Atypical voltinism in mulberry silkworm Bombyx mori L., 1758 (Lepidoptera: Bombycidae) races Barapat and Barapolu

Kiran Rudramuni; Shiv Kumar; Bharath K. Neelaboina; Mir N. Ahmad; Sukhen R. Chowdhury

doi:10.37486/2675-1305.ec03001

Authors

Kiran Rudramuni Silkworm Division, Central Sericultural Research and Training Institute, Central Silk Board, J&K, India https://orcid.org/0000-0003-3372-2918
Shiv Kumar Silkworm Division, Central Sericultural Research and Training Institute, Central Silk Board, J&K, India https://orcid.org/0000-0002-0018-4001
Bharath K. Neelaboina Silkworm Division, Central Sericultural Research and Training Institute, Central Silk Board, J&K, India https://orcid.org/0000-0003-1338-8449
Mir N. Ahmad Silkworm Division, Central Sericultural Research and Training Institute, Central Silk Board, J&K, India https://orcid.org/0000-0002-4064-9950
Sukhen R. Chowdhury Silkworm Division, Central Sericultural Research and Training Institute, Central Silk Board, J&K, India https://orcid.org/0000-0002-3674-8841

DOI:

https://doi.org/10.37486/2675-1305.ec03001

Keywords:

Diapause, non-diapause, temperate, univoltine

Abstract

The mulberry silkworm, Bombyx mori L., 1758 (Lepidoptera: Bombycidae) is classified as univoltine, bivoltine, and polyvoltine based on the annual brood frequency. Voltinism in B. mori is characterized by the occurrence of embryonic diapause (facultative and obligatory diapause). Univoltine silkworms suited to cold and temperate regions lay diapausing eggs and polyvoltine silkworms suited to tropical regions lay non-diapausing eggs. In contrast, the occurrence of diapause in bivoltine silkworms is influenced by the environment. In addition to the difference in the occurrence of embryonic diapause, larval duration, and cocoon characters show distinct variations. In the present correspondence, we are presenting an interesting observation from two silkworm races Barapath and Barapolu originating from the North-East region of India that display divergence in voltinism. The unique characteristic features of univoltine, bivoltine, and polyvoltine observed in the races are discussed explaining the occurrence.

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