468 ECONOMIC ZOOLOGY AND ENTOMOLOGY 



currant-borers. The aflected plants should be dug up and 

 burned. 



The Raspberry Cane-borer (Oberca bimaculata) , the adult of 

 which is a slender cylindrical beetle about one-half an inch 

 long with antennae about as long as the body, and the red- 

 necked cane-borer, Agrilus ruficollis, the larvae of a flat blackish 

 or bronze-colored beetle with a red prothorax, both attack 

 the canes of raspberries and blackberries. The larvae of a 

 fly that looks very much like a small house-fly also often 

 destroy many of the new shoots. 



In all these cases affected canes should 

 be cut out and destroyed as soon as no- 

 ticed. 



Scale -insects. Among the scale-insects 

 which often attack the raspberry and 

 blackberry vines, the rose-scale, Aulacaspis 

 roses, is perhaps the most common. Atten- 

 tion is usually attracted to the presence of 

 this insect by the white elongate scales of 

 the males which often occur in such num- 

 bers as to make the canes look as if they 

 had been whitewashed. The scale of the 

 female is circular and somewhat darker. 



The badly infested canes should be cut 

 out and the others sprayed with the sul- 

 phur-lime wash during the winter. 



FlG _ 222 R ose Such leaf -feeding insects as the raspberry 



scale, Aulacaspis saw-fly , Monophadnoides rubi, and the rasp- 



roscB on blackberry berr Byturus, Byturus unicolor, may be 

 bush. (About nat- / / ' . . . 



ural size.) controlled by spraying with arsenate of 



lead, if the application is made before the 

 berries form. If the slug-like larvae of saw-flies appear later, 

 white hellebore may be sprayed or dusted on the plants. A 

 little greenish or brownish mite, Bryobia pratensis, referred 

 to on page 212, often occurs in destructive numbers on the 

 raspberry leaves causing them to turn yellow and fall. 

 Thorough sprayings or dustings with sulphur will usually 

 control them. 



