162 FUNGI AND FUNGICIDES 



and no other cause for the disorganization is to be seen. 

 Not unfrequently the leaves become spotted that Is, 

 certain areas decay and fall away. If a leaf freshly 

 affected is held toward the light, the diseased places 

 may be easily detected, by the peculiar discoloration, 



FIG. 71. MUSKMELON LEAF SHOWING BACTERIAL BLIGHT. 



being due to the excess of moisture a sogginess, so to 

 speak." (Halsted.) 



Effective preventive measures for this vexatious mal- 

 ady have yet to be found. Presumably rotation of crops 

 will prove an important method, but if the same germs 

 affect many widely separated plants, a specially devised 

 rotation may be required. 



