Insects and Insecticides. 
35 
The peach twig-borer can also be taken under these bands. 
Bands of paper or wire screen are sometimes wrapped about 
the entire trunk to prevent the entrance of borers, as shown in 
Plate IV., Figs. 2 and 3. 
37. HOPPER-DOZERS OR HOPPER-PANS. 
For the purpose of catching jumping insects, especially grass¬ 
hoppers, the hopper-dozer or hopper-pan is most useful. There are 
different methods of constructing these pans. A form used by 
' Dr. Riley and illustrated by him many years ago is shown at 
Fig. 2. The pan in the illustration is entirely of sheet-iron, and is 
drawn across the fields by two men or two horses. In the bottom 
of the pan is placed a small amount of water with kerosene on top 
of it. All grasshoppers that come in contact with the oil die. The 
back of the pan may be extended by means of stakes at the corners 
and a strip of cloth hung between them. Such an extension 
catches many grasshoppers that would otherwise escape. 
38. STICKY SUBSTANCES. 
Bandages of sticky substances, such as printer’s ink, “ Dendro- 
line,” or “ Raupenleim,” or even cotton batting, are sometimes used 
to prevent insects from climbing trees. Where oily substances are 
used it is safer to put them on a bandage of stout paper, which is 
then wrapped about the trunk of the tree. 
THE APPLICATION OF INSECTICIDES. 
IN THE DRY WAY. 
The upper surface of the leaves of all low plants can be easily 
treated with a dry insecticide by dusting it upon them through a 
cheesecloth, or other thin muslin sack, held in the hand. There 
are also various appliances upon the market for the distribution of 
powders. One of these that is very convenient for filling the air of 
a room with dust to kill flies, or for the application of powders to 
low herbage, is shown in Fig. .15. It can be had of Thomas 
Woodason, 451 East Cambria Street, Philadelphia, Pa. 
Fig. 15.—Dust-sprayer. 
The Hillis Dust Sprayer Co., St. Louis, Mo., manufacture a 
