BEET RUST 



229 



petition of the disease. When the crop is lifted, the leaves, 

 covered with teleutospores, often find their way into the 

 piggery or cattle-fold, whence many of the teleutospores 

 eventually find their way back to the field along with 



Fig- 57- — Uroinyces betae. i, portion of a mangel leaf, 

 spotted with the teleutospore stage ; 2, portion of a leaf 

 showing a white patch crowded with aecidia, x6; 3, 

 section of portion of a leaf showing two clusters or sori of 

 uredospores, X70 ; 4, aecidiospores, X300 ; 5, uredospores, 

 X 300 ; 6, teleutospores, x 300. 



manure. If the leaves are left to rot in the field the case 

 is no better. 



The fungus also occurs on wild beet, and from thence 

 has been proved to pass on to cultivated crops. 



BROAD BEAN RUST 



{Uromyces fabat% De Bary.) 

 This parasite is very common on the leaves and stems 

 of broad beans, peas, also on several wild leguminous 

 plants, as vetches, etc. The aecidium stage is the first to 



