536 



GREBNHOtrsE MAlTAGEMENT. 



CABNA- 



CAEKATiON' LEAF MOLD (Cladosporium sp.). 



This disease shows itself in minute circular spots, per* 



haps one-tenth of an inch in diameter, upon the leaves. 



They may become suflBciently numerous to destroy the 



leaves attacked. At first they are of a gray color and 



bear a dense growth of mold, consisting 



of fruiting threads, upon the extremities 



of which the spores are borne (Fig. 131). 



These fall off and the spots become 



darker in color. The disease is thought 



to be Cladosporium herbarum var. nodo^ 



sum, by Prof. Atkinson. 



It is particularly troublesome upon 

 plants in poorly drained soil and where 

 care is not taken in watering and syring- 

 ing. Under proper conditions and when 

 the plants are only syringed early in the 

 TioN MAP MOLD, flay, there should be no serious trouble 

 from the disease, while if it does make its appearance 

 the usual fungicides will hold it in check. 



BOTKTTIS OR EOT OF CAKNATIONS. 



When the houses are kept quite warm and the soil 

 and air are damp, the open- 

 ing buds and the petals of 

 the expanded flowers soften 

 and turn yellow, and soon 

 become covered with a slimy 

 mold. This is the work of 

 a fungus known as Botrytis 

 (Fig. 123, A), which devel- 

 ops an immense number of 

 spores (Fig. 123, B). The ^ 

 temperature and moisture ^^ 

 should be regulated, all dis- 

 eased portions should be destroyed, and the plants 

 sprayed with cupram, or a solution of copper sulphate. 



122. 



EOTE1TIS OP CABKA* 

 TiONs (B magnltled). 



