FUNGOID PESTS OF CULTIVATED PLANTS. 



143 



on Beech trunks and occasionally on fruit trees. All such fungi should 

 be cut away and the wound dressed with gas tar. (Fig. 20.) 



V 





» < *-». '•« 



Fig. 20. — Fomks fomentabius. 



The woodcut is not by any means a good characteristic figure. 

 Sacc. Syll. Hym. ii. 5409 ; Cooke Hclbk. No. 776 ; Joum. B.H.S. 

 xxvi. (1902), p. 734, fig. 308 ; Mass. PL Dis. 185, 392. 



CURRANT-LEAF SPOT. 



Septorid JRibis (Desm.), PI. XII. fig. 31. 



This spot appears to be confined to the living leaves of the Black 

 Currant, and is certainly common enough. The spots are small and 

 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 iii. 2849 ; Cooke Hclbk. No. 1338 ; Grevillca, xiv. 76 v 

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



