350 EXPERIMENT STATION EECOED. 



plant. Some of tlie trees which were affected by the disease apparently fully 

 recovered. 



Treatment with iron sulphate proved valueless, and the only known method 

 of combating the disease is by destroying the badly affected trees, especially 

 the dead limbs, or the entire tree when dead, as it seems that the fungus 

 enters by means of the spores which are produced only on dead wood. 



The deformation of Prunus mahaleb by a parasitic fungus, M. Moreillon 

 (Jour. Forest. Suisse, 61 {1910), No. 2, pp. 31-35; Schweiz. Ztschr. Forstio., 

 61 {1910), No. 5, pp. 152-155, figs. 3; ahs. in Bot. Centbl, 114 {1910), No. IJ,, 

 p. 361). — Attention is called to a disease of this plant which kills portions of 

 the inflorescence and of the young foliage, this being followed by a development 

 of young axillary buds after each yearly attack, until in the course of time the 

 bush shows a peculiar dichotomous like type of branching. 



The fungus was identified by D. Cruchet as Cucurbitaria pruni maJialeb, and 

 was associated with another parasite which he named and described as Myxo- 

 sporiuDi priaii mahaleh n. sp. 



The principal diseases of our vineyards, A. I. Perold {Agr. Jour. Cape Good 

 Hope, 37 {1910), No. 4, pp. 370-377). — It is claimed that in the southwestern 

 districts of South Africa the most dreaded vine diseases of other countries have 

 not yet made their appearance, mainly because of the dry summers which are 

 unfavorable to the development of most fungus diseases. 



However, two diseases are prevalent there, viz, white rust {O'klium tiickeri) 

 and anthracnose. For the Oi'dium, sulphuring the vines 3 times with flowers 

 of sulphur is recommended, first, when the young shoots are 6 in. high, second, 

 when the vines begin to flower, and third, just before the berries become soft 

 and transparent. For combating the anthracnose during the summer, a mix- 

 ture of lime and sulphur is dusted on the vines, but a winter treatment con- 

 sisting of washing the bark with a mixture of 110 lbs. of sulphate of iron, 1^ 

 bottles of strong sulphuric acid, and 22 gal. of hot water, gave better results. 



On a case of court-noue of grapes in France, P. Jaccaed (Arch. Sci. Phys. 

 et Nat. [Geneva], 4. ser., 28 {1909), No. 11, pp. 519-521; abs. in Centbl. Bakt. 

 letc], 2. AM., 28 {1910), No. 9-11, pp. 282, 283).— The author states that in a 

 vineyard of some 10,000 5-year-old grafted vines this disease has become so 

 prevalent that three-fourths of the plants are attacked, resulting in a much 

 reduced yield. 



No evidence of animal or plant parasites was found in the diseased tissues, 

 but an examination of the twigs and leaves during the latter part of August 

 showed a lignification and an accumulation of starch in the smaller branches, an 

 arrested development of the leaves, and an alteration of their chlorophyll. The 

 leaves, when viewed by transmitted light, showed a brownish or reddish color 

 along the veins, while the cells at the base of the petioles showed alterations 

 in the middle lamellje and an excess of calcium oxalate throughout the petioles. 



The author claims that it is a true physiological enzymatic disease, due prob- 

 ably to an imperfect adaptation of the grafted stocks to the soil or subsoil. 



The gray rot (Botrytis) of grapes in 1910, L. Lebrun {Prog. Agr. et Vif. 

 (Ed. VEst-Centre), 31 {1910), No. J/S, pp. 502-509).— The author discusses the 

 serious loss during this year to Burgundian vineyardists due to the widespread 

 and severe attacks of this fungus, and gives tables showing the amount and 

 number of hours of rainfall for each May, June, and July, from 1907 to 1910, 

 inclusive, together with the mean temperatures for these months. 

 . After comparing the relative amount of gray rot during each of these years 

 with the temperature and rainfall, the conclusion is reached that the unusual 

 amount of rot for 1910 is due to the extra amount of continuous rainfall, es- 



