DISEASES OF PLANTS. 547 



exotica, Plumeria acutifolia, Thephrosia purpurea. Polygonum chmense, De- 

 hre^easia longifoUa, Rauwolfia javanica, Cypholopfius lutescens, Lantana 

 sanuira, Eriohotrya japonica, Melochia indica, Domheya xcaUichu, Eupatorium 

 ianthinum, Diospyros kaki, Claoxylon indicum, Macropanax oreophUum, Ho- 

 malantlms po'pulneus, Urena tomcntosa, Saurauja spp., Trevia orientalis. Eu- 

 calyptus saligna, Cassia spp., Cedrcla sinensis, Ccstrum aurantuwum, Lansium 

 doinesticum, Artocarpus integrifolia, Orthosiphon stamineus. Gardenia florida, 

 Sesbania (cgyptiaca, Clerodendron macrosvphon, Cupressus glauca pendula, 

 Stachytarpheta dichototna, Allanianda liendcrsQui, Hibiscus spp., and Nerium 

 oleantder. 



Four forms of the disease are given, viz, (1) the typical fruit-bearing form 

 of C javanicum, (2) whitish, knot-like rhizomori^hs, (3) white, glistening, 

 cobweb-like fungus threads called the cobweb mycelium, and (4) the Xccator 

 decretus form. It is claimed that the general method of infection is as fol- 

 lows : First, the spores of Corticium or Necator fall on a branch. These spores 

 on germination form the cobweb mycelium stage in which the fungus lives 

 as a saprophyte. From this develops the knot-like rhizomorphs, which finally 

 infect the living tissues of the host, followed eventually by the fruiting form 

 of Corticium and Necator, by which time the attacked portion is usually dead. 

 From cross-inoculations with the different forms of this oi'ganism on various 

 hosts, the conclusion is reached that the cobweb mycelium, the knot-like rhizo- 

 moi-phs (sclerotia), and iV. decretus are but different stages in the life history 

 of C javanicum. 



[Pear blight and alfalfa leaf spot], S. F. Edwamjs {Arm. Rpt. Ontario Agr. 

 Col. and Expt. Farm, 36 {1910), pp. 163-168, figs. 3).— In a report on pear 

 blight, prepared by D. H. Jones, it is claimed that this disease has been preva- 

 lent on both apple and pear trees, but not so seriously as last year. In one 

 young orchard trees were found which had been inoculated with the disease 

 by the buffalo tree hopper to such an extent that twigs, limbs, and bark were 

 all badly infested. The characteristic slit punctures of the tree hopper were 

 found in rows on the trunks of the young trees, and from these punctures 

 the disease had spread imtil in some cases the tree was completely girdled 

 and killed. In another orchard conclusive evidence was found that the shot- 

 hole bark-boring beetle (Scolytiis rugulosus) was a carrier of the blight, as 

 many of the trees had shot-hole borings around which the blight had extended 

 producing the characteristic blight cankers. 



A leaf spot {Pseudopeziza medicaginis) of alfalfa is also discussed and de- 

 scribed. 



Illiizoctonia medicaginis in America, F. D. Heald {Phytopathology, 1 

 {1911), No. 3, p. 103). — Attention is called to previous notes on the occurrence 

 of this disease in America (E. S. R., 18, p. 244; 20, p. 437), and a brief de- 

 scription is given of the symptoms of the disease and the damage done by it in 

 an infected alfalfa patch in Nebraska. 



New hosts for Sclerospora macrospora, G. Seveeini {Staz. Sper. Agr. Ital., 

 43 {1910), No. 10, pp. 774-786, pis. 2).— The hosts listed are as follows: 

 Hordeum vulgare, Tricticum sativum, Arena sativa, Festu^a elatior, Alopecurus 

 agrestis, Lolium temulentum, and Agropyrum repens, of which H, vulgare and 

 F. elatior are said to be new hosts for this fungus. 



Sphacelotheca reiliana on Sorghum halepense, O. Muneeati {Stas. Sper. 

 Agr. Ital., 43 {1910), No. 10, pp. 718-722, figs. 2 ) .—Attention is called to the 

 occurrence in Italy of this smut on Johnson grass. 



Rhizoctonia of buckwheat, F. L. Stevens and G. W. Wilson {Abs. in Science, 

 n. ser., 33 {1911), No. 859, p. 943),— At the tenth annual meeting at Raleigh 



