.STUDIES ON REARING TECHNOLOGY OF EARLY INSTARS OF SILKWORM, Bombyx mori L

Abstract

carried out on the early instars as follows: Increasing of silk yield is the main objective of sericulturists, also period. Therefore decreasing of larvae losing in the young instars with decreasing in larval the present study aims to study the effect of mulberry leave varieties, mulberry leave quality or maturity , rearing box types, larval density, relative humidity and light regimes on some biological aspects and productivity of silkworm Bombyx mori L. Experiments were 1- Mulberry leaf varieties experiments: From hatching till spinning cocoons, larvae fed on fresh mulberry leaves of four varieties as follows: a- Indian Variety. (Marus alba var. Kanava-2). b- Japanese Variety; (Morus alba var. Kokousu-27). h, c- Roomy variety. (Morus alba var. Morittiana). d- Local variety. (Morus alba var. Rosa). Larvae in young instars reared in trays which divided into a small squares of (25 x20) withl0cm border, and in late instars rearing, it were converted to trays divided to squares of( 50 x35) with l0cm border. 2- Mulberry leaf quality experiments: In the first · three instars larvae fed with mulberry leaves of different maturity level as follows: tender, medium and coarse leaves, then larvae transferred to the late instars trays and fed on medium leaves in all treatment till spinning cocoons.