DISEASES OF PLANTS. 823 



A method of destroying dodder, A. Servais {Iiujen. Agr. Gcml}lonr,5 (ISO.',), Xo. 

 8, pp. 354, 355). — The plauts on the spots where dodder is present are carefully 

 removed and burned, the spot is worked with a hoe or rake, and orchard grass or 

 some other quick-growing species is planted on the infested spot. The author states 

 that dodder thus treated may be entirely eradicated within 2 years. 



Troublesome grasses of southern New Jersey, M. Trkat {Garden and Forest, 8 

 (1895), pp. 103, 104). — Notes are given on Elnsine indica, E. wt/yptiaca, Bermuda grass, 

 and coco or nut grass. 



DISEASES OF PLANTS. 



Fungus diseases of plants, B. D. Halsted [New Jersey Stas. Rpt. 



1893, pp. 3^0-430, Jigs. 63). 



Sijnops'nt. — Notes are given on fungi on weeds, strawberry diseases, club root of 

 cabbage and its allies, soil rot of sweet potatoes, on the identity of the 

 anthracnose of watermelon and bean, fungus diseases of the muskmelon, some 

 fungus diseases of the pea, a fatal disease to truck crops, field observations 

 upon fruit decays, decays of mature apples, blight of ornamental spurge, 

 fungus diseases of cultivated sediims, hollyhock fungus diseases, some carna- 

 tion fungus diseases, mint rust on balm, fungus diseases of ornamental bulbous 

 plants, anthracnose of rose, ivy blight, palm diseases, blights of draciena, 

 orchid diseases, blight of ornamental ferns, bacteria in some of their relations 

 to crop growing, leaf blight of calceolaria, dropsical pelargoniums, and notes 

 on a new ExohasidUim. 



Fungi on weeds (pp. 320,327). — Notes are given on several fang-i that 

 serve to keep some of our worst weeds in clieck. The species of fungi 

 mentioned are Cysiopus candidus on the sheplierd's purse and some 

 other cruciferous plants, C. portulacce on the common purslane, and 

 Puccinia suaveolens on the Canada thistle. A report is given of the 

 last-named fungus having nearly exterminated an acre of the thistle, 

 scarcely a plant maturing any seed. 



Diseases of the strawberry (pp. 327-332). — The more important fungus 

 diseases of the strawberry as enumerated aie: Leaf s^jot {Spliarella 

 fragaricc), leaf blight {FliyUosticta fragaricola), leaf spot {tSeptoria 

 aciculosa), leaf spot {Ascochyta fragaricc), anthracnose {Glccosporium 

 fragaricc), leaf blight {Ramularia modesta), and mildew [Peronospora 

 fragariw). Of these the leaf spot {SpluereUa fragarice) is perhaps the 

 most destructive. The author reviews the more important contribu- 

 tions on this disease since 1887, when there was given a comi)rehensive 

 bibliography.^ Anotherof the leaf spots (Ascoc/^y/a/rfl/^arice) may easily 

 be mistaken for this disease. A new strawberry leaf blight has been 

 under investigation by the author since 1892. It was tirst discovered 

 near Syracuse, ISTew York, and it seems to be far from rare, though 

 often obscured by the i)resence of other fungi. The disease is caused 

 by a fungus apparently of the genus Aposphmria. This fungus appears 

 to prefer the upper surface of the leaf, but develops its pycnidia on 

 both sides of the leaf. The affected portions lose their characteristic 

 green and soon become brown. The pycnidia first aj^pear as minute 



» U. S. Dept. Agr. Rpt. 1887, p. 340. 



