Classification of insect pest

Summary

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> Classification of Insect Pest
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2. A e ALA 1)
> Classification of Insect Pest
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3. In layman terms pest is the organisms that disturbs the
human life.

Scientific definition of pest is that those organisms
which damage our cultivated plant, our forest, storage,
domestic

product including other aesthetic qualities are called
pest.

The pests are those organisms which harbor in cultivated
crops that reduce quantity and
quality of crops.

4. One way to classify insect pests is by
the damage thon Paute]

Defoliators
Skeletonizers
Sapsuckers
Bark borers

5. Defoliators eat a tree’s
leaves or needles. Heavy
infestations of these insects
can strip the leaves from

entire stands of trees.
Without leaves or needles,
trees cannot make the sugar
they need to grow.

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7. Skeletonizers eat all
of the leaf except the
veins. These insects
dig between the upper

and lower leaf surfaces
or eat all but the
upper surface, leaving
only a thin layer of
cells.

8. Be a

Promecotheca c ngii

a < > Sat s
RETTEN ‘

Eutectona machaeralis

9. Sapsuckers are insects that
draw sap and plant juices
from trees using their
hollow, straw-like mouth
parts. They feed on needles,

leaves, shoots or
stems.Leaves will have a
crinkled appearance and
generally are smaller after
the sapsuckers feed.

10. [620 À ~ 44) x
Aspidiotus rigidus Idioscopus nitidulus
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11. Bark borers

Bark borers are insect
pests that feed on the
Cambium and inner bark of
a tree, disrupting the
transport of water and
nutrients. Many bark

borers attack only trees
weakened from disease or
drought.

13. On the basis of host association:

Monophagous insects
Oligophagous insects
Polyphagous insects

14. a. Monophagous insects: These insects
depends only one species of plants for
whole life-cycle.

Eg. Hypothenemus hampei (coffee berry
borer)

16. b. Oligophagous insects:
Confined only one family for
the whole life-cycle
Eg.Hypsipyla robusta on

University of Florida

17. c. Polyphagous insects: Many
agricultural pests fall on
polyphagous pests. Those insect-
pests visit the diverse plant
species to complete the
lifecycle.

Eg., Apate monachus

18. O Y Y

Can You Count The Squares In This Puzzle?

19. On the basis of Biological
characteristics:

20. a. r- pest: Those
species which
possess high

fecundity and
strong dispersal
eg.aphids, locusts

21. b. k- pest: Low
fecundity, low
dispersal, larger body
size

eg., all stem bugs

22. c. r-k pest: Mixer
characteristics of r-k pest
eg. all the Dipteron

23. | On the basis of Metamorphosis

24. Ametabola:

No or simple metamorphosis
There is no difference between adult

and im-matures except size and some
internal developmental process
Egg- Young- Adult

Ametabolous
Development

eed RAE

Young Adult

25. Paurometabela

The immature is not well distinct with mature
stage

Eg.grasshopper and crickets

Egg-Nymph-Adult

They lay eggs in bunds of fields.

Only 5% agricultural insects fall on this.

Paurometabola

om a

26. Hemimetabola

Incomplete metamorphosis
The im-matures are aquatic and bear
gills for breathing

They differ from adults in appearance
Eg: mayflies, dragonflies etc
Egg- Naid- Adult
Hemimetabolous _ ER
EN Adult:
Development = a

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Ÿ # AN “a sy,
Eggs ASH =
Nymphs Adult

27. About 90% insects of economic
importance fall in it.
The stage is completely differ
from one another
Eg., all the Lepidopteron,
Coleopteron, Hymenopteron

Holometabolous

ul a

Larvae

Pupa adutt

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» Classification of Insect Pest