54 EXPERIMENT STATION RECORD. [Vol.41 



bud showed less injury than the lower buds. On young trees injury was less 

 severe wliere less growth was made, so that immaturity does not appear to have 

 favored frost injury. Bud killing does not appear to be due to second growth 

 following high temperatures. A relation was noted between injury and size 

 of buds or relative development, which is supposed to bear an important rela- 

 tion to the size of the leaf subtending the bud. These observations are regarded 

 as preliminary. 



Brown rot on peaches, M. A. Blake and C. H. Connors (New Jersey Stas. 

 Rpt. ion, pp. 81, 82, pi. 1). — Tlie authors report the occurrence of brown rot of 

 peaches in central and southern New Jersey, from 25 to 50 per cent of the blos- 

 soms being destroyed in some instances. In addition to the attack on the blos- 

 soms, the twigs were killed in numerous cases, the trees having the appearance 

 of being affected by twig blight. 



Peach leaf curl and how to control it, J. T. Bkeggek (Better Fruit, IS (1918), 

 No. 5, pp. 16, 17). — The author states that Bordeaux mixture at winter strength 

 (6:6:50) is satisfactory for control of peach leaf curl, and that lime-sulphur 

 (1:8) will control leaf curl and San Jose scale when that pest is present. 



Peach yellows and little peach at Vineland, M. A. Blake and C H. Connors 

 (New Jersey f<tas. Ept. 1911, pp. 88-92. pi. 1). — A report is given of the number 

 of trees lost in some test orchards from 1909 to 1917. The authors state that 

 no tree has yet become diseased that had been planted in the spot from which a 

 diseased tree had been removed, and trees replanted in the earlier years are now 

 bearing. The immediate removal of any tree as soon as the first symptoms of 

 the disease appear is strongly advised. 



[Grape disease control and weather, 1917 and 1918] L. Ravaz (Prog. Agr. 

 et Vit. (Ed. VEst-Centre), 39 (1918), No. 18, pp. 409-^18, figs. S; abs. in Rev. 

 Set. [Paris], 56 (1918), No. 15, p. 467). — Noting principally observations made 

 during the mildew outbreaks of 1917 and 191S, the author states that the 

 almost perfect constancy of the time period between a given precipitation and 

 the consequent appearance of infecting mildew spores (exactly seven days 

 at Montpellier in 1917), permitting practically perfect control of this disease, 

 is due to the well-established relations which obtain between atmospheric tem- 

 perature and humidity. Brief notes are given on other subjects, as lime-sulphur 

 mixtures and a sulphuric acid solution found effective against black rot. 



Outbreaks of grape downy mildew in the southwest of France in 1916, 

 J. Capus (Mill. Agr. [France], Ann. Serv. Epiphyties, 5 (1916-17), pp. 193- 

 200). — This account, which is in much more condensed form than that pre- 

 viously employed by the author (E. S. R., 3G, p. 650), gives briefly data as to 

 atmospheric conditions and other influences in connection with grape downy 

 mildew and describes the 1916 outbreaks of this disease. 



Comparative value of acid and alkaline copper spra.ys for the treatment 

 of grape downy mildew, J. Capus (.1/ih. Agr. [Franee], Ann. Serv. Epiphyties, 

 5 (1916-17), pp. 201-209).— This work, previously noted (B. S. K., 40, p. 158), 

 showed that acid sprays are equally efficacious and immediate in effects as 

 those of alkaline sprays under different atmospheric conditions. Bordeaux 

 mixture having 2 per cent copper and 8 per cent lime was equal to standard 

 Bordeaux in all respects. Conidia deposited on surfaces which had been sprayed 

 but afterwards deprived by rainfall of copper deposits gave rise to zoospores. 

 The basic .sprays were more lasting in their effects than the acid sprays. 

 The durability of acid or of alkaline sprays appears to be due not to the com- 

 position so much as to the degree of spreading or the degree of covering the 

 surface, the deposit in case of alkaline sprays remaining practically continuous 

 longer than in case of acid sprays. 



