1 62 DISEASES AND INSECT ENEMIES. 



even the microscope fails to reveal the presence of 

 the fungus externally. If these leaves are placed 

 in moist air for twenty-four hours, however, an 

 abundant crop of reproductive bodies will be 

 found on the diseased areas. 



48. Spot disease. Early effects on foliage. 



The effects of spot are so well known as to 

 require but little description to recognize them. 

 The first effects, however, are usually overlooked 

 and it is really after the plant has in a measure 



