INSECTS INJURIOUS TO THE APPLE AND PEAR 623 



sides of the leaves, protecting themselves by a thin silken 

 web. In the fall they migrate to the twigs and form the small 

 silken cases in which they pass the winter. 



Control. Dr. Britton reports that the caterpillars may be 



FIG. 479. Apple leaf injured by the bud moth caterpillar natural size. 

 (After W. E. Britton.) 



effectively destroyed by spraying with arsenate of lead 1 pound 

 to 10 gallons, which should be applied just as the buds are bursting 

 and again before the trees blossom. 



