PHRAGMIDIUM 313 



dark brown, 3-8 septate, 75-100X26-30 /*, pedicel long, 

 thickened in the middle. 



The infection in spring depends entirely on the presence 

 of teleutospores present on fallen leaves, consequently all 

 fallen leaves should be either buried by digging during the 

 winter or by sweeping up and burning. Plants that have 



FIG. 92. Phragmidium subcorticatum. i, rose branch 

 and leaves with aecidium stage of fungus j 2, rose leaf with 

 teleutospores ; 3, teleutospores ; 4, uredospores. Figs, i 

 and 2 nat. size, remainder highly mag. 



been attacked should be drenched with a solution of sulphate 

 of copper during the winter. 



Raspberry rust (Phragmidium rubi-idaei, Winter) pro- 

 duces its three stages on the raspberry plant. The aecidium 

 condition appears first on the upper surface of the leaves in 

 the month of June, under the form of greenish-yellow pustules, 

 usually arranged in broken circles. The uredo stage appears 

 next, and differs but little in appearance from the aecidium ; 



