36 The Horticulturist's Rule- Book. 



Raspberry, continued. 

 Root Gall-Fly (Rhodites i-adicum, Sacken). — A small larva 

 which produces galls, sometimes attaining two inches in 

 diameter, on the roots of the raspberry, blackberry and rose, 

 causing the bush to appear sickly, and eventually killing it. 



Remedy. — There is no remedy except to destroy the galls; 

 if plants are badly affected they must be dug up, and burned. 

 Sxowy or Tree-Cricket (CEcanthus niveus, Serv.).— Small and 

 whitish cricket-like insect, puncturing canes for two or three 

 inches, and depositing eggs in the punctures. 



Remedy. — Burn infested canes in winter or very early 

 spring. 



Red-Spider (Tetranychus telarius, Linn.). — A small red mite infest- 

 ing many plants, both in the greenhouse and out-of-doors. 

 It flourishes in dry atmospheres, and on the under side of 

 the leaves. 



Remedies. — Persistent syringing with water will destroy 

 them, if the spray is applied to the under surface. Fumes 

 of sulphur. Sulphide-of-soda wash. 

 Rhubarb. Rhubarb-Curculio (Lixus concavus, Say). — A grub 

 three-fourths inch long boring into the crown and roots. It 

 also attacks wild docks. 



Remedy. — Burn all infested plants, and keep down the 

 docks. 



Root-Knot (Heterodera radicicola) . — A disease characterized by the 

 knotting and contortion of the roots of the peach, orange and 

 many other plants. It is usually most destructive on the 

 peach. It is caused by a nematode, or true worm. Gulf 

 States. Attacks green-house plants. 



Preventives. — Plant non-infested plants in fresh soil; bud 

 into healthy stocks. Fertilize highly, particularly with 

 potassic fertilizers. Set the trees eight or ten inches deep 

 in high and dry soils. Infested small trees may be reme- 

 died, in part at least, by transplanting them into highly 

 manured holes which have been prepared contiguous to them. 



Rose. Root Gall-Flt. — See under Raspberry. 

 Mealy Bug. — On roses, a gill of kerosene-oil to a gallon of 

 water is a good remedy. Syringe the plants in the morning, 

 and two hours later syringe again with clean water. See 

 also under Mealy Bug. 



