The present investigations were carried out during two spring seasons, 2015-16 in the silkworm laboratory of Sericulture Department of Plant Protection Research Institute, Sharkia Branch to investigate the effect of 4 concentrations of lemon, sweet orange juice and ascorbic acid (1%, 2%, 3%, 4%) on silk production of mulberry silkworm Bombyx mori L.The obtained results cleared that the highest concentration (4%), for lemon juice sweet orange juice and ascorbic acid gave the highest mean of fresh cocoon weight, shell cocoon weight and silk ratio. On the other hand, the high concentration of sweet orange (4%) recorded the highest mean of silk filament weight and size, whereas the highest concentration (4%) of ascorbic acid and lemon gave the highest mean of silk filament length. Lemon juice, sweet orange juice and ascorbic acid improved cocoon indices and silk filament characters as a profitable supplementary diet for silk worm Bombyx mori L.Conclusively, the highest concentration (4%) of ascorbic acid and lemon gave the highest mean of silk filament length. Lemon juice, sweet orange juice and ascorbic acid improved cocoon indices and silk filament characters as a profitable supplementary diet for silk worm Bombyx mori L.

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