BULLETIN No. 143. 



I. THE COTTONWOOD LEAF-BEETLE. 

 II. GREEN ARSENITE. 



SUMMARY. 



During the past four years the growers of basket- 

 willows in central New York have suflEered serious 

 loss from the depredations of the Cottonwood leaf- 

 beetle. 



In both the larval and the mature stages, the in- 

 sect attacks the willows, feeding upon the young leaves 

 and tender bark near the tips. This injury to the tips 

 causes the willow " whips " to branch, thus rendering 

 them worthless for basket-making purposes. 



It lives above ground during all of its transforma- 

 tions. The eggs are laid upon the leaves and 

 the larvae feed upon the more tender tissues. The 

 pupse are attached to the under sides of the leaves or 

 to the bark. The mature insects, beetles, are active 

 and fly readily from one field to another. The winter is 

 passed in the adult stage, the beetles seeking shelter 

 under stones, logs or any convenient rubbish. 



On the experimental field the willows were success- 

 fully protected by three applications of green arsenite, 

 I pound to 100 gallons of water. 



