GIPSY MOTH TREE-BANDING MATERIAL. 9 
handle is provided with a ratchet at the end, which meshes with 
dogs on the guide of the plunger. The nozzle, which is also made 
of tin, is attached to the base of the cjdinder and measures 1 inch 
long over all, projecting T % inch beyond bottom of cylinder. It is 
f inch in depth at the bottom of the cylinder, tapering to J inch at 
the tip, the space between these measurements being open on one 
side and end. The width is J inch. A nozzle of these dimensions 
molds a band ^f by 3*% inch. 
The gun when filled holds from 1.6 to 2 pounds of the material. 
The material is easily transferred to the gun by means of a wooden 
Fig. 
3. — Tree-banding gun in position during application of band of gipsy moth tree- 
banding material. Note the square edges of this band. 
paddle, or better by an implement made of thin steel plate 2J inches 
wide and 10 inches long. The plate should be cut down so that a 
handle 4 inches long is provided at one end. 
The bands should be applied (fig. 3) to the trunks of trees 5 to 8 
feet above the ground when the infestation of caterpillars is on 
private estates where there is danger of animals, such as horses or 
cows, rubbing into them. In the border territory of the gipsy-moth 
area where extermination of colonies is intended it is sometimes more 
advantageous to place the bands low down on the trunks of trees. 
This is done to prevent the small larvee crawling up from the ground 
and clustering on the trunks of the trees in positions from which 
they may be more easily dislodged and dispersed by the wind. 
1662°— 20 2 
