PESTS OF ORCHARD AND FRUIT GARDEN. 



35 



irregular, brown then purplish, sprinkled with the minute dots of the 

 innate conceptacles which are covered by the cuticle, which are exceed- 

 ingly small, with a minute pore at the apex, through which the mature 

 spores are ejected in a roseate tendril. The spores, or conidia, are very 

 long and thread-like, curved, containing a row of guttules (50 /u long). 



In common with most kinds of leaf- spot, this affection is treated 

 generally with great indifference, the general impression being that it 

 only affects the leaf upon which it grows, and does not in any way 

 influence the general health of the bushes. 



Known in France, Germany, and the United States. In New Zealand 

 it is known as the Gooseberry rust. " After the crop is off Bordeaux 

 mixture may be used, and should be again applied, full strength, before 

 the buds break, early in the following season as a preventive. All leaves 

 to be raked up and burned." 



Sacc. Syll. hi. 2649 ; Cooke Hdbk. No. 1338 ; Grevillca, xiv. 76 ; 

 Journ. B.H.S. xxv. (1900), p. 143, fig. 



Currant Bleached Spot. 

 Plujllosticta 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 /u 

 long). 



Sacc. Syll. iii. 82. 



Gooseberry-leaf Spot. 



Plujllosticta grossularice (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 (5-6 x3 ^). 



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- 

 less. 



Sacc. Syll. iii. 83. 



Another Gooseberry leaf-spot (Ascochy ta (jrossularicz) is known in 

 Europe with apparently two-celled conidia. 



Currant Anthracnose. 



Glceosporium ribis (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 Red 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 



D 2 



