No. 4, January, 1922] PATHOLOGY 195 



1201. Cook, ]\Iel. T. [Rev. of: Stevens, F. L. Diseases of economic plants. Mac- 

 millan and Company: New York, 1921.] Science 53: 502-503. 1921. 



1292. Dickson, B. T. Studies on mosaic. [Abstract.] Phytopathology 11: 202. 1921. 

 — This includes a general discussion of mosaic diseases and notes on certain ones found in 

 Quebec. — B. B. Higgins. 



1293. Edgerton, C. W., and C. C. Moreland. Eggplant blight. Louisiana Agric. Exp. 

 Sta. Bull. 178. -^4 V-t iSf'Q- 1921. — The eggplant blight (Phomopsis vexans) reduces the yield 

 in Louisiana 50-75 per cent. All parts of the host plant above ground during all stages of 

 growth are affected. Leaf spot and fruit rot are the forms most commonly seen, but the dis- 

 ease also manifests itself as cankers on the stems, leaf fall, and damping off in the seed bed. 

 The fungus lives from season to season on and in the seed and also upon old decaying parts of 

 the host plant. There are 2 kinds of spores, both borne in somewhat variable pycnidia. 

 Normal period of incubation is 7-9 days. Injury to the epidermis is not necessary for infec- 

 tion. Different eggplant varieties do not show equal susceptibility. Spraying is successful 

 only when the plants are kept covered with the fungicide, which requires 10-12 sprayings in 

 Louisiana. Control measures advocated include clean seed, rotation, strong plants for trans- 

 planting to the field, and the use of the most resistant varieties. — C. W. Edgerton. 



1294. McCuLLOCK, Lucia. A bacterial disease of gladiolus. Science 54:115-116. 1921. 

 — The disease affects the leaves, often only the lower ones, forming circular to elliptical lesions 

 which are rusty red in color, becoming dull brown to purplish; in time the leaves collapse. 

 The disease, which spreads rapidly only in warm and moist weather, has been found in the 

 District of Columbia, Illinois, and possibly in California. The causal organism. Bacterium 

 marginatum n. sp., is described, cultural characteristics being given; its group number is 

 211.2222022. The organism is resistant to cold but is killed at 52°C.— C. J. Lyon. 



1295. Montemartini, L. Un brusone dell'Aucuba japonica dovuto alia Pleospora in- 

 fectoria Fuck. [A blight of the leaves of Aucuba japonica due to P. infectoria.] Riv. Patol. 

 Veg. 11: 33-35. 1921. — A fungus, causing a browning of the leaves of Aucuh a japonica be- 

 ginning at the tips and margins of the leaves, was found to correspond closely to Pleospora 

 infectoria; but, because of the greater frequency of distichous asci, the smaller dimensions of 

 the perithecia, and the new host, the variety name aucubicola is added. The imperfect stage 

 corresponds to Alternaria tenuis. — F. M. Blodgett. 



1296. PovAH, Alfred H. W. An attack of poplar canker following fire injury. Phytopath- 

 ology 11: 157-165. Fig. 1-3. 1921. — In a group of 70 poplar {Populus grandidentata and 

 P. tremuloides) trees in a burned-over area, 50 became infected with Cytospora chrysosperma. 

 Large cankers 1-10 feet long were produced on the trunks and branches, and approximately 

 3 months after the fire 27 of the trees had been girdled and killed. Pycnidia and spores were 

 produced in great abundance on the cankers. Perithecia of Valsa sordida were also found 

 on several cankers, but the relation of this ascigerous form to Cytospora chrysosperma has 

 not yet been determined. Cuttings of Populus tremuloides and of P. grandidentata inocu- 

 lated with spores of Cytospora chrysosperma were infected and killed. — B. B. Higgins. 



1297. Sakurai, M. Ine no Kinkakubyo ni tsukite. [On the sclerotium diseases of rice.] 

 Ehime Kenritsu Noji Shikenjo Shuppan Daiichigo (Ehime Agric. Exp. Sta. Publ. 1.) 51 p.. 6 pi. 

 1917. [In Japanese.] — Four diseases of rice due to sclerotia-forming fungi are described. 

 Hypochnus sasakii attacks the plants from June to October, producing irregular brown spots 

 on the leaf-sheaths and more rarely on the blades. Brown sclerotia are formed on the 

 spots or betweenthe leaf-sheaths and the stems. A fungus resembling Hypochnus centrifugus 

 forms sclerotia in the tissues of the leaf-sheaths, but the damage is slight. The sclerotia are 

 spherical, white at first, then brown. A third fungus, resembling Sclerotium oryzae, attacks 

 the stems and leaf-sheaths during August, causing lodging of plants and consequently heavy 

 damage. The sclerotia are spherical to ovate, black on the surface and dark brown within. 



