1917] DISEASES OF PLANTS. 245 



United States all 5-leaved pines from Europe and Asia, on account of the white 

 pine blister rust ; potatoes from Newfoundland, St. Pierre, Miquelon, Great 

 Britain, Germany, and Austria-Hungary, because of potato wart, and this 

 quarantine is extended to include Canada and all continental Europe except 

 Denmark and most of the Netherlands, on account of the powdery scab ; sugar 

 cane from all countries, on account of several serious diseases; all kinds of 

 citrus plants from all foreign countries, because of citrus canker and other 

 serious diseases ; and corn from Java and India, because of Sclerospora maydis. 



In addition several quarantines have been established to exclude insects. 



Some interesting finds in the phytopatholcgical inspection service for 

 1915, G. R. Lyman {Abs. in Phytopathology, 6 (1916), No. 1, p. 96).— In the in- 

 spection service in connection with the enforcement of the Federal horticultural 

 law, there were found, during the season reported upon,, citrus, canker on 19 

 different lots of budwood from the Philippine Islands ; withertip on budwood 

 from the Philippines. Japan, Peru, Australia, and the Fiji Islands ; and powdery 

 scab on potatoes from Peru and Ireland. The Dutch bulb disease, due to 

 Botrytis parasitica, was found on two shipments of bulbs grown by the Depart- 

 ment at Bellingham, Wash. The same disease was found on tulips from Ireland 

 and on narcissus from Holland. 



Growth of parasitic fungi in concentrated solutions, L. A. Hawkins (U. S. 

 Dept. Agr., Jour. Agr. Research, 7 {1916), No. 5, pp. 255-260). — The author re- 

 ports an investigation to determine the possibility of the growth of fungus 

 parasites in solutions of a considerably higher concentration than is found 

 in the cell sap of the host plants. Ten common parasitic fungi were grown 

 in solutions of salts and sugars of rather high concentrations, and in ex- 

 periments in which fungi were grown in solutions of potassium and cal- 

 cium nitrate, sucrose, and glucose, it was found that in every case the fungi 

 grew readily in solutions in which the diffusion tensions were much higher 

 than the total diffusion tensions of the dissolved substances in the juices of 

 their host plants. 



Culture work on the heteroecious rusts of Colorado, E. Bethel (Abs. in 

 Phytopathology, 6 {1916), No. 1, p. 99). — Some of the results are briefly men- 

 tioned of culture experiments which liave extended over a period of five 

 years. 



Puccinia stipce has been grown on 9 different genera of Compositje, P. andro- 

 pogonis upon 8 species representing 2 genera, and P. agropyri upon 4 host 

 genera. The telial stages are reported for ^cidium rcesteUoides, M. allenii, 

 ^. phaceliw, M. onosmodii, and M. liatridis. Interesting or new secial hosts 

 have been found for Uromyces junci, Pucciniastrum pustulatum, Puccinia 

 amphigena, and some other species. 



Rusts in the department of Sotshi, N. N. Voronikhin (Woeonichin) 

 {Trudy Biuro Prikl. Bot. {Bui. Appl. Bot.), 8 {1915), No. 6, pp. 769-807, pis. 3, 

 figs. 5). — The author concludes from his mycological studies during 1912 and 

 1913 that fungi causing rusts are widely distributed on trees and shrubs along 

 the shores of the Black Sea and also in more elevated regions. Eleven rust- 

 producing fungi are named, six of these being technically described as new 

 species under the names Antennulariella fuliginosa (also classed as a new 

 genus) on Ilex aquifolium, Zukalia caucasica on Taxus baccata, Z. setosa on 

 Prunus laurocerasus and Rhododendron ponticum, Limacvnula caucasica on 

 Taxus baccata, Chcetothyrium colchicum on Ilex aquifolium and Citrus sp., and 

 Triposporium tenue on R. ponticum and Sfaphylea colchica. 



Two wild hosts of Bacterium solanacearum, H. R. Fulton and E. E. Stan- 

 ford {Abs. in Phytopathology, 6 {1916), No. 1, pp. lOS, 109). — The authors re- 

 port having isolated B. solanacearum from Ambrosia artemisiwjolia and 



