INSECTS INJURIOUS TO THE APPLE AND PEAR 551 



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 



Fio. 486. Apple leaf injured by the bud moth caterpillar natural size. 

 (After W. E. Britton.) 



effectively destroyed by spraying with arsenate of lead 1 pound 

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

 and again before the trees blossom. 



