344 EXPERIMENT STATION EECORD. 



fungus affects the young buds, causing a pronounced malformation of the 

 organs concerned. The fungus is parasitic in the flower buds, and the stimulus 

 exerted by the mycelium causes a modified development of the different organs. 

 The extent of modification seems to depend on the stage of growth when para- 

 sitism is set up. 



Becent studies on the chlorosis of grapes and the effect of mineral fer- 

 tilizers, J. Beknastky (Prog. Agr. et Vit. {Ed. VEst-Centre), 32 {1911), No. 

 32, pp. 162-164). — In continuation of his jirevious studies on the treatment of 

 chlorosis (E. S. R., 21, p. 551), the author has paid special attention to the 

 effect of different phosphates and phosphatic fertilizers. 



The investigation as a whole shows the role of iron in relation to chlorosis 

 to be insignificant, since the plant becomes chlorotic even in the presence of an 

 abundance of iron when the medium is allialine. The alkaline phosphates 

 appeared to cause chlorosis, while the acid phosphates had a curative effect. 

 It was also demonstrated that chlorosis is not caused by a lack of potash. 



From a test of the phosphatic fertilizers, it appeared that the superphos- 

 phates have no effect on acid soils and that basic slag is of no value on alkaline 

 soils. The author recommends the use of basic slag, first on acid soils, and 

 secondly on neutral soils, and the use of superphosphate on lime soils where 

 they are of value both for their content in phosiihates and for their acid 

 reaction. 



Chlorosis and lime, G. Peovost-Dumaechais {Jour. Agr. Prat., n. ser., 22 

 {1911), No. 46, pp. 616, 617).— In a previous publication (E. S. R., 25, p. 849), 

 the author described a probable relation between the downy mildew of grapes 

 and chlorosis, and held that the fungus was favored in its development by a 

 weakened condition of the stock which resulted in chlorotic growth. 



In the present paper he calls attention to the fact that the American vines, 

 which are resistant to phylloxera and consequently are much used as stock, 

 are very subject to unfavorable proportions of lime in the soil. In many re- 

 gions in France there is a high content of lime, and, as a result, chlorosis is 

 very prevalent. 



For preventing chlorosis, the author recommends watering about the roots 

 with a solution of iron sulphate, spraying the leaves during the growing sea- 

 son, and during the dormant period washing the stems with a strong solution 

 of iron sulphate. 



On the propagation of downy mildew by wind, G. MonneyeIis {Prog. Agr. 

 et Vit. {Ed. VEst-Centre), 32 {1911), No. 49, pp. 668, 669).— The author calls 

 attention to the probable role of winds in the distribution of the spores of the 

 downy mildew, showing that the disease spreads rapidly in the direction of 

 prevailing winds and that it is more severe when the wind blows strongly for a 

 considerable time. This, he says, causes the turning of the leaves so that the 

 spores find lodgment on the lower surfaces, where they can more readily attack 

 the host plant. 



American gooseberry raildew on red currant bushes (Gard. Chron., 3. ser., 

 50 {1911), No. 1305, p. 473).— It is stated that during the past summer in Cam- 

 bridgeshire, England, at least 59 cases of gooseberry mildew {Sphwrotheca 

 mors-uv(r) have been reported on red currants. In every case the currant 

 bushes were in the vicinity of mildewed gooseberry bushes, and judging from 

 the previous absence of the fungus on currants it is believed that it has 

 adapted itself to a host which hitherto has been practically immune. 



On the red currant the mildew affects the stalks and blades of the leaves more 

 severely than the stems, while on the gooseberry the reverse occurs. Perithecia 

 were abundantly developed on the mildewed leaves of the currants, indicating 

 that the fungus could live over to another season. 



