Regional Identification and Rural Production Trials of a High-quality and High-yield New Mulberry Variety Chuan 7431

A new mulberry variety Chuan 7431 of high-quality and high-yield was bred through individual plant selection among a mutant population from hybrid seeds of Cangxi 49 × 6031 treated with colchicine and 60Co-γ radiation.Regional identification and rural production trials in Sichuan Province showed that this new variety had the characteristics of fast growing,late hardening of leaves in autumn,large and thick leaves,short internodes,high yield and quality,and stable hereditary characters etc.The average annual yield was 33 034.25 kg /hm2,20.26% higher than the control variety Husang 32.The silkworm rearing results were as follows: cocoon yield per 10 000 larvae 19.56 kg,cocoon shell weight per 10 000 larvae 4.61 kg,and cocoon output per 50 kg mulberry leaves 3.75 kg,being 10.37%,10.43% and 8.32% higher than the control variety Husang 32 respectively.This new variety is suitable for growing in plain and hilly areas,especially in areas vulnerable to drought in Sichuan Province.