Bui. 39, Biological Survey, U. S. Dept. of Agriculture 

 1 



Plate IX. 



Work of Sapsucker on Hickory, Maple, Basswood, and Chestnut; Bird's-eye., 



[1, The beginnings of a girdle on mocker nut. 2, Well-developed girdles, tree 2 feet in diameter. 

 3, Mocker nut, killed by sapsuckers. 4, Sapsucker pecks and stains in sugar maple wood. 

 5. Natural bird's-eye in sugar maple. 6, Sapsucker bird's-eye in same wood. 7, Stains due to 

 sapsucker pecking in basswood. 8, Stained knotty checks in chestnut.] 



