20 



The Horticulturist } s Rule- Book. 



Apple, continued. 

 Flat-headed Borer {Chrysdhothris femorata, Fabr.).— Larva 

 about an inch long, flesh-colored, the third segment (■■ head ") 

 greatly enlarged ; boring under the bark and sometimes into 

 the wood. 



Preventive. — Soap and carbolic-acid washes applied early in 

 June and July. Keep trees vigorous. 

 Remedies. — Dig out the borers. Encourage woodpeckers. 

 Pear Twig-Beetle. — See under Pear. 



Pluh-Curculio (Conotracfielus nenuphar. Herbst). — Beetle: 

 punctures the fruit and causes it to become distorted. 



Remedies. — Arsenites. Plant plum trees at intervals 

 throughout the orchard to attract the curculio, and fight 

 the insects on the plums. See under Plum . 



Root-Louse (Schizoneura lanigera. Hausm.). — A minute insect 

 which causes swelling upon the roots of the tree, impairing 

 its vitality, or killing it. In another form the insect attacks 

 the young branches. It is then conspicuous from its cottony 

 covering. The treatment for aphis is useful here. 



Remedy. — Hot water. Scalding hot water may be poured 

 on the bare roots of trees standing in the soil, or nursery 

 stock may be dipped in water having a temperature of 120° 

 to 150°. Kerosene emulsion or tobacco dug in about the tree. 

 Infested nursery trees should be dipped in kerosene emul- 

 sion. Mulching about trees is said to bring the lice nearer 

 the surface. 



Rose-Beetle.— See under Rose. There is practically no 

 remedy for the rose-beetle on large orchard trees. Ravages 

 can be prevented, to a large extent, by the lime spray and 

 the emulsions. 



Round-headed Borers (Saperda Candida and S. cretata, Fabr.). 

 — Larva, an inch long when mature ; bores into the tree. It 

 remains in the larval state three years. 



Preventive. — Soap and carbolic-acid washes applied early in 

 June and July. 



Remedies. — Dig out borers in the fall. Insert a wire into 

 the holes. 



Tent-Caterpillars (Clisioeampa Americana and C. sylvatica. 

 Harris). — Larva, nearly two inches long, spotted and striped 

 with yellow, white and black; feeding upon the leaves. 



