(i) Karnataka is the largest producer of mulberry silk because 1. Temperature in this region ranges between 16°C to 30°C which is favourable for rearing silk worms. 2. Enough fresh water free from alkaline salts for the processing of silk fibre is also available. (ii) Two varieties of non mulberry silk—eri and muga. (iii) U.P. — Banaras, Tamil Nadu – Tanjore.