MiCROSPHAERA • 159 



M. 



America it attacks several other species of Ribcs^ and also, very 

 frequently, Sa))ibuciis Canadensis and S. raccniosa. 



Professor Miyabe has sent me specimens on Sambticns racauosa 

 van pnbesccns from Japan. This is the first record of the occur- 

 rence of the species in Asia. 



In Europe M. grossnlariae sometimes occurs in such quantities 

 on cultivated crooseberries as to cause a disease. In the Journal 



t> 



of the Board of Agriculture for 1898 (184) it is reported that this 

 disease was very troublesome in England during that year, caus- 

 ing the leaves of the gooseberry-bushes affected to shrivel and fall 

 off The following notes on prevention and remedies are given : 

 '' The leaves from infected bushes should be raked from under them 

 and burnt. . . Any dead leaves remaining on infected trees should 

 be picked off and burned, as far as possible. Where there is a 

 sign of infection the leaves should be dusted thoroughly above 

 and below with very finely powdered sulphur put carefully on w^th 

 a knapsack powder-distributer on a still, hot, sunny day. Sul- 

 phide of potassium diluted with water in the proportion of 2^ oz, 

 of sulphide to five gallons of water, and sprayed over and under 

 the leaves in a fine spray, has been found to be efficacious. This 

 dressing should be applied very early when the leaves are small 

 and young, and should be repeated in about sixteen days.'' 

 Bordeaux mixture, composed of 3 lbs. of sulphate of 



coppe 



%d 



when the foliage is strong and fully developed, composed of 4 lbs. 

 of sulphate of copper and 4 lbs. of lime to the same quantity of 



water, is also recommended. 



'The American " gooseberry mildew," which attacks chiefly the 



berries, is Sphacrothcca inors-nvae. 



6. M. MouGEOTii Lev. [Figs. 59, 60] 



M. Moiigeotii Lev. Ann. sci. nat. IIL 15; 15S. //. 9. / -V (sub 

 Calodadid). 1S51; Cooke, Micr. Fung. 219. 1865; Cooke 



Handb. Brit. Fung. 2 : 649. 1871. 



Erysiphe Mougeotii de Bary, Beitr. Morph. Phys. Pilz. i ; 



xiii. 52. 1870. 

 Podosphaera Mougeotii (Lev.) Quel.' Champ. Jur. Vosg. 3 : 



106. 1875. 



