Inbreeding depression of heterosis in muga silkworm, Antheraea assama

Thangavelu, K.; Bhagowati, A. K.; Chakraborty, Avishek

doi:10.1017/s1742758400011784

Cited by 4 publications

(5 citation statements)

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“…Higher proportion of non-emerged cocoons, emergence of crippled moths and adverse effects on ovulation and oviposition is mainly attributed to high temperature experienced during spinning (Lalitha et al, 2020;Das et al, 2021). Among all the silkworms, eri silkworm is hardy and comparatively more tolerant to temperature and humidity fluctuations (Thangavelu et al, 1986;Prasad and Saha, 1992). However, due to global warming, the summer months are gradually extending for more period in Lower Assam and also becoming critical with prolonged high temperature, which is found detrimental to the development of eri silkworms.…”

Section: Resultsmentioning

confidence: 99%

Phenology of Eri silkworm Samia ricini (Donovan) in Lower Assam and its impact on upscaling eri seed production

Lalitha¹,

Hemachandran²,

Borpuzari³

2023

JEB

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Aim: A phenology study on the seed cocoon rearing performance of Samia ricini (Donovan) in different seasons of Lower Assam and subsequent production of disease-free laying was undertaken. Methodology: In each season, four batches of seed cocoon rearing were conducted on eri silkworms of Borduar race (n=100 dfls) which were reared only on the castor, the primary host plant, to eliminate the variability due to different host plants. The data on different seed cocoon rearing and reproductive parameters were recorded for every rearing and pooled season-wise for comparison. Results: The highest seed cocoon yield per dfl was recorded during autumn (215.92±6.24 nos) followed by winter/spring and late monsoon seasons. During autumn, significantly higher ERR% (90.69±1.01) was observed. Grainage operations conducted on the seed cocoons of various seasons revealed ideal dfl to cocoon ratio during autumn (1:3.5) and late monsoon (1:4.2). The percentage of moth emergence was significantly high in autumn (92.27± 2.90), followed by late monsoon (89.07± 5.38). Interpretation: Results evidently indicated that late monsoon and autumn seasons spanning from September to November months can be utilized effectively for large scale eri silkworm seed production in Assam. Key words: Eri silkworm, Phenology, Reproductive performance, Samia ricini, Seed cocoon rearing

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Section: Resultsmentioning

confidence: 99%

Phenology of Eri silkworm Samia ricini (Donovan) in Lower Assam and its impact on upscaling eri seed production

Lalitha¹,

Hemachandran²,

Borpuzari³

2023

JEB

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“…There are reports that Muga silkworm is attacked by different insect pests from different parts of the country and other countries as well (Chaudhury, 1981;Thangavelu et al, 1988;Singh & Das, 1996). E. furcellata is reported from Southeast Asia, Japan, India, and Taiwan, and has been preying on Lepidopteran, Coleopteran and Heteropteran insects (Ahmad, 1996;Chu, 1975;Chang, 2002;Jakhmola, 1983;Prasad et al, 1983).…”

Section: Resultsmentioning

confidence: 99%

Seasonal Occurrence, Biology and Feeding Behaviour of Eocanthecona Furcellata Wolf Predating Muga Silkworm Antheraea Assamensis Helfer in Brahmaputra Valley of Assam, India

Singh¹,

Dinata²,

Kumar³

et al. 2022

PLANT ARCHIVES

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India produces all four types of commercially exploited silk viz., Mulberry, Eri, Tasar and Muga. Among these Tasar, Eri and Muga are non-mulberry silks and collectively known as Wild or Vanya Silks. Except Eri silkworm, Muga and Tasar are reared in open environment on its host plants. Muga is endemic to Assam and now its rearing practice is expanded to other states of North East India. Muga silkworm, Antheraea assamensis (Helfer) is polyphagus, multivoltine in nature. Their important food plants are Som (Persea bombycina) and Soalu (Litsea monopetala), which produces highly lustre golden silk of India. Most of the food plants of Muga silkworm are perennial tree and they are abundantly available in North Eastern region of India. As Muga silkworm is reared in open environment, challenging during rearing practices is due to various attacks from different insect predators. Among different insect predators of Muga silkworm, the most economical important predator is stink bug, Eocanthecona furcellata Wolf which cause extensive damage of crop during summer season. E. furcellata is commonly known as stink bug. The loss due to E. furcellata is alarmingly high in the preseed (Aherua and Jarua) and seed crops (Chotua and Bhodia) as compared to the commercial crops (Jethua and Kotia). The population dynamic of the predator has positive correlation with abiotic factors; their feeding behaviour is very tactical and skilful. Application of suitable Integrated Pest Management (IPM) is very crucial to manage the crop damage caused by E. furcellata.

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“…Fresh quality muga seed cocoons harvested from two important seed crops viz., 'Jarua' (Dec-Feb) and 'Bhodia' (August-Sept) were collected from the private muga seed growers of North lakhimpur and Dhemaji district of Assam to conduct the investigation and to produce seed for two rearing seasons viz., spring (March-April) and autumn (Nov-Dec). Collected seed cocoons of muga silkworm were preserved in well ventilated wire mesh cocoon storage cages at normal room temperature till the moth emergence (Plate 1) following the method of Thangavelu et al (1986). The freshly emerged male and female moths (Plate 2) were allowed to couple naturally in the cocoon preservation cages.…”

Section: Methodsmentioning

confidence: 99%

“…The biotic and abiotic factors of the environment during different seasons highly influence the life cycle features of the Antheraea mylitta DOI No. : http://doi.org/10.53550/EEC.2023.v29i01.045 in the form of cocoon weight, larval weight, pupal weight, shell percent, shell weight, percent emergence, percent coupling, percent hatching, adult longevity, fecundity, and reelability of the silk (Jolly et al, 1974;Thangavelu and Sahu, 1986;Nayak and Dash, 1974;Chaoba Singh et al, 1991;Yadav et al, 1992;Nayak et al, 1993;Zhu et al, 2000;Chen et al, 2002;Seema et al, 2004). The change of climatic factors especially relative humidity and temperature is known to affect all the stages of a silkworm's lifecycle including their development and survival.…”

Section: Introductionmentioning

confidence: 99%

Effect of Season on Reproductive Parameters of Muga Silkworm (Antheraea assamensis Helfer)

Saikia¹,

Dutta²,

Saikia³

et al. 2023

EEC

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The study was undertaken at the Department of Sericulture, Assam Agricultural University, Jorhat (Assam) to find out the impact of season on reproductive parameters of muga silkworm, Antheraea assamensis Helfer in autumn and spring season. The study revealed that though the fecundity was registered better in autumn; hatching percentage of egg (seed) of the muga silk moth performed better in spring season. Although season had significant effect on weight of eggs but non significant effect was observed on oviposition period and hatching period of muga silk moth eggs.

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Inbreeding depression of heterosis in muga silkworm, Antheraea assama

Cited by 4 publications

References 1 publication

Phenology of Eri silkworm Samia ricini (Donovan) in Lower Assam and its impact on upscaling eri seed production

Phenology of Eri silkworm Samia ricini (Donovan) in Lower Assam and its impact on upscaling eri seed production

Seasonal Occurrence, Biology and Feeding Behaviour of Eocanthecona Furcellata Wolf Predating Muga Silkworm Antheraea Assamensis Helfer in Brahmaputra Valley of Assam, India

Effect of Season on Reproductive Parameters of Muga Silkworm (Antheraea assamensis Helfer)

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