Insects damage plants in three main ways: 1) By chewing portions of plants like leaves, stems, flowers and fruits using horn-like jaws, as seen in grasshoppers, caterpillars, and beetles. 2) By sucking plant juices and nectar using a sharp, hollow proboscis, including aphids, plant lice, and squash bugs. 3) By lapping liquids from outer surfaces using specialized mouthparts, such as apple maggots and cherry fruit flies.

1. WAYS HOW INSECTS
DAMAGE PLANTS

2. 1. BY CHEWING
Insects feed by chewing some portions of
the plants like leaves, stems, flowers and fruits.
They have horn-like jaws, which they use for
biting and chewing. Grasshoppers, caterpillars,
grubs and beetles are examples of theses
insects.

3. JAPANESE BEETLES
Consume entire leaf including
midribs and veins
Notching the sides of the leaf margins
ASH WEEVIL

4. LEAF CUTTER BEE

5. 2. BY SUCKING
Insects also nourish themselves by sucking
plant juices and nectar. These are characterized
by sharp, slender, hollow beaks, which they insert
under the surface of plants to suck their juices.
This mouth part is called the proboscis. San Jose
scales, aphids, plant lice, squash bugs and other
tree bugs are sucking insects

6. APHIDS

7. WHITEFLIES

11. 3. BY LAPPING
Mouthparts of these insects enable them
to lap or lick liquids from the outer surfaces of
objects on what they feed. Apple maggots and
cherry fruit flies are example of lapping insects.