International Journal of Agricultural Policy and Research
Vol.5 (10), pp. 145-156, October 2017
Available online at https://www.journalissues.org/IJAPR/
Article 17/ID/JPR037/012/ pages
Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Field efficacy of methoprene, a juvenile hormone analogue, on growth, cocoon characters and fecundity of the muga silkworm Antheraea assamensis Helfer (Lepidoptera: Saturniidae)
K. Neog1*, P. Dutta1, B. Choudhury1 and B.K. Singh1
1Central Muga Eri Research and Training Institute, Central Silk Board : Ministry of Textiles : Govt. of India Lahdoigarh : Jorhat – 785 700: Assam, India.
* Corresponding Author E-mail: Kartik_neog(at)rediffmail.com
The 5th instar caterpillars of muga silkworm Antheraea assamensis Helfer (Lepidoptera: Saturniidae) were treated with 0.1 ppm of methoprene (JHA) to evaluate its effects under field conditions. Treated larvae produced more cocoons significantly during both Aherua and Katia seasons (79.68 % and 97.69 %, resp.), compared to the control larvae (68.37 % and 84.65 %, resp.). Significant enhancement of male and female cocoon weights (5.41 g and 6.62 g, resp.), pupal weights (4.93 g and 6.18 g, resp.), and shell weights (0.43 g and 0.52 g, resp.) were observed after methoprene treatment. The valid female moths were higher in treated (48.01 % during Katia and 44.19 % during Aherua), compared to the control (39.65 % during Katia and 36.58 % during Aherua). Methoprene significantly enhanced the female fecundity (184 nos.), compared to 135 nos. in control.
Key words: cocoon, egg, emergence, fecundity, larva, mortality, pupa