546 EXPERIMENT STATION RECORD. [Vol.36 



Downy mildew on direct bearers, S. Obiedoff, J. Baqtjeeo, and D. V. 

 Pehlivanoglou (Ann. Ecole Nat. Agr. Montpellier, n. ser., J 4 (1915), No. 4, PP- 

 282-322, fiys. 2). — The authors have made very extensive observations regarding 

 the degree of mildew attack on direct bearer vines of several species and 

 numerous varieties in the collection of the School of Agriculture at Mont- 

 pellier. The results are tabulated and discussed at greater length than in the 

 account previously noted (E. S. R., 35, p. 352). It is admitted that no ideal 

 direct producer uniting the comparatively high but not complete resistance 

 shown by American viiies with the flavor of product and adaptability character- 

 izing French vines has been found to exist in that collection. 



Variations in the resistance of grape to downy mildew, L. Ravaz and S. 

 Obiedoff (Ann. Ecole Nat. Agr. Montpellier, n. ser., 14 (1915), No. 4, Prog. Agr. 

 et Vit. (Ed. VEst-Centre), 37 (1916), No. 19, pp. Ul-W, figs. 6, pp. 255-263, figs. 

 6). — Having observed a more marked attack on grape blooms than on peduncler-, 

 the authors made a study of the numbers of stomata, supposedly the onl> 

 points of invasion by the fungus. 



The stomata were found to be more numerous in the case of the more resistant 

 American vines. Stomatal numbers are considered to be unimportant as a 

 factor determining susceptibility to mildew attack, which appears to depend 

 upon conditions within the tissues themselves. 



Powdery mildew of grapes and its control in the United States, D. Reddick 

 and F. E. Gladwin (Off. Rpt. Scss. Internat. Cong. Vit., 1915, pp. 117-125).— 

 This paper relates mainly to experience during 1911 to 1914 with fungicides 

 differing in form, composition, and mode of application in the grape belt in 

 Chautauqua County, N. Y. The tests with powdered sulphur yielded results 

 which were inconclusive, necessitating their repetition with modifications. 



Leaf spots on vines, W. H. Dobson (Oard. Chron., 3. ser., 59 (1916), No. 1534, 

 p. 267). — Discussing in a preliminary note the work of previous experimenters 

 in connection with his own recent work on leaf spot of grapevines, the author 

 concludes that boron in the soil is probably the cause of the disease. 



Chlorosis of pineapples induced by manganese and carbonate of lime, P. L. 

 GiLE (Science, n. ser., 44 (1916), No. II46, pp. 855-857). — Attention is called to 

 experiments carried out by M. O. Johnson, of the Hawaii Experiment Station, 

 for the control of chlorosis of pineapples on highly manganiferous soils by 

 spraying the leaves with ferrous sulphate. The author points out differences 

 between this form of chlorosis and that described by him in Porto Rico as in- 

 duced by carbonate of lime (E. S. R., 26, p. 121). These differences lead him 

 to believe that the manganese chlorosis may be due in part to a deficiency of 

 iron in the plant caused by the action of manganese in the plant or in the soil, 

 and in part to a direct toxic effect of manganese, while the lime-induced 

 chlorosis is supposedly caused by a lack of iron in the plant due to carbonate 

 of lime's diminishing the availability of iron in the soil. It is stated that these 

 two kinds of chlorosis may be found essentially the same, except for certain 

 secondary effects produced by an undue absorption of manganese. 



The causes of unnecessary decay in lemons, R. L. Wilhts (Mo. Bui. Com. 

 Hort. Cal., 5 (1916), No. 6, pp. 213-216). — This Is a discussion of experiences in 

 the growing, picking, and packing of lemons with reference to losses from 

 diseases due to injury and from infection in the soil. Emphasis is placed on 

 a strict organization of the work with a view to locating and minimizing injury 

 to the fruit. 



Overwintering of Oidium parasitic on Photinia serrulata, V. Peglion (Atti 

 R. Accad. Lincei, Rend. CI. Sci. Fis., Mat. e Nat., 5. ser., 25 (1916), I, No. 5, pp. 

 341, 342). — A brief account is given of a fungus described in part which, in 

 the conidial stage here noted as parasitic on P. serrulata, presents considerable 



