FIG. 52. ASPARAGUS DISEASES. 



a. Asparagus rust on stems, showing sori with winter spores, b. cluster cup stage 

 of Puccinia asparagi, c. Uredo or summer spores of P. asparagi, d. Teleuto or winter 

 spores of P. asparagi (b. to d. after R. E. Smith). 



