identify insect pests part i
Post on 09-Jun-2015
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Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
1. Silverfish/Lepismatidae/Thysanura
Cerci
Median caudal filament
Fig. Silverfish
Body covered with silvary scales.Last abdominal segment bears a pair of cerci and a median caudal
filament.Antenna long and filiform.
Filiform antenna
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
2. Dragonfly/Aeshnidae/Odonata Eye contagious
Fig. Dragonfly
Body stout and robust. Wings dissimilar, i.e. the base of the hind wings are broader than the base of the fore wings.
Wings held horizontally when at rest. Compound eyes larger and contagious.Stigma present at apex of the each wing.
Base of the hind wing broader than the base of the front wing
Wings dissimilar
Stigma present
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
3. Damselfly/Coenagrionidae/Odonata
Body slender.Both wings similar. Compound eyes larger but separated. Stigma present on each wing.
Eyes separate
Fig. Damselfly
Both wings similar
Body slender
Stigma present
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
4. Short horned grasshopper/Acrididae/Orthoptera
Hind leg jumping type
Fig. Short horned grasshopper
Body stout and robust. Wings dissimilar, i.e. the base of the hind wings are broader than the base of the fore wings.
Wings held horizontally when at rest. Compound eyes larger and contagious.Stigma present at apex of the each wing.
Wings: tegminaFilliform antenna
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
5. Long horned grasshopper/Tettigoniidae/Orthoptera
Fig. Long horned grasshopper
Antenna longer than body and and filiform.Ovipositor sharp, flattened and blade like structure.Hind leg jumping type and tarsi 4 segmented.
Ovipositor blade like
Antenna longerThan the body
Wings tegmina
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
6. Field Cricket/Gryllidae/Orthoptera
Fig. Field cricket
Body large dull, usually pale, brownish or black in color.Ovipositor long needle like.A pair of unsegmented cerci present.Fore wings modified into tegmina.Hind leg jumping type.
Ovipositor needle like
Dull, pale colored body
Wings tegmina
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
7. Mole Cricket/Gryllotalpidae/Orthoptera
Fig. Mole cricket
Robust body.Ovipositor short and vestigial.Front leg greatly enlarged and modified for digging.A pair of long unsegmented cerci present.Fore wings modified into tegmina
Ovipositor vestigialWings tegmina
Front leg digging type
Robust body
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
8. Earwig/Forficulidae/Dermaptera
Cerci modified into Forcep like structure
Fig. Earwig
Cerci modified into forcep like structure.Fore wings short, modified into tegmina and hind wings semi circular and folded beneath the tegmina.Antenna short and filiform.Tarsi 3 segmented.
Tegmina shortFilliform antenna
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
9. Cockroach/Blattidae/Dictyoptera
Body oval
Fig. Cockroach
Body oval, flattened, head partly or completely covered by the shield like pronotum.Antenna longer than the body filiform.Cursorial or walking and running type leg.Fore wings modified into tegmina, hind wings membranous.Mandibulate mouthparts, chewing type
Shield shaped pronotumFilliform antenna
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
10. Preying mantid/Mantidae/Dictyoptera
Pro thorax greatlyelongated
Fig. Preying mantid
Head movableProthorax greatly elongated.Fore leg raptorial type adapted for grasping prey.
Fore leg raptorialOr grasping type
Head movable
Sylhet Agricultural University
Department of
EntomologyChandra Kanta Dash (Assistant Professor)
11. Termite/Termitidae/Isoptera
Broad junction between Thorax and abodomen
Fig. Termite
Broad junction between thorax and abdomenAntenna moniliform, multisegmented.Workers with larger head and prominent mandible.Winged or wingless; winged formed with two pair of wings similar in size and shape, held flat over the adomen at rest.Mouthparts chewing type.
Antenna moniliform
Prominent mandible in worker
Wings similar when present
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