= aere ry, See ae eee 
ee ee 
——- = 
Protection of Mesquite from Borers. 
Fie. 3.—Section of mesquite wood five 
inches in diameter, showing the sap- 
wood destroyed and the honey-combed 
heartwood six months after attack by 
the roundheaded borer, 
Iie. 4.—Section of mes- 
quite stick after four 
months work by smaller 
powder-post grubs, 
showing depth to which 
sapwood is eaten. The 
small holes in the bark 
are made by the adults 
which have emerged, 
