VENTURIA 



207 



infected by spores produced on the leaves. But the leaves 

 could not become infected except by spores produced on 

 diseased shoots, consequently diseased shoots are the source 

 of all the mischief, hence the most natural thing to do 

 under the circumstances is to remove and burn all such 

 diseased shoots. This is what I have advocated, but I have 

 been told by a professor of mycology and a professor of 

 agriculture independently, and in public, that this is not 



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FIG. 58. Venttiria inaequalis. r, conidial stage (Fusicladium dendriti- 

 cum} on apple leaf; 2, 3 and 4, conidial stage; 6, section of perithecium 

 ( Venturia stage) ; 7 and 8, asci and spores of Venturia ; 9, apple twig with 

 Fusicladium stage, as appearing during winter and spring. Figs, i and 9 

 reduced ; remainder highly mag. 



practicable. I am not convinced. I believe that it is as 

 practicable to remove the dead shoots from a tree as it is 

 to remove the apples, in fact the Director of the Research 

 Laboratory at Wisley informs me that, out of a batch of 

 badly, diseased apple-trees, those that had all diseased shoots 

 removed, but not sprayed, produced a much cleaner crop 

 of fruit than those that were persistently sprayed, but had 

 not the diseased shoots removed. 



Cut away all diseased shoots just below the point of the 



