16 



FARMERS BULLETIN 845. 



fig. 8.) Placing these bands on the trees prevents the caterpillars 

 from reaching the fohage; and as the caterpillars usually mass in 

 large numbers beneath the bands, conditions are favorable for the 

 development of wilt disease, and the caterpillars often die in large 

 numbers from this cause and from starvation. 



Use QJ tree-handing material. — A new material for banding trees 

 has been prepared and tested by the Bureau of Entomology in coop- 

 eration with the Bureau of Chemistry. It is black and of a 

 greasy nature and is applied to the trees with a special "gun" 



