THE FUNGUS PESTS 



OF 



CERTAIN FLOWERS 



FUNGUS OF SENECIO DISEASE 

 Uredo senecionis 



CINERARIA AND SENECIO DISEASE. Senecio pulcher has only 

 been in cultivation in England for a few years, yet during this 

 time it has in some 

 gardens been completely de- 

 stroyed by a fungus named 

 Pucdnia glomerata, or rather 

 the Uredo state of this fungus 

 with simple, not compound, 

 spores. The fungus is well 

 known, and very common on 

 the wild species of Ground- 

 sel in England, being especi- 

 ally frequent and virulent on the Ragwort Groundsel, Senecio Jacobea. 

 The leaves of infected plants are covered with rust-coloured dusty 

 pustules, the Uredo condition of the fungus, and known in this state 

 as Uredo senedonis, sometimes termed Trichobasis senedonis. 



At A is illustrated a fragment of a leaf of Senecio pulcher, natural 

 size, and covered with the orange fungus ; at B a small part of a Uredo 

 pustule as seen bursting through the cuticle of the Senecio leaf. 



The fungus has a Pucdnia stage of growth very similar to that of 

 the Hollyhock fungus. 



No remedial measures for the extirpation of this fungus are 

 known, but as garden Senecios and Cinerarias are infected by dis- 

 eased plants of Wild Groundsel, it is desirable that weeds of the 

 latter (especially when diseased) should be destroyed. Weeds in and 

 about gardens are a common cause of disease in cultivated plants. 

 It often happens that a weed, being sturdy, is only slightly incon- 



