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아이콘 Silkworm Germplasm 아이콘 Home > Silkworm Germplasm > Silkworm Germplasm
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Description of Silkworm Brushing Rearing of young silkworms
Rearing of advanced silkworms Mounting Cocoon harvesting and sorting
 
1. Description of Silkworm
Sericulture is concerned with the Bombyx mori or mulberry tree silkworm. The various features of the silkworm at different stages of development are examined blow.
 
ㅇNewly-born worm ('ant worm')
 

The newly-hatched worm had 13 segments and resembles tiny black ants at a dlance because of dense black bristles on the body, thus called ant worm.

     
 
ㅇFront view of larval head
 

Six pairs of ocelli are located at the base of the antenna to sense lightness. Around the mouth, there are two antennae to smell, maxilly palp to taste and a spinneret to spin silk filament.


     
 
ㅇSide view of larval head
 

The six pairs of ocelli are situated at the base of the antennae and sense the light density (but do not identity image). One pair of mandibles to bite the mulberry leaves.

     
 
ㅇAdult larva (5th instar)
 

At the peak of itts growth, after feeding on mulberry leaves for 23-25 days, the larva weights 506 grams, ten thousnad times the weight of newly-hatched larvae.

   
 
ㅇSexual features
 

Female silkworm larvae, pupae and moths are larger than the male.
A pair of round milky spots are located on each abdominal side, 11th and 12th segment in females.
There is a milky spot on the border of the 11th and 12 segment in males.

     
 
ㅇPupal stage
 

Femle pupae can be distinguished from males by the "x" shaped groves at the abdominal cent

     
 
ㅇMoth stage
 

A pair each of prominent antennae and compound eyes are on the heads of moths. There are 3 pairs of thoracic legs and two pairs of wins on the thorax. Moths can not fly, but the males are more active in movement than females.

 
2. Life Cycle of Silkworm

The silkworm egg hibernated during winter will hatch in spring when the mulberry sprouts. It goes through 4 mults before reaching maturity and takes 48-72 hours to spin its sosoon. In 2-3 days it transforms into a pupa and another 10 days emerges as a moth. Emerence takes place in the morning when copulation also occurs. The female lays eggs from evening to next morning and dies within 4-5 days after emergence.The moth lays 500-700eggs (100 eggs weigh about 60mg). Under the natural cycle the silkworm which produces ond generation a year is called univoltine, bivoltine if there are two and multivoltine if there are more. In thropical zones the common variety is multivoltine : under favourable rearing conditions the larvae are very resistant but they produce small cocoons and consequently the quality of the silk is lower than the temperate varieties which are usually uni- or bi-voltine.

       
 
Incubation
13-14 days (15℃, 3 days after 24-25-26℃)
  Silkworm body Silkowrm glands
1st 20 30
2nd 120 70
3rd 730 220
4th 2640 1800
5th 10,000 140,000
 

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