1906.1 Onion Mildew. 231 



growth, as is usually the case, the crop is completely destroyed, 

 unless preventive measures are applied. 



Preventive Measures. — The disease in its epidemic form is 



Onion Attacked by Mildew. 



entirely due to the particular kind of fruit described above 

 which appears under the form of very fine powder on the leaves. 

 This is quickly dispersed broadcast by wind or insects. As a 



