356 Report of the Mycologist of the 



the author of that article, istates that he found the fungus on 

 cucumber leaves growing under glass at New Brunswick, N. J. 

 Subsequently, he reported* that it had been found abundantly in 

 various parts of New Jersey in 1889, not only on forced cucum- 

 bers but also on squashes, pumpkins and field-grown cucumbers. 

 In the Botanical Gazette for August, 1889, Dr. Farlow gave a de- 

 tailed account of the fungus and stated that it had been found in 

 Japan a few montbs before by Prof, Miyabe. In the same year, 

 1889, Prof. Gallowayt reported having received specimens from 

 Anona, Fla., and College Station, Texas, in both of which locali- 

 ties it was abundant. 



In 1890 Dr. Humphreyt studied the fungus at the Massachu- 

 setts Experiment Station. He made the first drawings of the 

 spares§ and sporophores, and the hyphae penetrating the cells of 

 the leaf; and because of the manner in which the spores ger- 

 minate he changed the name to Plasmopara cuhensis. 



Following this, the fungus was reported from various parts of 

 the country. It began to do serious injury to muskmelons and 

 watermelons, and has now become so injurious to cucumbers and 

 melons that it must be placed in the front rank of destructive 

 fungous diseases. According to Ludwig|| it has not yet been 

 found in Europe. 



It is a curious freak of nature that a fungus which had not 

 been observed for twenty years should appear almost simulta- 

 neously in two widely sepai-ated portions of the earth and so 

 suddenly spring into prominence as a destructive disease. 



AN EXPERIMENT ON THE PREVENTION OF THE DIS 

 EASE BY SPRAYING WITH BORDEAUX MIXTURE. 

 In the season of 1896, the Station made arrangements with Mr. 



R. C. Oolyer, of Woodbury, N, Y., to make a spraying experiment 



• Halsted, B. D. Some Notes upon Economic Peronosporeae for 1889 In New Jersey. 

 Journal of Mycology, Vol. V., p. 201. 



t Galloway, B. T. New Localities for Peronospora Cubcnsis. Journal of Mycology, Vol. 

 V, p. 216. 



J Humphrey, J. E. Eighth Ann. Kept. Mass. Agl. Exp. Sta., 1890, pp. 210-212. 



§ He did not, however, illu.strate the germination of the spores although he distinctly 

 states that the method of germination is by zoospores and because of this character 

 places the fungus in the genus Plasmopara. Dr. Halsted, also, has observed that the 

 germination is by means of zoospores, but no one has ever flgured them. 



II Ludwig, F. Lebrbuch der Niederen Kryptogamen, p. 150. 



