LEAF CURL 83 



young leaves or twigs, but it is not definitely known in 

 what manner this takes place. When once attacked, a 



"* ... 



/ 



ft 







Fig. ii. Exoascus deformans. i, two peach leaves curled 

 by the fungus ; 2, portion of the fungus on the surface of 

 a leaf; a, asci containing spores, x 300; 3, spores from 

 the asci producing secondary spores by budding. There are 

 at first eight spores in each ascus, but by a process of bud- 

 ding each spore produces numerous very minute secondary 

 spores, so that eventually the ascus is quite filled with 

 secondary spores ; x 300. 



tree rarely entirely recovers, but as a rule becomes more 

 diseased as time goes on, owing to the spread of the 



