752 EXPERIMENT STATION RECORD. [Vol. 36 



wholly ringed by a fungus which is said to be Fusarium lateritvum. This has 

 been hitherto regarded as a harmless saprophyte. 



Eelworm in daffodils, A. J. Bliss (Gard. Chron., 3. ser., 60 {1916), No. 15^1, 

 pp. S3, 84). — The author cites experiences which are thought to justify the 

 belief that the disease of narcissus bulbs attributed by Massee to Fusarium 

 hulbigenum (E, S. R., 30, p. 354) is really due, at least in large part, to the 

 nematode TyJencTius devastatrix. He advises the use of a light, sandy soil 

 known to be free from nematodes, good cultivation and drainage, avoidance of 

 farmyard manures, careful examination of bulbs before setting, careful handling, 

 shallow planting, and removal of all suspected bulbs. 



Leaf spot rot of pond lilies caused by Helicosporium nymphaeanim, F. V. 

 Rand (U. S. Dept. Agr., Jour. Agr. Research, 8 (1917), No. 6, pp. 219-^32, pis. 

 4). — An account is given of an irregular spotting and decaying of leaves of 

 pond lilies, which was first noticed in the spring of 1913. The causal organism 

 has been isolated and its pathogenicity demonstrated by successful inocula- 

 tion into 9 species of Nymphsea. The fungus is described as a new species under 

 the name H. nympha;arum. 



Spraying experiments with ordinary Bordeaux mixture and soda Bordeaux 

 mixture have been conducted with successful results on a commercial scale. 



Studies on chestnut tree diseases, V. Ducomet (Ann. Serv. Epipht/ties, Mem. 

 et Rap., 2 {1913), pp. 101-108, figs. 3). — Discussing the geographical distribu- 

 tion and extension of the disease called back canker, its causation, and pro- 

 tective measures, the author expresses doubt as to its being caused exclusively 

 by Melanconis modonia {M. perniciosa) and its Coryneum form, as a disease 

 apparently comparable is associated with Cyfodiplospora castanecp. 



Treatment of the soil by disinfecting it with carbon bisulphid and by the ad- 

 dition of chemical fertilizers failed to check the progress of the disease, but 

 cutting away the diseased upper portion of a tree infected with Coryneum ap- 

 parently stopped its progress. It is thought that Melanconis is not primarily 

 the causative parasite. Of the Japanese varieties showing resistance to black 

 canker, two proved to be susceptible, though in different degrees, to oak tree 

 Oidium. 



Black canker of chestnut and the restoration of the chestnut, A. Peunet 

 {Ann. Serv. Epiphyties, Mem. et Rap., 2 {1913), pp. 67-100, figs. 5; abs. in 

 Alpe [Italy'i, 2. ser., 3 {1916), No. 6, pp. 168-177, fig. Jf).— The author gives an 

 account of the parasitic character and the effects of black canker, ink disease, 

 or black root of chestnut. This has been known in northern Italy since 1842 

 and since noted throughout a large part of Mediterranean Europe and as far 

 west as the Azores, but probably not in Asia Minor or Africa. The author 

 discusses the attempts made to restock areas where the chestnuts have been 

 destroyed, by use of the common chestnut and of Asiatic (particularly Japa- 

 nese) species which appear more or less resistant to this disease; also by the 

 use for stocks of other trees resistant to black canker. 



A method to induce sporulation in cultures of Botryosphaeria beren- 

 g'eriana, J. Matz {Phytopathology, 6 {1916), No. 5, pp. 387-389, fig. i).— The 

 author states that B. berengeriana seldom forms spores in ordinary cultures. It 

 was discovered that by sterilizing and inoculating pieces of pecan twigs and 

 covering these with paraffin after inoculation pycnidia containing pycnospores 

 were readily produced. 



Phacidium infestans on western conifers, J. R. Weir {Phytopathology, 6 

 {1916), No. 5, pp. 413, 414). — The author reports the occurrence of P. infestans 

 on Abies grandis, A. lasiocarpa, A. concolor, and Pseudotsuga taxifolia, and 

 states that in the Western Hemisphere it seems to occur chiefly between the 

 fortieth and forty-fifth degrees of latitude. In Sweden it is stated that the 



