6 
For these insects direct poisons, such as the arsenicals, which may 
be safely applied to the leaves or other parts of the plant attacked, 
> 
mE» 
y, 

Fic. 1.—Illustrating the different classes of biting insects. 
natural size. (Author’s illustration.) 

and which will be swallowed by the insect with its 
food, furnish the surest and simplest remedy,’ and 
should always be employed, except where the parts 
treated are themselves to be shortly used for the food of animals or 
of man. 
INJURY FROM SUCKING INSECTS. 
The sucking insects are those which injure plants by the gradual 
extraction of the juices from the bark, leaves, or fruit, and include 
the plant-bugs, aphides, scale insects, thrips, and plant-feeding mites. 
These insects possess, instead of biting jaws, sucking beaks or bristles, 
which are thrust down through the outer layers of the bark or leaves 

A iA RRS 
DZD 
Fic. 2.—Illustrating the different classes of sucking insects. Natural size and enlarged. 
(Author’s illustration.) 
into the soft, succulent tissues beneath and used to extract the plant 
juices, with a resulting injury not so noticeable as in the first group, 
but not less serious. (See fig. 2.) 
127 
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