272 EXPERIMENT STATION RECORD. 



the root rot has not been determined. A leaf spot caused by Alternaria is described 

 at some length, and the injury caused by snails, scale insects, and stem borers is 

 noted. 



Investigations on the prevention of Botrytis cinerea, P. de la Bathie (Rev. 

 Vit., 21 (1904), No. 540, pp. 433-43S). — An account is given of a series of experiments 

 for the prevention of the gray rot of grapes due to Botrytis cinerea. A vineyard was 

 divided into 3 zones, the vines of one of which were sprayed, the second sprayed 

 and the diseased leaves removed, while in the third the vines had all the diseased 

 leaves removed but were not sprayed. The fungicides used were a trade preparation 

 known as " Matarotine, " a mixture of alum and lime, a solution of permanganate of 

 potash, a simple solution of alum, powdered gypsum, and a mixture of lime and 

 aluminum sulphate. 



The disease appeared at 2 distinct epochs, the first between July 18 and 31 and the 

 second at a considerable interval. None of the treatments were efficient in prevent- 

 ing its attack. The removing of the diseased leaves combined with the application 

 of the fungicides appeared to slightly reduce the disease, but only to a very limited 

 extent. In the investigations reported upon a decided difference was noted in the 

 resistance of different varieties toward the fungus, and investigations will be continued 

 along the line of disease resistance. 



Investigations of the brunissure of grapes, L. Kavaz (Prog. Agr. et Vit. (Ed. 

 L'Est), 25 (1904), No. 19, pp. 568, 569). — The results of some experiments conducted 

 in the vineyard of the School of Agriculture of Montpellier for the control of brunis- 

 sure are given. In these experiments the author pruned the stock in various ways, 

 cutting back some very short, others as ordinarily pruned, while a third lot were 

 allowed to carry a great number of canes with 4 or more buds. 



At fruiting time the stock bearing the least number of grapes fared best. The 

 author maintains that brunissure is not due to any fungus, but is a result of over- 

 bearing, and the intensity of the disease is in proportion to the production and total 

 growth of the stock. If this hypothesis is true, then diminishing the production of 

 grapes and stimulating the vegetative growth by the use of fertilizers rich in potash 

 will prevent the disease. It is said that in his study the author is convinced that 

 brunissure is an infection of young vines and its recent distribution and occurrence 

 is to be attributed to the restoration of vineyards which have been destroyed by the 

 Phylloxera. 



Grape anthracnose, P. Pacottet (Rev. Vit, 21 (1904), No. 525, pp. 5-8, pi. 1). — 

 An account is given of the grape anthracnose due to Sphaceloma ampelinum. This 

 disease is said to be widely distributed and at times very serious in its injury to the 

 grape crop. For its prevention the author recommends a winter treatment of a 

 strong solution of iron sulphate to which is added sulphuric acid. This may be fol- 

 lowed during the growing season by applications of other fungicides as the conditions 

 of the season require. 



O'idium and TJncinula spiralis, J. M. Gutllon and G. Gouirand (Rev. Vit,., 20 

 (1903), No. 523, pp. 725-727). — A review is given of the occurrence of the powdery 

 mildew of the grape and the relation between the conidial stage, O'idium or Erysiphe 

 tuckeri, and the perithecial stage, Uncinida spiralis, pointed out. 



Cultures of the black-rot fungus, P. Viala and P. Pacottet (Rer. Vit., 21 (1904), 

 No. 529, pp. 117-122, Jigs. 3). — An account is given of the successful cultivation on 

 artificial media of the black-rot fungus Guignardia bidwellii. 



Cultures of this fungus were obtained by using portions of mycelium separated 

 from affected grapes, the mycelium and portions of the pulp being transferred to the 

 culture medium. After 8 to 10 days it was found that the mycelium had grown 

 extensively and in 15 days the fungus was in the fruiting stage. The effect of acids 

 and sugar of different kinds on the growth of the fungus is shown. 



Simultaneous treatment for powdery and downy mildew, D. Donon (Jour. 



