3i6 



The Canadian Horticulturist. 



growth of the parasite. It is thought that the fungus continues its Hfe and 

 completes its development upon the same leaves which it first attacks, after 



they are fallen to the ground. The 

 spores produced on the old leaves in 

 the spring, serve to propagate the 

 fungus during the new growth of the 

 parts which it infests. 



All infested leaves are more or less 

 discolored with the purple or brown 

 spots mentioned above, or they may 

 turn before falling to a clear yellow 

 color. In figure 70 is shown a leaf of 

 the cherry attacked by this fungus, ex- 

 hibiting a spotted appearance, a por- 

 tion of which has become discolored 

 through the action of the parasite upon 

 the leaf tissue. Figure 71 represents a 

 highly magnified section through the 

 leaf including one of the spore capsules ! 



FIG 71.— MAGNIFIED SECTION OF CHERRY LEAF 1 , ahoVP ATP «;hnwn t^OTTlP of thp 



SHOWING FUNGUS CAUSING LEAF-SPOT DISEASE ; «, '1"*^ '*'■ "> d-UUVC, d.lti bUOWU bOme OI IHC 



FOUR SPORES MORE HIGHLY MAGNIFIED. spores stlll more highly magnified. 



We do not know that any direct attempts have been made to prevent 

 the disease here described. The parasite is one which buries itself in the 

 leaf-tissues, and, consequently, whatever treatment is given it must be 

 preventive. If the trees are sprayed with the sulphate of copper compounds 

 for the purpose of preventing plum rot on the monilia of fruit, it will be 

 well to observe what effect these applications have upon the development 

 of the leaf-spot fungus. 



M 



FRUIT STATISTICS OF THE DOMINION. 



R BUCKLE, says in his History of Civilization, * " Statistics as a 

 branch of knowledge, which, though still in its infancy, has already 

 thrown more light on the study of human nature than all the 

 sciences put together." Herewith is a diagram of the fruit statistics of the 

 Dominion for the past nine years, showing the exports and imports of 

 apples from 1881 to i88g inclusive. It will be seen that though our exports 

 fluctuate somewhat, they are steadily on the increase. It is believed when 

 suitable varieties are grow^n, the export trade is simply unlimited. The 

 causes of fluctuation proceeds principally from the failure of the crop, or 



*Page 24, Vol 2. 



