88 



FUNGI AND FUNGICIDES 



green parts of the plant, usually doing most damage to 

 the young shoots and the fruit. On the former it ap- 

 pears at first in the shape of 

 small sound brown SJM.N. 

 depressed in the center, and 

 having a slightly elevated 

 dark colored border. As the 

 shoots grow the spots grad- 

 ually elongate, and their 

 middle portions become 

 more distinctly depressed be- 

 cause of the killing of the 

 tissue. The effect upon the 

 fruit is well illustrated in 

 Fig. 43 ; there first appears 

 a small grayish spot, having 

 its margins dark brown. 

 The spot gradually enlarges, 

 and there is frequently de- 

 veloped just inside the dark 

 brown margin a bright ver- 

 milion ring. On account of 

 this, the disease is often 

 called the "Bird's-eye" Rot. 

 As the fungus progresses the 

 growth of the berry is 

 checked, and it finally be- 

 comes a dry, withered mass 

 of skin, surrounding the par- 

 tially developed seeds. The 

 manner of development upon 

 the leaves is similar to that 

 FIG. 43. ELVIRA GRAPE AFFECTED upon the green shoots. Like 



BY ANTHRACA'OSK. ^g,. f ^ ftg an fcl irac . 



nose fungus reproduces by means of minute spores, some 

 of which are represented, highly magnified, at Fig. 44 c. 



