SHOT-BOKER. 



185 



observers) consist, for one thing, in collecting and destroying 

 the infested little Plums before the caterpillar within can 

 leave them to bury itself. This may be done by jarring or 

 shaking the trees, so as to cause the damaged fruit to fall on 

 to cloths spread beneath the trees^ and having this fruit 

 immediately gathered together and burnt before the grub 

 within escapes. Or the infested fruit may be picked from 

 the trees by choosing such of the little unripe Plums as 

 show a black spot, where the sap and black rejected matter 

 from the grub have run down its tunnel and show outside. 



The black sawflies are sluggish, and when egg-laying, or 

 sucking honey from the Plum blossoms, may be caught by 

 hand where they are in reach on low-growing trees. 



See also measures of prevention and remedy for Apple 

 Sawfly, pp. 37, 38. 



"Shot-borer"; "Apple-bark Beetle"; "Pear Blight." 



Xylehorus dispar, Fab. ; JJostrichus dispar, Fab. ; Xylebonis 2^yri, 

 Peck (of American writers). 



■/ I'M!', '1,1 I . .,f^^^ 



Xyleboeus dispak. — Male and female beetle, magnified; lines showing natural 

 length. Plum stems, showing horizontal and perpendicular galleries. 



The following observations refer to the serious, and often 

 rapidly fatal, injury caused to young Plum trees by the 



