, Indigofera spp., Duranta 

 plumieri, Erythroxylon coca, Theobroma cacao. Cinchona spp., Hevea hra- 

 siliensis, Myristica fragrans, Eriodendron anfractuosum. Piper nigrum, Acacia 

 farnesiana, Anonu spp., Achras sapota, Citrus spp., Cynometra ramiflora, Man- 

 gifera spp., Erythrina spp., Tftw/a- spp., Castilla elastica, Ficus spp., Murraya 



