NOTES AND ABSTRACTS. 



643 



250; April 1912; figs.). — The following diseases of ginseng (Pa?iax 

 quinquefolium) are described, and suitable methods of dealing with 

 them outlined: Alternaria blight caused by Altemaria Panax, Whetz. ; 

 mildew due to PhytophthoroA cactorum; anthracnose due to Vermi- 

 Gularia dematmm ; leaf spots due to Pestalozzia funerea and to cultural 

 mistakes; damping off caused by Ehizoctonia, Phytophthora cactorum,, 

 and Pythium deharyanum; wilting brought about by the fungus 

 Acrostalagmus sp., and by a species of Fusarium; root knots due to the 

 eelworm Heterodera radicicola; root rots due to Thielavia hasicola and 

 to Sclerotinia Libertiana and S. panacis. Soil sterilization is recom- 

 mended as a method of dealing with eelworms and soil fungus 

 troubles.— i^. J. C. 



Gooseberry Mildew in Kent, American {Jour. S.E. Agr. 



Coll., 1911; p. 31). — Gives an account of the prevalence of this 

 disease in Kent in 1911. — F. J. C. 



G ape Leaf-Hopper and its Control, The. By F. L. Hartzell 



{U.S.A. Exp. Stn., N. York, Bull. 344; Feb. 1912; 4 plates, 3 figs.).— 

 The author gives a description of the insect with life-history and also 

 describes an automatic sprayer. He says that a nicotine solution 

 diluted until there is 2/100 of 1 per cent, nicotine in the spray 

 material will kill the insects, if sufficient is used, at a pressure of 

 125 to 150 lb. to the square inch. The under-sides of the leaves must 

 be drenched with the spray. — V. G. J. 



G ap Leaf-Hopper, Spraying- Experiments ag-ainst the. 



By Fred Johnson {U.S.A. Dep. Agr., Bur. Entom., Bull. 97, pt. i. ; 

 March 1911; 2 plates, 5 figs.). — The Grape leaf-hopper {Typhlocyha 

 comes Say) is a familiar enemy to most vine- growers. In the Lake Erie 

 Valley the damage done by it has hitherto been confined to limited 

 areas, usually adjacent to rough lands and woodlots, but in 1910 it 

 greatly increased and spread. Therefore, growers must be prepared to 

 combat it. ' Experiments show that spraying with black leaf -tobacco 

 extract 1 gallon to 1750 gallons of water is effective if thoroughly 

 applied. — V. G. J. 



Grapes, A Precaution before Eating" {Rev. Hort. Beige, 



p. 324; Oct. 1, 1911). — A warning to consumers that it is wise to 

 wash all commercially grown fruit, and especially grapes, before 

 bringing them to table. Several deaths have been reported from 

 Perpia.n, caused by eating grapes which had been sprayed with poison- 

 ous insecticides. — M. L. H. 



Grasses, A Sclerotium Disease of Common. By A. B. Stout 

 {U.S.A. Exp. Stn., Wisconsin, Research Bull. 18; June 1911; 

 8 plates). — A disease attacking several species of common grasses, 

 many of which are British, is described and excellently figured. The 

 grasses become dry, rigid, and crookedly bent, while upon the leaves 



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