FAIRY-RING OF CARNATIONS 321 



Preventive Means. — Spraying with potassium sulphide 

 checks the disease. All diseased leaves should be picked 

 off and burned. By consistently attending to this point, 

 the disease does not spread, and the danger of a re- 

 appearance of the disease the following season is much 

 diminished. 



When plants are grown under glass, the foliage 

 should be kept as free from moisture as possible, as, if 

 the surface is dry, floating spores alighting on the leaves 

 do not germinate. Secure good ventilation, and avoid 

 watering the foliage. 



Smith, Gard. Chron.^ 1886, p. 244, fig. 



Heterosporium gracile, Sacc. — Often disfigures or kills 

 the leaves of cultivated species of Iris, Freesia, Antholyza, 

 and Heinerocallis. 



The mycelium is localised, but as the diseased spots — 

 elliptical, pale brown, with a darker margin — are often 

 abundant, and also large, up to half an inch long, attacked 

 leaves soon die. The pale spots eventually become 

 studded with the minute olive-brown tufts of conidio- 

 phores, bearing the large, warted conidia at their tip. 



Damage has been done to members of one or other of 

 the above-named genera in Europe, Cape of Good Hope, 

 New Zealand, and United States. 



Preventive Means. — Spraying with ammoniacal copper 

 carbonate solution checks the disease — at least, when 

 present on Freesia recurva. I have not experimented in 

 the case of other genera. Clear away diseased leaves, 

 and do not disperse the conidia in so doing. 



X 



