184 THE BOOK OF THE ROSE chap. 



extremely well. Betber no air at all than a cold 

 draught when the sun is hot, I am sure. Sulphur 

 upon the hot-water pipes is the well-known remedy, 

 and for pot Eoses I should use finger and thumb 

 with sulphur or sulphur solution. 



Orange Fungus or Bed Bust. — This fungus-pest is 

 not so well known or so harmful as mildew ; but it 

 is more difficult to combat, either by preventive or 

 remedial measures, for its growth is inside the leaves 

 and stems of the Eose, and it is only when the spores 

 are ready for dissemination, and scatter with a touch, 

 that it bursts the membranes of the Eose plant and 

 appears outside. 



The life-history of this fungus, known as Goleo- 

 sporium pingue and several other names according 

 to its different stages, is much the same as that of 

 Eose-mildew. Orange fungus has, too, the resting 

 stage of winter in small but visible black spots on 

 the fallen leaves, the woven mass of mycelium of 

 spring in the leaves or leaf-stalks attacked, and the 

 summer spores which proceed from it. 



It can be recognised at once by its colour, which 

 in the spring is a purple spot with a concave yellow 

 centre on the upper part of the leaf and a convex 

 bright orange spot underneath, sometimes red at 

 midsummer, changing to simple black spots on the 

 leaves, which fall quite early in August. In my 

 own garden I see very little of the yellow or orange 

 stages, but plenty of the last one. 



A considerable point in favour of this pest is that 

 it very rarely makes its presence disagreeably and 

 harmfully felt till the first bloom, the "season " of 

 exhibitors is over. August is the month of its 

 power, and at that time whole rows of Eoses of 



