FUNGOID PESTS OF CULTIVATED PLANTS. 249 



Pea Mildew. 



Erysiphe Martii (Lev.), PI. VII. fig. 111. 



The mildew which infests the Garden Pea attacks also the Field Pea, 

 and hence the description to be found under " Garden Vegetables " (p. 88) 

 will also be applicable here. 



Field Pea Rust. 

 Uromyccs Pisi (Pers.), PL VII. fig. 110. 



The rust of the Field Pea is the same as that which attacks the 

 Garden Pea, and will be found noticed in the section devoted to " Garden 

 Vegetables " (p. 88). 



Field Bean Rust. 



Uromyces Fabas (Pers.), PL VII. fig. 106. 



The rust of the Field Bean is equally common to the garden varieties, 

 and will be found described amongst " Garden Vegetables " (p. 86), hence 

 it needs not to be repeated here. It has a wide distribution throughout 

 Europe. 



Lima Bean Mildew. 

 Pliytophthora Phaseoli (Thaxter). 



This rot mould, which is closely allied to the Potato mildew, has 

 proved very destructive to the Lima Bean in the United States, and 

 should be guarded against as possible to attack French Beans and runners 

 in Europe. It attacks chiefly the legumes. 



Thax. Bot. Gaz. xiv. p. 273, 1889 ; Mass. PL Dis. p. 65. 



Lucerne Tumour. 

 Urophlyctis Alfalfce (v. Lagerh.). 



This disease appears to have originated in Ecuador. In 1902 it 

 appeared in Alsace, where it soon spread into several districts, and thence 

 it travelled into Italy. Early in 1906 it was found near Heme Bay in 

 Kent, and has become a British pest. Evidently allied to the tumour on 

 Potato, it attacks the crown of the root, forming gall-like excrescence 

 three-quarters of an inch across, consisting of cells containing a crowded 

 mass of brownish spores (40 /; diam.). No remedy has yet been tried, 

 but infested spots have been ploughed up. 



Gard. Chron. Feb. 24, 1906, p. 122. 



Vetch Rot Mould. 

 Peronospora Vicica (Berk.), PI. XXIV. fig. 18. 



This pest occurs on the under surface of the leaves of the Field Bean, 

 Field Pea, Vetch, and Melilot ; often forming a dense felt of a whitish, 

 then greyish colour. The erect fertile threads are produced in tufts, and 



