3.life cycle morphology of silkworm - dr. h.b. …...life cycle of bombyx mori and morphology of...

LIFE CYCLE OF LIFE CYCLE OF LIFE CYCLE OF LIFE CYCLE OF BOMBYX MORI BOMBYX MORI BOMBYX MORI BOMBYX MORI

AND AND AND AND

MORPHOLOGY MORPHOLOGY MORPHOLOGY MORPHOLOGY MORPHOLOGY MORPHOLOGY MORPHOLOGY MORPHOLOGY

OF OF OF OF OF OF OF OF OF OF OF OF OF OF OF OF

EGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULT

Dr. Mahesha H BAssociate Professor and Head

Department of SericultureYuvaraja’s College

University of Mysore, Mysuru, India

30 December 2018 1http://hbmahesh.weebly.com

LIFE CYCLE OF BOMBYX MORI

30 December 2018 2

LIFE CYCLE OF BOMBYX MORI

http://hbmahesh.weebly.com

SEASONS OF TEMPERATE ZONE (Japan)

Middle of May to

beginning of September

Middle of September –

Beginning of November

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Natural Uni and Bivoltines are available only in this zone

Univoltines completes their life cycle during spring season (Only ONE)

Bivoltines complete their first life cycle during spring

and second life cycle during early summer


Middle of March – Beginning of May

Middle of November to

beginning of March

MV MV --------------------BVBV

EggEgg-- 99--1212----------1111--1414

LarvaLarva-- 2020--2424---- ----2424--2828

PupaPupa-- 1010--1212-------- 1212--1515

MothMoth-- 33--66--------------66--1010

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Types of EggsTypes of Eggs

Larval StageLarval Stage

MoultingMoulting

Mature WormMature Worm

Spinning of the cocoonSpinning of the cocoon

PupationPupation

Emergence and ReproductionEmergence and Reproduction


Morphology Morphology

of of

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of of

EGG, LARVA, PUPA & ADULTEGG, LARVA, PUPA & ADULT


0.90.9--1.2 mm1.2 mm

One Laying

11--1.3 mm1.3 mm

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0.550.55--0.6mg weight0.6mg weightOvaoidOvaoid/ Spherical/ SphericalFlat at ventral sideFlat at ventral sideMicropyleMicropyleRespiratory channelsRespiratory channels


3mm3mm

Silkworms At Different Ages Silkworms At Different Ages

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10cm10cm


The head

consist of six

body segments

The abdomen is comprised

of eleven body segments


body segments

fused together

with a cranium

The thorax consists

of three body segments

called the pro, meso

and meta-thorax.

HeadHeadHypognathous Hypognathous


Colored scanning electron micrograph (SEM)

of Dorasal side of the head of a silkworm larva

Mouth Parts of silkworm

Colored scanning electron micrograph (SEM)

of ventral side of the head of a silkworm larva


Morphology of silkworm larvaMorphology of silkworm larva


Coloured scanning electron

micrograph (SEM) of silkworm proleg

Abdomen


Sexual Marking at larval stage (Sexual Marking at larval stage (For identificationFor identification))


PUPA

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Sexual Marking at Sexual Marking at PupalPupal stagestage


MothMoth

Female and Male mothsFemale and Male mothsPaired Female and Male mothsPaired Female and Male moths

Female and Male mothsFemale and Male moths

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Female mothFemale moth Egg laying Female mothsEgg laying Female moths


Sexing at Moth stageSexing at Moth stage

Knob like Ovipositor in female mothKnob like Ovipositor in female moth

Claspers in male mothClaspers in male moth


Acknowledgements/References

to

1. Internet

2. Sericulture Manual II, FAO, Rome.

30 December 2018 17www.hbmahesh.weebly.com

3.life cycle morphology of silkworm - dr. h.b. …...life cycle of bombyx mori and morphology of...

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