THE AMEEICAN GOOSEBEKRY MILDEW IN IRELAND. 779 



European Gooseberries in this country is their susceptibility to attacks 

 of the mildew, Sphcerotheca mors-uvcB. From the standpoint of the 

 American fruit-grower Gooseberries fall into two classes, those which 

 suffer from the mildew and those which do not. The former class includes 

 all European varieties and their American-grown seedlings, or, in other 

 words, all varieties of the species Bibes Grossularia, L. The latter class 

 includes the cultivated varieties of the native American species oxyacan- 

 thoides, L., and Gynoshat% L., and some hybrids between them and the 

 European species. On account of their liability to serious attacks of 

 mildew, European Gooseberries should not be planted for commercial 

 purposes, except by those who are prepared to contend with that 

 disease." 



We may infer from these observations that, if the present fungus were 

 to become widespread in Europe, the whole Gooseberry crop would be 

 seriously affected. I have already, in my previous article, given notes on 

 the best fungicides to use against the disease, and to these the following 

 remarks by Beach on this subject may be added : " Spraying to prevent 

 mildew should begin as soon as the buds begin to unfold, using one ounce 

 of potassium sulphide for every two gallons of water. Repeat the appli- 

 cations at intervals of ten days till the fruit is nearly ready to market. 

 Should frequent heavy rains occur, spray more frequently. Be sure the 

 spray reaches all the foliage, especially on the inner and under parts of 

 the bush, which are usually slighted. The use of Bordeaux mixture is 

 objectionable, because it is apt to stick to the fruit and injure its market 

 value, even though the application be made several weeks before the crop 

 is marketed." 



BIBLIOGRAPHY. 



1. Magnus, P., " Weitere Mitteilungiiber den Meltau einiger Obstarten " 

 {Gartenfl., 1., 412-414, 1901). 



2. Salmon, E. S., "A Monograph of the Erysiphacece,'' p. 72 (Mem. 

 Torrey Bot. Club, ix., 1901). 



3. De Wildeman, E,, and Durand, Th., " Prod. Fl. Belg.," Thallo- 

 phytes, fasc. 2, 219 (1898). 



4. Beach, S. A., " Gooseberries " (in Ne2c York Agric. Exper. Station 

 Bull. No. 114 (1897) ). 



