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, 
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Fic. 1.—Illustrating the different classes of biting insects, all natural 
size (original). 
tt and which will be swallowed by the insect with its food, 
7 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 other animals or 
of man. 
INJURY FROM SUCKING INSECTS. 
The sucking insects are those which injure plants by the gradual 
extraction of the juices, either from the bark, leaves, or fruit, and 
include the plant-bugs, plant-lice, scale insects, thrips, and plant-feed- 
ing mites. These insects possess, instead of biting jaws, sucking beaks 
or bristles, which are thrust down through the outer layers of the bark 
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Fie. 2.—Ilustrating the different classes of sucking insects, natural size and enlarged (original). 
or leaves 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.) 
For this class of insects the application of poisons, which penetrate 
little, if at all, into the plant cells, is of trifling value, and it is neces- 



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