226 GARDEN FOES. 



CHAPTEE II. 



DISEASES OF HARDY PLANTS. 



Bulb Diseases — Bulbs are subject to the attack of 

 several fungoid diseases. Thus, hyacinths are occasionally 

 infected with Sclerotinia, a fungus forming patches of 

 olive-brown mould, preceded by yellowish patches on the 

 leaves. The mould eventually descends to the bulb and 

 causes it to decay. Another disease of bacterial origin, 

 called Bacteriosis, causes yellow patches to form on leaves 

 and bulbs, and checks the growth of the bulb. A black 

 mould, called Smut, forms on the foliage of colchicums 

 and muscaris, and finally destroys the bulbs. Tulips are 

 attacked similarly to hj-acinths, and a form of mildew 

 attacks the leaves of the snowdrop. 



Kemedy. — The only one is to destroy all infected bulbs 

 by burning. 



Carnation Diseases— The carnation is subject to 

 the attack of at least three fungoid pests. First of all, 

 there is the Pink Rust (Puccinia arenariixi), which forms 

 small black spots in circles on the leaves and stems ; the 

 Fairy King Fungus (Heterosporium echinulatum), which 

 also forms black clusters in irregular circles on the sur- 

 face of the leaves, like the miniature fairy rings of the 

 pasture; and Macrosporium nobile, which manifests itself 

 in the form of small dark-coloured spots on all sides of the 

 leaves .and stems. All three are destructive to the plants, 

 killing them in due couree. 



Eemedies. — Badly-diseased plants should be burnt. 

 Those only slightly attacked should be sprayed with a 

 Sulphide of Potassium Solution (Formula No. 23). If the 



