40 HORTICULTURIST'S RULE-BOOK. 



Radish. MAGGOT (Anthomyia Eaphani of Harris, but now 

 considered to be identical with the cabbage root-maggot). 

 Treated the same as the cabbage- maggot, which see. 

 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. 



Remedies. Hellebore. Arsenites, after fruiting. 

 ROOT GALL-FLY (Rhodites radicum, Sacken). A small 

 larva which produces galls on the roots of the raspberry, 

 blackberry, and rose, causing the bush to appear sickly, 

 and eventually killing it. The swellings are probably 

 often confounded with the true root-galls, which see 

 under R. 



Remedy. There is no remedy except to destroy the 

 galls ; if plants are badly affected they must be dug up 

 and burned. 



SNOWY 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 infesting many plants, both in the greenhouse and 

 out of doors. It flourishes in dry atmospheres, and on the 

 under sides of the leaves. 



