OFFICE OF 
STATE ENTOMOLOGIST 
ST. ANTHONY PARK, MINN. 
Circular No. 29 
JAN. 20, 1914 
TWO RASPBERRY PESTS WHICH MAY BE 
CONTROLLED BY SPRING PRUNING 
Eggs of Oeean/TiMS. (a) twig, showing puncture ; (6) twig split open to show eggs ; 
(c) a single egg; (d) cap of egg enlarged . After Riley. 
The Snowy Tree-Cricket (Oecanthus niveus) and the Red- 
necked Cane Borer (Agrilus ruficollis) are two common pests of 
raspberries and the latter also of blackberries in Minnesota. The 
injury caused by these two insects is readily seen in the winter 
time or, better yet, in the early spring when the raspberries are 
putting out their leaves. 
The Snowy Tree-Cricket is a delicate, greenish-white cricket 
which, during the summer, lives among the foliage of various trees 
and shrubs. The male insect has wing covers with oblique thicken- 
ings or ribs which form part of the musical apparatus of the insect. 
The call of these Tree-Crickets is somewhat similar to that of the 
.Katydid but not quite so harsh. They are heard during the early 
evening and night, when theirs is proljably the most noticeable of 
all the insect music in Minnesota. The female insect does not have 
an arrangement for producing music and the wing covers are 
wrapped closely around the body, being therefore a much narrower 
insect than the male. Both the young and the adults feed almost 
entirely upon various green flies and other small insects and 
althoug'h they may occasionally nibble a bit of the foliage of the 
plant, they must 1)e regarded, in these stages, as beneficial insects. 
When the female is about to lay her eggs, she punctures with her 
ovipositor the cane of raspberries and various woody weeds, even 
in some cases the tender twigs of fruit trees. In each puncture, she 
places an elongate egg in the pith of the plant. The punctures are 
