748 EXPERIMENT STATION RECORD. [Vol.40 



adhesiveness superior to that of Burgundy in all cases and to that of Bordeaux 

 in most cases. Bordeaux was somewhat superior in every case but one to 

 Burgundy mixture. In every case the ultimate deposit was in the form of a 

 carbonate of copper. In case of Burgundy the eopper was deposited initially 

 as carbonate and in the other two mixtures as basic sulphate, which was con- 

 verted into carbonate, such conversion implying supposedly a much finer and 

 a more adherent deposit. The superiority of Bordeaux over Burgundy in this 

 respect is, however, reduced by the presence of particles of excess lime, which, 

 owing to their size, are easily removed from the leaf surfaces, carrying with 

 them some of the copper and reducing its adhesiveness nearly to the level of 

 that of Burgundy. 



Potato spraying for farmers, B. S. Salmon {Jour. lid. Agr. [London], 24 

 (1917), A r o. 5, pp. $65-274, pis. J).— This article, intended for practical potato 



growers, contains an a< ant of spraying experiments carried out on the farm 



at Wye College for several seasons demonstrating the benefit to be derived 

 from tbe proper preparation and timely use of Bordeaux and Burgundy mix- 

 tures for potato late blighl (Phytophthora Infestana). These sprays are con- 

 sidered superior to dust sprays in seasons of severe blight attack. 



Diseases of tomatoes, M. T. Cook and W. II. Mvkiin (Fete Jersey Shis. Circ. 

 iO'i [19181, pp. 15, figs. 6). Descriptions are given of some of the more common 

 tomato diseases, and BO far as definite means are known, control measures 

 are suggested. 



Damping-off and collar rot of tomatoes, C. T. Stinks (I'nir. Bristol, Ann. 

 Rpt. Agr. and Wort. Research sin.. 1917, pp. 95 B7). A damping-off and collar 

 rot of tomatoes grown under glass has recently received serious attention, as 

 a result of which it is stated thai the two diseases differ only as regards the 

 age at which the plants are Infected. There is thus only one disease in ques- 

 tion, and most of the observations apply to attacked plants of all ages. 



The causal organism Is evidently a Phytophthora, though no form of fructi- 

 fication has been found except spoiw nL'ia. the organism not having been 

 grown in pure culture. The Infection is thought to persist year by year in tbe 

 soil unless removed by sterilization, though the possibility of its transmission 

 by means of water is qo1 exi luded by the results of observations noted. 



Fungus diseases [of fruit trees], H. W. I'wiy (Jour. I>< ;,t. \<ir. Victoria, 16 

 (1918), No. 2, pp. I0'f-107). — These notes discuss apple black spot or scab, stone 

 fruit shot bole, peach enrl, root rot ( Annillaria >. citrus collar rot, and 

 chlorosis, with a discussion of fungicides appropriate to these di-eases and 



the preparation and use of Bordeaux mixture and iron sulphate 

 Silver leaf disease, P. S. Hatwabd (Oard. Chron., S. wr., 6', (1918), An. 



1659, p. I'/S). Cases of Silver leal ><\' fruil trees are noted as having arisen 

 apparently as a result of traumatism or of Imperfect union between stock and 

 graft and as having extended both upward and downward. No organism was 

 found in this connection. The course of the disease was marked by silvering 

 of the foliage, partial development of the fruit, deficiency of growth, and 



death of the branches and finally tbe tree. Poor drainage and acidity of tbe 

 soil may be involved. 



Black spot of pear, J. G. Veaix (Jour. Agr. [New EeaL], U (1918), No. 5. pp. 

 2ss.>'.)i). fit), l). — Giving the results of orchard experience, the author states 

 that after a bad attack in 1915, owing to neglect of spraying, the use in 1916 

 of a winter 10:10:40 Bordeaux application and of a I: 1:40 strength after 

 the fruit had set Improved the pear crop considerably. Tests in 1917 of a 

 winter 8:6:40 Bordeaux, a pink spray at 6: 1:50, and a strength of B:4: 10 

 with the first arsenate spraj gave some good fruit in spite of t lit* general failure 



