PLATE 8 1 

 Onion smudge: 



A, B, E, D. — Advanced stages of smudge after several months in storage. Note the 

 shrinkage of fleshy scales and the tendency to sprout. 



C. — Bulb inoculated in a moist chamber with a suspension of Colletotrichum cir- 

 cinans conidia. 



F, G. — Macrosporium sp. on outer scale of white onion sets. 



H. — M. porri and Phoma alliicola on outer scale of white onion set. Natural 

 size. 



