346 EXPERIMENT STATION RECORD. 



and attention is called to various means that have been tried to combat it. 

 These include the destruction of the affected foliage, spraying and fumfgating 

 diseased plants, the influence of location on the disease, resistant varieties, etc. 



Spraying was found to be effective under certain conditions, but it is often so 

 expensive as not to be economically advantageous. Liberian coffee and some 

 Java and other hybrids seem to be quite resistant, so far as the author's investi- 

 gations have been carried. Improved culture seems to be valuable in rendering 

 the plants less liable to injury. Where Arabian varieties are grown, the plant- 

 ings should not be made in situations where there Is too great humidity and 

 heat. The trees should be artificially irrigated where there is a lack of rain- 

 fall, selection made of vigorous plants from the nursery, and attention paid 

 to the choice of fertilizers and the keeping down of weeds. 



An effective treatment for grape anthracnose, C. P. Lounsbury (Agr. Jour. 

 Cape Good Hope, 29 (1906), No. 1, pp. 29-35, pfj. i).— After briefly describing 

 grape anthracnose, due to Gloeoi^porimn aiiipclophagum. the author calls 

 attention to the varying susceptibility of different varieties to this disease 

 and points out the almost complete resistance of a number of forms. For 

 the prevention of the disease winter treatment with an acid solution of 

 iron sulphate is recommended, and an account is given of experiments in 

 which a vineyard was treated with this solution. Vines that had suffered 

 sevei'ely the year before, when given the treatment bore a heavy crop of 

 fruit and but occasional evidences could be found of the presence of any 

 disease in the vineyards. 



Investigations on the development of Botrytis cinerea, J. M. Guillon 

 (Couipt. Rend. Acad. f^ci. [I'ari.^]. l',2 {1906), \o. 2',, pp. 13.',6-13J,9) .—The 

 author has studied the development of Botrijti.^ cinerea, which causes the 

 gray rot of grapes, and has endeavored to ascertain its method of rapid 

 spreading. 



Inoculation experiments made upon wounded grapes showed that the spores 

 develop rapidly and in from 36 hours to 3 days are able to cause a pronounced 

 infection. In other experiments it is shown that the Botrytis developing 

 normally in contact with uninjured grapes is able to penetrate the epidermis 

 of the fruit and set up an infection within a relatively short time. It is 

 also found that the fungus l>y its mycelium is able to spread from place to 

 place, so that grapes not inmiediately in contact are readily infected, even 

 if the spread of the spores by means of the air should be disregarded. 



Notes on the grape powdery mildew, P. Pacottet (Rev. Tit., 26 {1906), 

 No. 6-')5, pp. 9-13). — Attention is called to the perithecial phase of the powdery 

 mildew. 



The author believes that the ])erithecia are formed annually in France 

 in different places and that they play a very important part in the spread 

 of the disease. A number of localities are mentioned in which the perithe- 

 cial stage is commonly produced, and there seems to be indicated a direct 

 relationship between the autumnal temperature and rainfall and the develop- 

 ment of the perithecia. For the prevention of the destructive spread of the 

 disease, attention to these centers is recommended and the perithecia destroyed 

 as far as possible. 



Combined treatment against downy and powdery mildew, L. Vernet 

 (Prog. Agr. et Tit. (Ed. nj^t), 27 (1906), No. 19, p. 557).— For combating 

 these 2 diseases of grapes the author recommends spraying with a 2 per cent 

 solution of Bordeaux mixture, 4 applications to be given the vines, and it is 

 suggested that immediately following the first and third applications the 

 vines be dusted with a mixture of equal parts of sublimed sulphur and 



