Fig. 59. Orchid Diseases. 



a. Volutella blight of Bletia (after Halsted), h. rust, Hemileia oncidi (after 

 Griffon and Maublanc), c. Sobralia anthracnose (after Halsted), d. bacterial leaf 

 spot, partly diseased leaf with cells invaded by the organism (after Hori, S.). 



