Injurious Insects. 19 



Apple, continued. 



PEAR-TWIG BEETLE. See under Pear, 



PLUM CURCULIO (Conotrachehis nenuphar, Herbst). Beetle; 

 punctures the fruit and causes it to become distorted. 



Remedies. Arsenite . Plant plum trees at intervals 

 throughout the orchard to attract the curculio, and fight 

 the insects on the plums. See under Plum. 



ROOT-LOUSE (Sc/iizoneitra lanigera, Hausm). A minute insect 

 which causes swelling upon the roots of the tree, impair- 

 ing 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. 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. Rav- 

 ages can be prevented, to a large extent, by the iime spray. 



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 in July. 



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

 into the holes. 



TENT CATERPILLARS (Clisiocampa Americana and C. sylvatica, 

 Harris). Larva, nearly twoinches long, spotted and striped 

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



Remedy. Arsenides, as for codlin moth. Burn out nests 

 with torch. 



TUSSOCK MOTH (Orgyia leucostigma, Sm. and Abb.). A hand- 

 some caterpillar, an inch long, bright yellow with red 

 markings, very hairy. Eats the leaves. 

 Remedy. Arsenites. 



