144 FUNGOID PESTS OF CULTIVATED PLANTS. 



CURRANT BLEACHED SPOT. 



Phyllosticta ribicola (Fr.). 



The spots are sometimes found on the leaves of the Red Currant, and 

 are rather large and bleached, with a number of minute black conceptacles 

 scattered over the surface like pin-points. 



The conidia are simple and small, oblong and colourless (15-17 /* 

 long). 



Sacc. Syll. iii. 82. 



GOOSEBERRY-LEAF SPOT. 

 Phyllosticta Grossularia (Sacc.). 



The spots on the leaves of the Gooseberry are similar to those on the 

 leaves of the Currant, but smaller, and with a circumscribing brown line. 

 They differ also in the smaller sporidia, which are not more than one third 

 the length of the foregoing (5-6x3 p). 



This species is known in most parts of Europe and also in North 

 America, but is treated as though it were regarded as practically harm- 



9. 



Sacc. Syll. iii. 83. 



Another Gooseberry leaf-spot (Ascocliyta Grossularice) k known in 

 Europe with apparently two-celled conidia. 



CURRANT ANTHRACNOSE. 

 Glwosporium Eibis (Lib.), PI. XII. fig. 32. 



Although this species of leaf-spot is tolerated without complaints, it is 

 sufficiently common, but not so injurious as most species of Anthracnose. 

 It generally affects the leaves of the Bed or White Currant, on which it 

 produces circular spots, sometimes confluent, and wholly brownish in 

 colour. The pustules appear on the upper surface of the spots, concealed 

 beneath the cuticle, being somewhat flattened and of a darker reddish - 

 brown externally, but whitish within, and without any true conceptacle. 

 The mass of spores is whitish, and is ejected when mature through a 

 central opening in the cuticle. The conidia, or sporules, are oblong and 

 curved (10x5 p). In wet weather they may be seen oozing out in a 

 tendril through the aperture in the cuticle. 



It is bad policy to treat any of the species of Anthracnose with con- 

 tempt, seeing that they may give trouble at any time should a favourable 

 season occur ; and it has proved to be very far from harmless in the 

 United States, where the remedy recommended is spraying with one of 

 the copper solutions. 



Sacc. Syll. iii. 3694 ; Mass. PL Dis. 286 ; CooJce Hdbk. No. 1235. 



Glaosporium curvatiim, known in Holland on Black Currant leaves, 

 has larger conidia (14-20 x 5-7 /i). 



