FUNGI AFFECTING THE PEACH 



The Peach Leaf=curl 



Tapli r in a deform a ns 



It often happens that in sjmng. soon after the 

 leaves begin to expand, the fohiage of peach trees be- 

 comes curled and misshapen. The 

 leaves are iisnally thickened and 

 discolored, aud fall off in a short 

 time. All the branches may be 

 attacked, or the injury may be 

 confined to only a part of the tree. 

 When the disease is severe the 

 yonng fruits fall off, and the crop 

 for the year is destroyed. The 

 defoliated trees soon push out a 

 uew set of leaves, but too late to 

 repair the damage done to the 

 fruit crop. 



This leaf-curl is most injuri- 

 ous during vet springs. It often 

 ruins the peach crop over large 

 areas. It is uncertain in its 

 attacks, and comparatively little 

 is known of the life-history of the 

 fungus which causes it. 



If a thin section of one of the 

 swollen leaves be placed under a 

 high power of the microscope, the 

 FIG. 36. PEACH LEAF-crRL. threads of the mycehum of the 

 fungus can be seen between the leaf cells, and sometimes 

 extending through them. The mycelium is most abund- 



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