عنوان مقاله [English]
Considering the importance of studying the performance of commercial silkworm hybrids at the level of silkworm rearing units in different rural areas, in the spring of 2019, the 14 hatched silkworm egg boxes per hybrids (12 imported and two Iranian boxes) were delivered to skilled sericulturists in 35 eastern and 32 western villages of Guilan province and then monitored till the end of the rearing period. The random samples including 200 cocoons were purchased from each farmer to record data. The performance of each silkworm box, the percentage of good cocoons, pupal mortality percentage, number and weight of cocoons in a liter, cocoon weight, cocoon shell weight, and cocoon shell percentage were measured. The interaction between areas and hybrids was not significant for all traits (P>0.05). The highest and the lowest performance per silkworm box were for 872× 871 and 103×104 hybrids, respectively (P<0.05). The heaviest and the biggest cocoons were for 153×154 and 872×871 hybrids, respectively; and the lowest was for Baiyu×Qiufeng (P<0.01). The highest and the lowest good cocoon percentages were obtained from 103×104 and HaoyuB×JingsongA, respectively (P<0.05). The highest and the lowest cocoon shell percentages were for 103×104 and BaiyuB×QiufengA, respectively (P<0.05). Among the four studied areas, the lowest average for all studied traits belonged to the plain areas of eastern Guilan. Among the six pairs of examined reciprocal crosses (imported hybrids), the performance of 872×871 and 871×872 and Suju×Minghu and Minghu×Suju can serve the interests of both cocoon producers and silk thread producers.