10 JtJLY, 1917.] Aiithracnose or Black Spot of the Vine. 415 



Spri)Utiii<; and sponilatioii are then described in detail. I'sually the surface 

 cells tliriivv out spore bearing filaments (see Figs. 10, 11, and 12) 

 tender central cells car ' ' ' " 



but the more 



Ills tnrovv out spore uenring niamenis (see rigs, lu, ii, ana ij), Dui me more 

 nder central cells can also produce spores if through any cause, such as breaking 

 or splitting of the sclerotium, they become exposed. We have also proved that 

 the non-condensed mycelium in the interior of the tissues can also emit s""-"- 

 bearing filaments. Tlius does the Anthraenose fungus perpetuate itself •' 



spore- 

 in spring. 





^=irTv, 







f&o'nt^ontm- 



Fig. 14. 

 Section of a scar in winter ( x 200), showing a sclerotium 

 o, o, lining the greater part of a fissure cavity — it is now dor 

 mant; /), mycelium of fungus; A, A, streaky markings in the 

 damaged tissues. After Viala and Paccttet. 



,_V- " ■ frr-'i^^^ - ^^'"^jT^? — 



I ,7^ 



■^' 



j:>^''-f~ <-~'>j,-~v 





■".^^^ 



Fig. 15. 

 Section made in spring of a similar fissure to that in Fig. I'l 

 (X 200), showing germination of the sclerotium; this throws out 

 from its whole surface an immense number of conidiophores or 

 filaments which bear summer spores or Conidia n. ii. .\ftei 

 Viala and Pacottet. 



The only treatments which seem to lie really cfricacious are preventive ones. 

 As completely as possible the whole fungus must be destroyed. Tliis can scarcely 

 happen with the usual iron sulphate sohiticm, or even with copper sulphate. In 

 our tests -we swal>l>cd a number of vines with the following solutions: — Sulphate 



