Abstract
AbstractTropical tasar silkworm, Antheraea mylitta Drury is exploited in countries for commercial silk production and improved varieties of these silkworms can be evolved by employing various breeding techniques. As the insect has established itself in various forms of ecological populations (Commonly called as ecoraces) in different geographical niches of the country depending on food plants and micro-environmental conditions available to them, the species exists in the form of nearly 44 ecoraces (Singh and Srivastava,1997, Srivastava,2002 and Srivastava et at. 2007) distributed over different states. However, due to free interbreeding in nature for centuries, the fauna is highly heterogeneous.Tasar culture is a forest based industry being practiced as tradition, since time immemorial by the tribes of Central India, extending from West Bengal in the East to Karnataka in South. The species A. mylitta D. is polyphagous in nature. The present study comprises the ecoraces of tropical tasar silkworm of A. mylitta D. These ecoraces are mainly restricted in the tropical moist deciduous forest area where the average rainfall varies between 1200-2000 mm and the deciduous zone of the dry tropical forest area where the average rainfall has been observed to be about 1000 mm. The Primary food plants of the insects are Terminalia tomentosa, Terminalia arjuna and Shorea robusta and secondary food plants are Terminalia chebula, T. bellerica, T. peniculata, Zizyphus jujuba etc. The phenotypic and genotypic variability is very much prominent. The present review paper comprises the extent and degree of natural variation in tropical tasar silkworm A. mylitta D.
Highlights
Tasar culture is a forest based industry being practiced as tradition, since time immemorial by the tribal of Central India, extending from West Bengal in the East to Karnataka in South
The details of commercial characters of some important ecoraces are given in table2 .In technological quality no ecorace is simultaneously good for reelability, denier, silk recovery
Amylase activity was studied in non-diapausing V instar larva in the gut wall and muscle of the five ecoraces both in males and females by Kar et al (1999) and Modal occupied the first group differing from Daba which again different from Sarihan and Bhandara
Summary
The premilinary studies on the variations on economically important characters reveals that cocoon weight is highly variable from race to race and within a single race. Modal cocoons are superior in shell weight, cocoon weight. The details of commercial characters of some important ecoraces are given in table .In technological quality no ecorace is simultaneously good for reelability, denier, silk recovery. Andhra local shows the best performance so far as reelability but it is a poor yielder. Modal is the highest silk yielder but it produce coarse and heavier filament
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
