336 



GREENHOUSE MANAGEMENT. 



CARNATION LEAP MOLD {CladospOTlum Sp.). 



This disease shows itself in minute circular spots, per- 

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

 They may become sufficiently 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. 121). 

 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 

 SNA _ the plants are only syringed early in the 

 tion leap mold, a^ there should be no serious trouble 

 from the disease, while if it does make its appearance 

 the usual fungicides will hold it in check. 



BOTRYTIS OR ROT OF CARNATIONS. 



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. 122, A), which devel- 

 ops an immense number of 

 spores (Fig. 122, 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. 



BOTRYTIS OF CARNA" 



tions (B magnified). 



