272 EXPERIMENT STATION RECORD. 



Grape mildew, J. Dufouk {Chron. Agr. Canton Vaud, 16 [1903), Xo. 11, p. 485).— 

 Till' author notes an unusual prevalence of grape mildew in many localities, and 

 states that various treatments which have been recommended have jriven very un- 

 equal results. In order to study the (question more fully a circular has Vjeen widely 

 distributed from tiie experiment station at Lausanne asking for rej>orts on the results 

 of different methods of treatment. It is hoped from the data thus collected that 

 some i>ositive recommendation can be made for combating this disease. 



Treatment of gray rot, E. Combemale {Prog. Agr. et Vit. {Ed. L' Est), 24 {1903), 

 No. 31, pp. 138-140). — The author claims to have successfully used against Botry- 

 tu cinerea a mixture of triturated sulphur 50 kg., powdered quicklime 25 kg., and 

 eulpho-steatite 25 kg. By the use of this mixture a considerable saving is effected 

 over the ordinary use of triturated sulphur. The author uses this powder alone or 

 as supi^lementing treatments of Bordeau mixture, in which case he has given 2 or 3 

 applications of the powder to .'> or 4 of the Bordeau mixture. 



Treatment of gray rot of grapes, V,. Zacharewicz {Prog. Agr. et Vit. {Ed. L'Est) , 

 24, {1903), Xo. 32, pp. 167, 168. ) — A description is given of a method of treatment of 

 grapes for the prevention of attacks of Botrytis cinerea which has been successfully 

 used by the author for a number of years. This consists of thorough application 

 immediately after the first evidence of the disease of a powdered fungicide which 

 consists of a mixture of gypsum 55 kg., powdered soap 5 kg., and sulpho-steatite 

 containing 20 per cent copper sulphate 40 kg. 



Combating- grape chlorosis, G. Mottakeale {Bol. E. Scuola Superiore Agr. Por- 

 tici, 2. ser., 1902, Xo. 6, pp. 3). — An account is given of grape chlorosis, which is 

 particularly destructive to the American stock used in Europe as a means of prevent- 

 ing phylloxera. The author summarizes the resistance of different stocks to chlorosis, 

 and for the prevention of the disease he suggests treatment early in the spring by 

 washing the vines with a 10 to 15 per cent solution of iron sulphate, by spraying the 

 vines later in the season with a 0.5 to 1 per cent solution of iron sulphate, or by a 

 third method, which is considered perhaps the most efficient-, washing the vines after 

 the fall of the leaves in autumn with a strong solution of iron sulphate to which is 

 added 40 per cent sulphuric acid. If the treatment is neglected until later in the 

 season it may be given the vines in January or a little later, but in this case the 

 amount of suli^huric acid should be reduced to not more than 25 per cent. 



Tlie effect of sulpliuric acid in retarding tlie grovrth of vines, J. I). Catta 

 {Prog. Agr. et Vit. {Ed. L'Est), 24 {HM3), Xo. 12, pp. .?,56-J.5<?).— Attention is called 

 to the use of weak solutions of sulphuric acid as a winter wash for grape vines 

 to prevent attacks of anthracnose. This has been recommended for a number of 

 years, and dilute sulphuric acid, without the addition of iron sulphate, is exten- 

 sively used in Algeria. It is shown that it exercises an important effect iu retarding 

 the early development of buds on the vines, and thus protects them from late spring 

 frosts. The author has used solutions of sulphuric acid containing from 10 to 12 per 

 cent of the acid upon grapevines, with the result that they were retarded in their 

 develojjment aV)out 15 days. Where a weaker solution was used the vegetation was 

 arrested 7 or 8 days. 



A disease of clematis, F. Morel {Rev. ITort. [Pan'.s], 75 {1903), Xo. 15, pp. 364, 

 365). — A description is given of a disease of clematis which hasbeen variously attrib- 

 uted to improper cultivation, nematodes, fungi, etc. The author is convinced that 

 it is of bacterial origin. The first indication of the presence of the disease may be 

 noticed in the small openings which form in the stems, and these seem to spread 

 with the increased humidity and temperature. Later a ring a few millimeters across 

 is formed about the stem, when the plant dies beyond this infested region, while 

 below it it does not seem to be injured. On account of the definite formation of these 

 zones about the stem near the ground, the author does not believe that the disease 

 is due to the nematodes, but that it is caused by bacteria which find entrance into 



