232 GARDEN FOES. 



is iiu known rcnicHly. It is advisable also not to grow 

 peais in the same position in consecutive years. 



Violet Diseases — Quite a ininihcr of diseases 

 attack the violet ami pansy. I'hus, tlie Violet Leaf Spot 

 (Phyllosticta vioke) causes whitish spots to form on the 

 leaves, which cripple the growth. The Violet Smut 

 (Urocystis violse) attacks the violet, causing the petioles 

 to become swollen and gouty, and the leaves to be blis- 

 tered and distorted. The Violet Bust (Puccinia viol*) 

 appears on the leaves in the form of rusty-brown or black- 

 ish pustules, and cripples the growth of the leaves and 

 stems. Then th^re is also the Violet White Mould (Piamii- 

 laria lactea), which attacks the leaves in the form of a 

 white mealy mould; and the Violet Black Mould (Cerco- 

 spora viokie), which forms dark spots on the foliage. 



Kemedies. — It is advisable in nearly every case to pull 

 up and burn infected plants, as once they are attacked 

 by the disease their growth is generally so crippled that 

 fungicides are of little avail. Probably spraying with \ 

 fungicide might prove a preventive, if not a cure. 



CHAPTEE III. 



ROSE PESTS. 



A INSECTS. 



Ants.— These, though they do not directly injure 

 plants generally, yet in an indirect way often prove inju- 

 rious. Ants, as is well known, take great care of Aphides, 

 and may often be seen carrying the young ones to pas- 

 tures new, so that they are leagued with the gardeners' 

 and with the rosarians' greatest enemy. A sticky, sweet 

 liquid, called honeydew, secreted by the Aphides, con- 



