164 



THE BOOK OF THE ROSE 



CHAP. 



burst? the membranes of the Rose plant and appears 

 outside. 



The life-history of this fungus, known as Colco-sjjoriura 

 plague and several other names according to its different 

 stages, is much the same as that of Rose-mildew. 

 Orange fungus has. too. the resting 1 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 harm- 

 fully 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 Roses of certain sorts may be some- 

 times seen standing leafless except for just a tuft of the 

 youngest foliage at the top. All the other leaves, 

 covered with the black spots, have withered and fallen, 

 as if it was winter. 



The Victor Verdier race are the most liable to suffer 

 in this way,, and in fact are generally badly off for leaves 

 by the end of August,, but a great many other H.P.s 

 are often victims, especially the very dark ones and all 

 that are budded on manetti. Teas are entirely exempt 

 from it. and it is rare under glass. 



Partly from the fact that the first and principal bloom 



