172 EXPERIMENT STATION RECORD. 



Associated with it is another fungus (Oyctoconiumoleaginum). For combating these 



2 diseases the author recommends treating the olive trees with a mixture composed 

 of soap 1 kg., kerosene 4 liters, copper sulphate 1 kg., and water to make 100 liters. 

 Directions are given for the preparation of this compound insecticide and fungicide, 

 and notes are given on its efficiency, cost, etc. 



The sooty mold of the olive, Chapelle (Bui. Dir. Agr. et Com. [Tunis], 9 (1904), 

 No. 31, p. 223). — The author reports a successful treatment of olive trees for protec- 

 tion against sooty mold by spraying them with a strong Bordeaux mixture to which 

 was added "Nicotine." This was sprayed over the trees 3 times during the season, 

 and is said to have been very efficient in removing the fungus. 



A new species of fungus-producing canker on cacao trees, A. Hempel (Bol. 

 Agr. Sao Paulo, 5. ser., 1904, No. 1, pp. 22-24)-— A technical description is given of 

 Colonectria bahiensis, a new species of fungus which has been recently recognized in 

 Bahia, Brazil, as parasitic on the trunk of the cacao tree. In addition to this species 

 brief notes are given on C. flavida, which occurs in Trinidad and other portions of the 

 West Indies, and on Neclria theobromse, both of which are quite injurious to cacao 

 cultivation. 



A new method for the treatment of black rot, J. Ducos (Prog. Agr. et Vit. 

 (Ed. L'Est), 25(1904), No. 27, pp. 11-13). — An account is given of a preventive treat- 

 ment of grapes against the black-rot fungus. The author has for a number of years 

 been pursuing a plan which, in brief, consists of spraying the vines at the time 

 when the fungus is making its successive appearances. 



In order to determine the time for spraying a few plants are left unsprayed, and 

 whenever the spots caused by the fungus are observed on the leaves the other vines 

 are thoroughly sprayed with a rather strong Bordeaux mixture. As a preliminary 

 to the treatment of the vines, they are given 2 sprayings with either copper sulphate 

 or strong Bordeaux mixture before the appearance of the leaves. In this way the 

 author claims to have prevented attacks of black rot with 5 sprayings in 1902 and 4 

 in 1903. 



The treatment is said to have also been efficient in preventing the occurrence of 

 the downy mildew. 



The occurrence of black rot in Marmandais, A. Guy (Prog. Agr. et Vit. (Ed. 

 L'Est), 25 (1904), No. 22, pp. 663-665). — A report is given of investigations on the 

 dates of appearance of the black-rot fungus in the vineyards of Marmandais. Various 

 dates are cited as to the time of the first observation of the fungus, and data are given 

 regarding the time of first applications of fungicides for the protection of the vines 

 from this disease. 



The first application of fungicides should be made between April 26 and May 2. 

 The example is cited of a vineyard in which an early spraying was given, followed 

 by other applications during the season at intervals of about 8 days, resulting in 

 almost total absence of the disease. 



The treatment of chlorosis of grapes in calcareous soils, L. Vernet (Prog. 

 Agr. et Vit. (Ed. L'Est), 25 (1904), No. 13, pp. 3S5, 386). —The usual treatment for 

 chlorosis by which iron sulphate is added to the soil is said to be most too slow in its 

 action, and the author proposes a treatment in which there is combined action of the 

 iron salt and a decalcification of the soil. 



The method of treatment described consists of the addition of 10 kg. of commer- 

 cial sulphuric acid to about 160 liters of water, and to this is added 10 kg. of sulphate 

 of iron, which is suspended at the surface of the liquid and gradually dissolved. 

 After solution and thorough mixing this is poured about the vines at the rate of 

 about 2 liters to each vine, care being taken to bank up the earth about the grape 

 vine to protect it from direct injury. 



The treatment of gray rot of grapes by hydraulic lime, G. Marais (Prog. 

 Agr. et Vit. (Ed. L'Est), 25 (1904), No. 24, p. 704).— The author reports having sue- 



