LIFE CYCLE OF ERI SILKWORM PDF
Samia ricini, or the Eri silkworm, is raised in India and parts of the Orient for its silk. They will be a couple of days behind all the way through their life cycle. Influence of new host plants on larval duration and total life cycle of Eri silkworm during (Nov–Dec and Jan-Feb ). 3. Influence of new host plants on. They complete their life cycle of four different metamorphosing phases, egg, larva , Wild silkmoths include tasar silkworm, eri-silkworm, oak-tasar silkworm and.
|Country:||Sao Tome and Principe|
|Published (Last):||6 August 2013|
|PDF File Size:||14.42 Mb|
|ePub File Size:||13.34 Mb|
|Price:||Free* [*Free Regsitration Required]|
The moth is multivoltine the entire life cycle lasts for about 50 days in summer and days in winter. The pupa is finally metamorphosed into young adult moth in about days. Some are light green, others are yellow, and some are grey and others almost white Fig. Firstly, the filaments of the Silk are due to the peculiar structure of the cocoon in two respects.
The 2nd stage larvae resemble the 1st stage larvae except ccyle they are slightly bigger in size.
Samia ricini, the eri silkworm
The worm at the center top hasn’t changed his skin yet, but you can tell it will happen soon, because it is tight and shiny. It is also unique because it contributes to the production of a highly priced silk. They grow rapidly, eat voraciously and end up about 30 mm long after weeks. Ericulture is a small scale industry. Ecdysone is secreted by prothoracic gland.
After sixteen days in the cocoon, it’s hatching time! The specialty of this silk is its golden bright colour. Butterflies and moths of North America. The worms after hatching start feeding the leaves. Success has been achieved in this regard to some extent. Further back, on some of the abdominal segments, are the prolegs, which have strong gripping ends to help the caterpillar stay on the leaves.
The distance between two samplings should be 20—25 ft.
Life Cycle of Various Silk Moths
The cocoons are open mouthed, tapering at one end and flat rounded at the open end. So they are cultivated in places where their host plants are available. They are mounted on the bushes of the host-plants already prunned for the purpose. The cocoons are generally yellow or grey. Extraction of Silk thread from the cocoon is different here than the other Silk types. Native of Assam and named after Assamese word “muga” which indicates the amber brown colour of cocoon.
Wide disritbution and polyphagy of this insect species had resulted in extensive variation in the population.
Stifling is done by spreading and exposing the cocoons to the sun silkwor, 1 -2 days. With the change to the third instar, they begin to look very different. The eggs are ovoid, candid white.
When the adult moth emerges from a cocoon it makes a hole to get out. Here, you can see two first-instar worms, and two newly-emerged second instar worms. The cocoon is golden brown or glossy white. The larvae immediately crawl and start feeding on leaves. These Cocoons are kept in well ventilated cages. They are transferred to feeding trays already supplied with chopped tender leaves of mulberry.
Rearing of Silkworms: Life Cycle and other details on Silkworms
Hatching takes place in the morning after ten days of incubation. From the third instar onward the body colour segregates into yellow, cream, green, blue or white.
For this it should be well plastered with cow-dung or mud at regular intervals. Each female can lay about eggs [Fig. The thorax is 3 segmented and all the segments bear a pair of true jointed legs. Caterpillars lkfe feed on leaves of trees and shrubs; some cause severe damage.
If they suffer from any disease, the eggs laid by that particular moth are destroyed. The body colour changes gradually to pure yellow by the end of the third day.