124 
PLUM. 
f 
in our power of checking spread of this attack. This infestation 
appears to merit attention, for it is being increasingly reported. In 
1850 (as quoted p. 122) it was considered as of rare occurrence, and 
it has gradually been more observable, until, as at present or in the 
last few years, I have notes and specimens of infestation, of both S. gig as 
and S.juvencus (the Steel Blue Sirex), occurring in standing timber 
to an extent to cause definitely calculable loss. 
PLUM. 
“ Shot Borer.” “ Apple-bark Beetle.” “ Pear Blight.” Xyle- 
borus dispar , Fab.; Bostrichus dispar, Fab.; Xyleborus pyri , Peck 
(of American writers). 
Xyleborus dispar: Male and female beetle, magnified; lines showing nat. length. 
Plum stems, showing horizontal and perpendicular galleries. 
It will be remembered that in 1889 a small dark brown beetle 
(figured magnified above with the natural length marked accompanying), 
which had previously been considered to be one of our rarest kinds, 
made its appearance in stems of Plums at the Toddington Fruit 
Grounds, and a few other localities not far off, in such numbers as to 
cause considerable injury. 
The mischief is caused by the beetles so tunnelling the trees as to 
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