150 Select Carnations, Picotees, and Pinks. 
Bacteriosis. 
For many years past a disease has existed in this 
country, the nature of which was little, if at all, 
understood. The leaves, especially those of Mal- 
maison Carnations, become more or less covered 
with pale yellow, or colourless specks, which increase 
in number till the whole surface becomes involved, 
turns yellow, and dies. This happens usually during 
the dull days of autumn and winter. The presence 
of the malady may first be detected by holding up a 
leaf against the light, when minute subtransparent 
specks are apparent to the naked eye. 
Bacteriosis has been determinued to be due to a 
minute, one-celled fungus, Bacterium Dianthi, Arth. 
and Boll. There is no remedy beyond picking off 
the affected leaves and burning them.  Aphides, 
thrips, and red spider are blamed for puncturing the 
leaves, and thus making an entrance for the enemy. 
The careful cultivator will therefore keep these 
enemies in check, and endeavour to maintain his 
plants in clean and healthy condition. Prevention 
rather than remedy is the golden rule in this, as in 
many other cases of plant diseases. Plenty of light 
and air, the avoiding of over-feeding, especially in 
winter, the presence of a moderate amount of atmos- 
pheric moisture, are essential to the welfare of 
Carnations in winter. This applies more parti- 
cularky to Malmaisons, tree and American Carnations 
in greenhouses. A. might temperature of 50 deg. 
will be sufficient for most varieties of tree and 
American Carnations, even when in bloom, but if 
some of the varieites require a higher temperature 
to prevent the splitting of the calyx, 55 deg. will 
generally be sufficient. A considerably higher tem- 
perature may be allowed during the day, especially 
with sunshine, if plenty of ventilation is given . - 
