New Update Sericulture

                                   
Sericulture. https://cststudy.blogspot.com/

                                

Sericulture

The culture of silkworm moth for commercially silk purpose is known as 
sericulture. It include both rearing of silkworm and moriculture (mulberry 
culture).

Types of Silkworm

1. Mulberry silkworm: Bombyx mori.
2.  Eri Silkworm: Philosamia Cynthia.
3.  Tasar silkworm  
♦  Indian tasar: Antheraea mylitta.  
♦  Chinese tasar: Antheraea pernyi.  
♦  Japanese tasar: Antheraea yamamai. 
4.  Muga silkworm: Antheraea assamensis. Beside these, there is a special type of silkworm known as Fish line silkworm: Eriogyra pyretorus.

Food plants for silkworm

1.  Mulberry silkworm: Mulberry plants.
2.  Eri silkworm: Castor leaves. Besides, Cassava, Papaya, Sweet potato, Champa etc. 3.  Tasar silkworm  
♦  Indian tasar: Asam, Arjun.  
♦  Chinese/Japanese tasar: Oak leaves. 4.  Muga silkworm: Leaves of som and soalu. 5.  Fish line silkworm: Liquidambar formosana.(Growing in Hawaii Island)

Difference between Mulberry silkworm and Eri silkworm        

Mulberry silkworm                              Eri silkworm 
1. Thread continuous.                         1. Thread discontinuous. 
2. Fine silk.                                         2. Coarse silk.
3. Small cocoon size.                          3. Large cocoon size. 4. Comparatively low product.           4. High product.

Classification of mulberry silkworm 

Mulberry silkworm is classified may various ways

▲ On the basis of origin or regional distribution
1.  European silkworm. 
2.  Japanese silkworm. 
3.  Chinese silkworm.
4.  Indian silkworm.

▲ On the basis of generation per year 1.  Univoltine: This type of silkworm produce one generation per year. 2.  Biovoltine: This produce two generation per year. 3.  Multivoltine: In this case more than two (5­8) generation produce per year.

▲ On the basis of larval moult
1.  Tri­moulters.
2.  Tetra­moulters (In Bangladesh).
3.  Penta­moulters.

▲ On the basis of strains
1.  Pure strains.
2.  Hybrid strains.
a. Monohybrid: When two strains are involved. 
b.  Polyhybrid: When more than two strains are involved. 

Races of Silkworm

a) Nistari: C/40.
b) Nistari: Nawabganj.
c) Nistari: Mirganj.
d) Nistari: Chandraghona.
e) Nistid: White.
f) Nistid: Sylhet. 

Sketch the outline of Life Cycle of Mulberry silkworm




















Fig: Life cycle of Bombyx mori

Comments

Post a Comment

Popular posts from this blog

New Update Methods of Fertilizer Application

Image
Methods of Fertilizer Application. https://cststudy.blogspot.com/ B.Sc.Ag. (Hons) Part-I  Methods of Fertilizer Application Fertilizer recovery is greatly influenced by method of its application. Method of application varies according to the spacing of crop, type of fertilizer material, time of application, etc. A brief account of these points could be explained as under : A.Method of application of solid fertilizer materials Solid materials may be applied in following ways: 1. Broadcasting Even and uniform spreading of dry solid fertilizers by hand or spreader over the entire field before or after sowing of the crop is termed as broadcasting. Well decomposed FYM, compost, oil cake, bone meal, urea, superphosphate and lime are applied by this method. Advantages This method is easy, less time taking, cheap and more convenient to the farmers. This method proves effective- i.                      When the crops have a dense stand ii.                   
Read more

New Update Seed dormancy and its importance

Image
Seed dormancy and its importance. https://cststudy.blogspot.com/                                                Seed Dormancy Definition:   The term dormancy refers to lack of growth in any plant part due to either internally or externally induced factors. Seed technologist use the term of refers to non-germination resulting from conditions within the seeds.  Dormancy is the state of inhibits growth of seeds or other plant organs as a result of internal causes not due to environmental condition. In other word, the unavailability of well developed mature, perfectly viable and healthy seed to germinate when placed under favorable conditions for germination is called dormancy or rest period of seed. Important of seed dormancy: 1. It is a mechanism which helps to survive this species. 2. It prevents the germination of seed in the field during production. 3. Dormancy helps to store the seed in the store house. 4. It contributes the congivity of the species.
Read more

HOw To HORTON HEARS A WHO FLOWERS IN BLOOM

Image
For some reason, these don't always appear at the farm each Spring.  Because of that, we love that somehow they are rarer than the other things popping up on a regular basis.   Dr. Seuss flower? Sure enough, last weekend, they were in a few patches around the farm.  The first time we ever saw one, the FIRST thing we both said was... HORTON HEARS A WHO!!!!!!! The iconic Dr. Seuss character who finds a whole world living on a speck on an awesome looking pink and yellow flower.  Horton Hears a Who flower The only thing missing on ours are the striped stems, ha.  They are SO pretty and so unusual, even if it is "just a weed", we love having them around.   I thought about cutting some to put in a small vase and see how long they last...and maybe we'll just have to start listening a little closer to them. Hmm, just thought about it, maybe I should try to press some in my flower press? 
Read more