Bui. 992, U. S. Dept. of Agriculture 
PLATE IV. 
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€ 
The Walnut Husk-Maggot. 
a, Black walnut showing discolored spot on skin made by husk-maggots mining within; b, black 
walnut stained by juice flowing from oviposition scar; c, husk-maggots in Persian walnut: 
d, black walnuts with husk removed to show difference in hulling between sound and infested 
nuts; nut on the left sound, on the right infested. All about natural size. 
