Regional Tasar Research Station

Baripada, India

Regional Tasar Research Station

Baripada, India
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Shantibala T.,Institute of Bioresources and Sustainable Development | Victor T.,Institute of Bioresources and Sustainable Development | Luikham R.,Regional Tasar Research Station | Arunkumar K.P.,DNA Diagnostics Center | And 3 more authors.
Mitochondrial DNA | Year: 2016

The saturniid silkworm species of the genus Samia are potential silk producing insects. Thus, Samia canningi (Lepidoptera: Saturniidae) is a potential candidate to introduce for silk production. The complete mitochondrial genome of S. canningi was 15,384 bp long that contained 37 genes along with a control region. The arrangement of the PCGs was same as the majority of Lepidoptera, presenting the order, trnM/trnI/trnQ between nad2 and control region. Twelve of 13 PCGs started with ATN codons, but cox2 with GTG, which is often found in insects. Genes overlapped in a total of 29 bp, 221 bp of intergenic spacer sequences was found in seventeen regions and the longest 54 bp one was found between trnQ and nad2 as typical in Lepidoptera. In lrRNA, the 21-bp long, tandemly duplicated repeat was characteristically found (TAAAATTATTTATAATATAAA) between 13,663 and 13, 706. AT rich region has the motif “ATAGA” and 18 bp poly T stretch, typically conserved in Lepidoptera. © 2014 Informa UK Ltd.

Sahay A.,Regional Tasar Research Station | Sharan S.K.,Regional Tasar Research Station | Satpathy S.,Regional Extension Center
Indian Silk | Year: 2011

The Self-Help Group concept introduced in 1994 by CORD is gradually gaining its ground in tasar growing areas of Odisha. The collective and coordinated efforts have helped the tasar rearers not only to enhance the productivity, but also to enjoy self-sustenance, say the authors.

Somen Singh L.,Regional Tasar Research Station | Debaraj Y.,Regional Sericultural Research Station | Ibotombi Singh N.,Conal Muga Eri Research and Training Institute | Ray B.C.,Zonal Silkwork Seed Organisation | Singh R.,Silkworm Seed Technology Laboratory
Indian Journal of Sericulture | Year: 2012

Six breeds of the eri silkworm, Samia ricini Donovan viz., Yellow Plain (YP), Greenish Blue Plain (GBP), Yellow Zebra (YZ), Greenish Blue Zebra (GBZ), Yellow Spotted (YS) and Greenish Blue Spotted (GBS) were subjected to estimate their general combining ability in breeds and specific combining ability in the hybrids crossed in a 6 x 6 diallel fashion. The analysis of variance for combining ability of nine yield contributing traits manifested significant GCA variances in all the traits except absolute silk yield, while significant SCA variances were observed in seven parameters. Significant reciprocal variances were observed in all the nine parameters which were the indication of maternal effects in these traits in eri . silkworm. Among the six breeds, Yellow Zebra was found to be the best general combiner which exhibited significant effects in seven traits followed by Yellow Plain for six traits and Greenish Blue Zebra in five traits. Among the hybrids, YP x GBZ and YZ x GBS showed significant SCA effects for six traits. Observations on reciprocal crosses revealed significant effects by GBZ x GBP in seven traits. The hybrids YP x GBZ and GBZ x GBP have been identified for further trial rearing for higher production of eri silk. Importance of this study has been discussed in the paper.

Sahay A.,Regional Tasar Research Station | Satpathy S.,Research Extension Center | Sharan S.K.,Regional Tasar Research Station
Indian Silk | Year: 2012

To help arrest the declining trend in tasar production in Odisha, seen in last few years, cluster-based project approach has been adopted to improve the production and productivity by ensuring support and technical guidance to the stakeholders. Creation of network, and interest among tasar farmers has helped them to work collectively with increased efficiency.

Luikham R.,Regional Tasar Research Station | Keisa T.J.,Regional Tasar Research Station | Rana B.,Regional Tasar Research Station | Singh K.C.,Regional Tasar Research Station
Indian Journal of Sericulture | Year: 2011

Oak tasar seed cocoons produced during spring crop were preserved for about 255 ± 9.99 days from June to January next year under three different temperature schedules and relative humidity 75±5% in BOD incubator/Environmental Test Chamber. Maximum stray moth emergence during preservation was recorded in the month of December (1.93%) and January (1.33%) in schedule two and there was no emergence in schedule one and three during the period. Seed cocoons preserved at 150C for 150 days (June to October) might have initiated termination of pupal diapause as a result of which stray emergence was observed even though the seed cocoons were preserved at 5 0C in schedule 2. Control batch showed stray moth emergence from June (0.08%) to January (2.57%) and total moth emergence was 9.76%. Among three schedules, total maximum stray emergence (5.06%) and pupal mortality (16.13%) were noticed in schedule two resulting in low recovery of seed cocoons (78.81%). Maximum seed cocoon recovery (89.06%) was recorded in schedule three, showing significant difference (P<0.05) among the three different schedules and control. Normal grainage operation of preserved cocoons showed significant difference (P<0.05) among the three different schedules and control. Its bioassay also exhibited significant difference in hatching, larval duration and cocoon weight among the three different schedules and control. The overall performance of schedule three is better than the rest.

Luikham R.,Regional Tasar Research Station | James Keisa T.,Regional Tasar Research Station | Singh K.C.,Regional Tasar Research Station
Indian Journal of Sericulture | Year: 2012

Effect of altitudinal variation on the moth emergence pattern during oak tasar seed cocoon preservation was observed from June to January at different altitudes namely, low (785m ASL), middle (1200mASL) and high (1750m ASL) altitudes. Erratic emergence of oak tasar moth started from the month of June onwards up to January showing a total moth emergence of 9.76 ± 2.42%, 21.23 ± 7.78% and 23.37 ± 2.68% at low, middle and high altitudes respectively. The percentage of moth emergence gradually increases as the time advanced, indicating the development of pupa to moth by terminating the pupal diapause due to the influence of physical and abiotic factors. The seed cocoons preserved at higher altitudes (1200-1750m ASL) observed bivoltinism tendency. The normal grainage performance of seed cocoons preserved (spring to spring and autumn to spring) at different altitudes shows significant difference of moth emergence. The seed cocoons of autumn crop (2nd crop) preserved at different altitudes of low, middle and high from the month of November to January showed no erratic moth emergence, only pupal mortality ranges from 8.40 ± 2.79% to 13.12 ± 3.45%. Bioassay of preserved seed cocoons at their respective place of preservation performs significant difference in hatching percentage and larval duration in relation with maximum temperature. However, there is no difference in effective rate of rearing irrespective of altitudes.

Mahobia G.P.,Regional Tasar Research Station | Yadav G.S.,Regional Tasar Research Station | Singh B.M.K.,Central Tasar Research and Training Institute | Sinhadeo S.N.,Central Tasar Research and Training Institute | Vijayprakash N.B.,Seribiotcch Research Laboratory
Indian Journal of Sericulture | Year: 2010

'Rally' is an eeorace of tasar silk insect Antheraea mylittu D. (Saturniidae: Lepidoptera). endemic to Bastar plateau of Chhattisgarh, India. Il feeds primarily on the leaves of Sal (Shorea robustu Roxb.). The present study confers the correlations between the quantitative traits of male cocoons, female cocoons and traits in the sex pooled samples of cocoons collected from seven ecopockets of the habitats of Raily. The magnitude of association between the cocoon weight, shell weight, pupa weight, shell%, cocoon length, cocoon breadth, cocoon volume in the male cocoon, female cocoons and sex pooled samples of all seven ecopocket differs. The relation between cocoon weight and pupa weight exhibited higher degree of positive significant correlation (p<0.001). Increase in cocoon weight confers negative association with silk % in all the ecopockets, except Geedam, when sex pooled samples were computed for the association considering cocoon weight as independent variable and silk % as dependent variable. The magnitude of association varied between sexes, seasons and ecopockets can be considered as an effective parameter for selective breeding.

Mishra P.K.,Research Extension Center | Sharan S.K.,Regional Tasar Research Station | Kumar R.,Central Tasar Research and Training Institute | Sinha M.K.,Central Tasar Research and Training Institute | Jaishankar C.,Central Tasar Research and Training Institute
Journal of Advanced Zoology | Year: 2013

Daba bivoltine ecorace of tropical tasar silkworm Antheraea mytitta is commercially exploited in tropical India for production of tasar silk. Its Daba bivoltine ecorace remains under facultative pupal diapause for 210-225 days. Diapause sets in this economically important insect up to 60 days. Its true or refractory period of diapause has been worked out to be 60-180 days when pupae are very less responsive to external stimuli. Its termination period of diapause has been worked out to be beyond 180 days. In the present study, an attempt has been made to see the impact of low temperature treatment on the pupae of diapause termination period on adult emergence pattern, diapause period and other grainage parameters. The diapausing pupae of 180,190,200 and 210 days age were given temperature treatment of 10,15,20 and 25°C. Among 180 days old pupae treated at 10°C, prolongation and scattered moth emergence over a period of 38 days was observed. Among the same lot pupae treated at 15°C, moth emergence was also observed to be scattered but with little reduced emergence span (34 days). Similar responses were also observed among 190 days old pupae. Among 200 and 210 days old pupae kept at 15°C, the emergence of moths was delayed with comparatively less peak period of emergence in comparison with control. The overall emergence was postponed up to three weeks without adverse impact on main grainage parameters. Summarily, it can be said that the diapause pupae which were in more advanced stage of pupal-adult development during termination period of diapause (195-205 days) in Daba BV were more sensitive to temperature at 15 & 20°C.

Singhvi N.R.,Regional Tasar Research Station
Plant Archives | Year: 2014

Tasar sericulture, the production of tasar silk, is an agro-based enterprise. Its major production phase consists of two biological processes of growing/maintaining Tasar food plants and carrying out rearing of Tasar silkworm, Antheraea mylitta D. Asan, Terminalia tomentosa W & A, is one of the primary food plants. The silk quality and quantity produced by Tasar silkworm depend upon nutritional value of their food plants. With introduction of new technologies in past few years' production and productivity levels in Tasar sericulture has gone up substantially. However, it is rare that fertilizers and manures are supplied to soil by the Tasar Sericulturists, as the Tasar silkworm rearing is done outdoor on natural forest plantation. This has led to exploitation of soils, thus affecting quality and quantity of produce. Present work was taken up to investigate the effect of soil application of vermicompost on leaf production and Tasar cocoon production. Study was carried out at field Khapa of RTRS Bhandara, during 2011-12, on existing natural plantation of T. tomentosa for three crops viz., I, II and III. Freshly prepared vermicompost was supplied to Asan plants @ 2.0 kg/plant. Soil application of vermicompost resulted in 9.75, 9.09 and 8.06% improvement in leaf yield over control during I, II and III crop period, respectively. Rearing of Tasar silkworms on treated plants, that were supplied with vermicompost, resulted in 17.17, 12.34 and 5.18% increase in cocoon yield over control, during I, II and III crop period, respectively. Larval weight was also more in case of treatment as compared to control, an indication of better leaf quality in treated plants. Single cocoon weight and single shell weight increased in case of cocoons harvested from vermicompost treated plants. In case of treatment SR% increased by 2.155% over control. Based on results of present study and it is recommended that vermicompost may be supplied to Tasar food plants in order to obtain good quality leaves and better produce.

Prakash P.J.,Regional Tasar Research Station | Singh R.S.J.,Regional Tasar Research Station | Rao B.V.S.,Regional Tasar Research Station | Kumar M.V.,Regional Tasar Research Station | Prakash N.B.V.,Central Tasar Research and Training Institute
Indian Journal of Sericulture | Year: 2010

Among the disease causing agents, cytoplasmic polyhedrosis virus (CPV) of tasar silkworm prevailed in varying degrees and inflicted considerable damage to cocoon production in 6 districts of Andhra Pradesh of India. Monitoring studies recorded that the CPV prevalence is in ascending order from second (24.20%) to first (28.46%) and third (38.67%) crop rearings during autumn, rainy and winter seasons, respectively. Maximum potential yield reduction (MPYR) was registered in the range of 335.92 to 582.74 cocoons per 100 dfls which is inversely proportional to the disease incidence. Pathogenicity at certain levels of economic threshold is required to be contained by way of preventive measures rather than curatives in silk industry. Usage of bleaching powder and leaf surface microbes proved as the best prophylactic measures with the lowest record of disease incidence of 13.30% and 9.68%, respectively. Overcrowded larval population (>41 and above) had maximized the prevalence in the range of 9.37-57.44%.

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