34 The Horticulturist* s Rule- Book. 



Privet or Prim. PRIVET WEB -WORM (Margarodes quadri- 

 stigmalis, Gn.). Small larva feeding in webs on the young 

 shoots of the privet, appearing early in the season ; two 

 to four broods. 



Remedies. Trim the hedge as soon as the worms appear 

 and burn the trimmings. Attract the moths at night by 

 lights. Probably the arsenites will prove useful. 

 Quince. ROUND-HEADED BORERS. See under Apples. 



SLUG. See under Cherry. 



Radish. MAGGOT (Anthomyia raphani^ Harris). Indis- 

 tinguishable from the cabbage maggot, which see. Sow- 

 ing copperas upon the soil before planting is sometimes 

 adopted as a preventive of attack. 



Raspberry. CANE-BORER (Oberea bimaculata, Oliv.). 

 Beetle, black, small and slim ; making two girdles about 

 an inch apart near the tip of the cane, in June, and laying 

 an egg just above the lower girdle ; the larva, attaining 

 the length of nearly an inch, bores down the cane. Also 

 in the blackberry. 



Remedy. As soon as the tip of the cane wilts, cut it off 

 at the lower girdle and burn it. 



RASPBERRY ROOT-BORER (Bembecia marginata, Harris). 

 Larva about one inch long, boring in the roots, and the 

 lower parts of the cane, remaining in the root over winter. 



Remedy. Dig out the borers. 



RASPBERRY SAW-FLY (Selandria rubi, Harris). Larva about 

 three-fourths inch long, green, feeding upon the leaves. 



Remedy. Hellebore. 



ROOT GALL-FLY (Rhodites radicum, 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. 



