MANAGING THE HATCHING OF NON-MULBERRY ERI SILKWORM (Samia cynthia ricini) EGGS USING PHOTOPERIOD METHODS

Yuni Cahya Endrawati, Ronny Rachman Noor, Andwi Russpita, Sonia Maretha, Tri Atmowidi

Abstract


One of the non-mulberry silkworm species that has been widely cultivated is the eri silkworm (Samia cynthia ricini). The eggs of the eri silkworm are non-diapause and polyvoltine, allowing the life cycle to continue uninterrupted 8 days after oviposition. This condition challenge eri silkworm farming, as the maintenance schedule cannot yet be regulated. Photoperiod is one method that influences the embryonic development of eggs. This study aimed to evaluate the effect of different photoperiod treatments at a light intensity of 30–40 lux on the hatching regulation of eri silkworm eggs (S. c. ricini). The experiment consisted of five treatments with three replications: P0 (12L:12D), P1 (0L:24D), P2 (24L:0D), P3 (8L:16D), and P4 (16L:8D), where L represents light and D represents dark. The observed variables included the temperature and humidity of the treatment chamber, hatching percentage, hatching delay duration, embryonic development, and larval survival. In general, photoperiod treatments did not significantly affect the hatching delay duration across all treatments but successfully delayed hatching by 3.38±1.04 days. The 16 hour light and 8 hour dark photoperiod treatment (16L:8D) resulted in the lowest hatchability, at 84.00 ± 6.92%, which is suspected to be due to the treatment temperature (29.00 ± 0.50 °C) exceeding the optimal hatching temperature range (24–28 °C). The embryonic development pattern and larval viability did not differ significantly across treatments. Therefore, further research is needed to determine the optimal light intensity (within the range of 30 to 50 lux), so that photoperiod treatments can effectively influence hatching outcomes.


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References


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