LEAF SPOT FUNGI 



579 



at the first sign of the trouble, either by hand or with suitable 

 machinery which is fully discussed in Bulletin 186 of the California 

 Experiment Station. 



Leaf-Spotting, Puncturing or Deforming Fungi. These classes 

 are usually distinguishable by the results they produce. The mil- 

 dew of the peach produces dense, whitish patches on the leaves and 

 growing fruit; the curl-leaf fungus of the peach produces swellings 

 and contortions of the leaf; the scab of the apple and pear produces 





Effect of brown rot on fruit and twigs of apricots. 



first a smoky appearance on the leaf and afterwards causes black 

 scabby patches on the fruit and on the young twigs ; the slot-hole 

 fungus of the apricot, plum, cherry, and almond cuts roundish holes 

 in the leaves as though a shotgun had been discharged through the 

 foliage, and then, in the case of the apricot, produces roundish, dark 

 red pustules on the fruit; the brown rot which attacks both twigs 

 and fruit of apricots, prune, blackberry, etc., produced eruptions on 

 plums and peaches ; the rust fungi of the under sides of the leaves, 

 first of a yellowish or orange color, changing to dark brown or black, 



