THE YOUNG CATERPILJUARS ARE CARRIED BY THE WIND SIX MIEES OR MORE 



The screen shown in this picture is covered with tanglefoot to catch caterpillars in the 

 air. As the young caterpillar of the gipsy-moth hatches from the egg it spins down on 

 warm days suspended by a silken thread, is caught up by the wind and carried sometimes 

 for miles before it succeeds in attaching itself to a tree or shrub. Large-scale experiments 

 in the last two or three years, conducted by erecting enormous wire screens at various dis- 

 tances to the windward from infested woods, the screens being coated with a sticky substance, 

 have shown that many young caterpillars are carried in this way to a distance of six miles 

 or more. 



Photos from U. S. Department of Agriculture 

 SAWED LUMBER, BEARING EGG-MASSES OE THE GIPSY-MOTH, SERVES AS AN EASY 

 MEANS FOR THE SPREAD OF THE MOTHS 



41 



