PESTS OF THE FLOWER GARDEN. 



41 



but also on cultivated Lupins, as Lupinus luteus and Lupinus albus 

 in Great Britain, Germany, and Italy, and appears on the foliage. 



The pustules of the uredo are rounded, rather small, and of a reddish 

 or chestnut brown. The uredospores, which are soon set free by the 

 rupture of the cuticle, are globose and rough (22-24 /x diam.), of a pale 

 chestnut-brown colour. 



The teleutospores, or brand spores, are produced in dark-brown 

 pustules, and are shortly elliptical, almost globose (19-22 x 17-20 //), 

 dark brown, clad with obtuse stoutish warts, growing at first on a slender 

 hyaline pedicel, which soon falls away. 



If applied early, fungicides will prevent the spread of this disease, 

 but the teleutospores are capable of acting as resting spores, carrying the 

 disease through the winter. 



Sacc. Syll. vii. 1966 ; Grevillc Eng. Flor. v. p. 383 ; Ploior. Br. Ur. 

 135. 



Another species (Uromyces Lupini) is found on the same Lupins in 

 Italy, Germany, and Egypt, with smooth uredospores and smaller teleuto- 

 spores. The North American species is again different. 



DISEASES OF ROSES. 



Fortunately the diseases to which cultivated Roses are subject in this 

 country are few, and one of the most dangerous, the rot-mould, is rare. 

 The common rose mildew is most troublesome and unsightly, and one or 

 two of the others are very persistent, but they do not threaten Rose 

 culture as that of some other flowers has been threatened. 



Rose Leaf-spot. 



Septoria rosarum (West), PI. III., fig. 49. 



So far as our knowledge and experience go, the leaves of cultivated 

 Roses are liable to spotting by three different fungi, belonging to the 

 genus Septoria, with threadlike spores. The one recorded as British is 

 named above. 



White rounded spots, to the number of ten or fifteen, occur on the 

 upper surface of the leaf, surrounded by a rather broad purple border. 

 Now and then the minute receptacles of the fungus are dotted over the 

 spots, but these are often wanting, as they are upon similar spots on 

 Strawberry leaves. 



The perithecia, when present, contain long threadlike sporules (50- 

 60 n), which are furnished with a row of from three to six nuclei, 

 ultimately divided by transverse septa into about six cells. 



This spot fungus is recorded for Britain, Belgium, and Italy. 



Spray with copper solution. 



Sacc. Syll iii. 2617 ; Cooke Hdbk. No. 1328. 



Another species, under the name of Septoria Bosce sinensis, is recorded 

 for Italy and Portugal, but the pale spots have a brownish margin. The 

 sporules seem to be the same, and possibly it is identical with the above. 



