Breeding Perspective for Silk Yield and Quality in Indian Tropical Tasar Silkworm, Antheraea mylitta Drury (Lepidoptera: Saturniidae)

Reddy, R. Manohar; Sinha, Manoj Kumar; Prasad, B. C.

doi:10.3923/jas.2010.1902.1909

Cited by 14 publications

(9 citation statements)

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“…2000 , Nagaraju 2002 , Nagaraju and Goldsmith 2002 ) and other silkworm species ( Reddy et al. 2010a , b ). On the other hand, in three strains (31, 103, and 107), the average values of cocoon shell percentage were significantly higher during the autumn rearing in the nonselected than in the selected groups ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Phenotypic Value Changes in Pure Lines of Bombyx mori (Lepidoptera: Bombycidae) During Consecutive Generations Following Initial Selection on Cocoon Weight

Seidavi

Goldsmith

2014

Journal of Insect Science

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The experiments reported here were conducted to investigate the effect of selection on three quantitative traits, namely cocoon weight, cocoon shell weight, and cocoon shell percentage, during four generations by rearing six pure breeds of domesticated silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) of Chinese and Japanese origin compared with random unselected groups as controls. All stages of rearing and data recording were performed over four rearing periods, with generations 1–3 during successive spring seasons and generation 4 during the autumn season in year 3. Each pure line contained two groups of selected and random (control) groups. Comparisons included the effect of selection methods, pure line, and generation on the phenotypic values. We found strong main effects of pure line, generation, sex, and group and support for nearly all interactions between these main effects for all three response traits. The results indicated that cocoon weight and cocoon shell weight in the selected group were higher than in the control or nonselected group. Both selected and nonselected groups had the lowest cocoon weight, cocoon shell weight, and cocoon shell percentage in the fourth generation when environmental conditions during the autumn season were less favorable than spring. The cocoon weight and cocoon shell weight averages were higher for nonselected groups in the second and third generations, and for the selected group in the first generation due to the direct effect of selection.

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Section: Resultsmentioning

confidence: 99%

Comparison of Phenotypic Value Changes in Pure Lines of Bombyx mori (Lepidoptera: Bombycidae) During Consecutive Generations Following Initial Selection on Cocoon Weight

Seidavi

Goldsmith

2014

Journal of Insect Science

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“…The vertebrate pests also feed silkworm larvae, pupae and moths during rearing and grainage period. Birds are serious predators on tasar silkworm and cause damage up to 10-25% (Reddy et al, 2020). Major vertebrate pests like 1) predatory birds -Owl, Bubo nepalensis (Strigidae: Strigiformes), House sparrow, Passer domesticus (Ploceidae: Passeriformes), Jungle crow, Corvus splendens (Corvidae: Passeriformes), Bulbul, Phycnonotus jocosus (Pycnonotidae: Passeriformes), Indian myna, Acridotheres tristis (Stumdae: Passeriformes) and Wagtail, Motacilla alba (Motacillidae: Passeriformes), 2) Reptiles -snake, Ptyas mucosa (Colubridae: Squamata) and Garden lizard, Calotes versicolor (Agamidae: Squamata) and 3) Mammalia -Rat, Rattus rattus (Muridae: Rodentia: Mammalia), Squirrel, Funambulus palmarum (Sciuridae: Rodentia) and Monkey, Macaqa mulatta (Ceropitheadae: Primate) are very problematic on larvae and cocoon under field conditions and incur severe loss to farmers (Jadhav et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Spatial Variation in Cocoon Yield in Tropical Tasar Silkworm: An Influence of Insect-Predators and Pathogens

Chandrashekharaiah¹,

Gv²,

Ms³

et al. 2022

PLANT ARCHIVES

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Tropical tasar silkworm is a polyphagous silk spinning insect, endemic to India. The silkworms are commercially reared on field-raised host plants, which are geographically contiguous with the wild silkworm fauna. Ecologically, the silkworm is r-selected and evolved with complex survival strategies. Naturally, the population regulated by the interactions between host and natural enemies and their dynamics due to tri -trophic interactions. Hence, understanding the effect of biotic and abiotic factors on silkworm is most critical for increasing the productivity of the cocoons. The cocoon yield trends at different locations are an indication for local specific problems and requirements for specific technological interventions. Cocoon yield obtained at different locations during 2015 to 2017 was analysed for variation in cocoon yield. Further, predator dynamics and incidence of silkworm diseases were also measured to know their impact on silkworms. The results revealed that the highest cocoon yield was recorded in Chhattisgarh (59.97) and West Bengal (54.57) and lowest was in Maharashtra (34.92) and Madhya Pradesh (37.80). Average cocoon yield in Jharkhand and Odisha was 40.18 and 43.30, respectively. Based on the tukeys HSD test, the highest cocoon yield per dfl was recorded at Bilaspur and Pali. The next highest was recorded in Sundergarh, Boirdadar, Patelnaga and Bastar. The significant changes in the predator's population were recorded before and after brushing of the silkworm. Highest incidence was recorded during 1 st , 2 nd and 3 rd instar silkworm and reduced in the subsequent stages. Correlation studies indicated that there was a strong positive linear relationship between silkworm mortality and predator population. Similarly, the silkworm mortality due to disease-causing pathogens was 53.70 %, 26.75 % and 10.90 % during the first crop and 29.27%, 12.10 % and 9.70 % during the second crop in Jharkhand, Madhya Pradesh and Chhattisgarh, respectively. The study showed that the spatial variation in cocoon yield wasinfluenced by the sporadic occurrence of insect-predators and disease-causing organisms at critical stages of rearing.

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“…A significant and positive impact of training programs on the improvement of cocoon yield/100dfls of tasar silkworm was noticed post training. Reddy et al (2010) in their study found that cocoon yield & seed quality of A. mylitha is dependent on variety and nutritional status of host plant. With the intensive training, knowledge and adoption of the improved tasar host plant technologies could increase which in turn result in the improvement of the cocoon yield per 100 dfls.…”

Section: Impact Of Training On the Adoption Of Improved Tasar Silkwor...mentioning

confidence: 97%

Impact of Training on Knowledge, Adoption and Rearing Performance of Tribal Tasar Silkworm (Antheraea MYLITTA.D) Rearers of Maharashtra

Gedam¹,

Madan²,

Satyanarayana³

2022

PLANT ARCHIVES

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Maharashtra is a traditional state of tasar silk production. The productivity of the state shows that the cocoons yield is hovering around 25-30 cocoons per dfls which might be due to lack of skills and training about the recommended package of practices. Thus, the investigation of impact of training on knowledge, adoption and rearing performance was undertaken with a random sample of 120 tasar silkworm rearers of Maharashtra. The study found that there was a significant impact on knowledge gain and adoption level (p<0.05) post training with the average difference of 34.30 per cent and 27.40 per cent, respectively. As far as the rearing performance was concerned, the hatching percentage and effective rate of rearing showed an improvement of 17.32 per cent and 36.66 per cent, respectively; whereas cocoon yield was improved by 1179 cocoons per 100 dfls. Similarly the annual income of tasar silkworm rearers was improved by Rs.2358/-per 100 dfls. The 't' test of significance showed that there was significant improvement in the hatching percentage, effective rate of rearing, cocoon yield per 100 dfls and annual income per 100 dfls (p<0.05) post training. Thus, study recommend that the frequent training programs about the improved tasar rearing technologies should be organized to achieve the human resource development objective of the state which in turn will help in expanding the Tasar silk industry in state of Maharashtra and in India as a whole.

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Breeding Perspective for Silk Yield and Quality in Indian Tropical Tasar Silkworm, Antheraea mylitta Drury (Lepidoptera: Saturniidae)

Cited by 14 publications

References 0 publications

Comparison of Phenotypic Value Changes in Pure Lines of Bombyx mori (Lepidoptera: Bombycidae) During Consecutive Generations Following Initial Selection on Cocoon Weight

Comparison of Phenotypic Value Changes in Pure Lines of Bombyx mori (Lepidoptera: Bombycidae) During Consecutive Generations Following Initial Selection on Cocoon Weight

Spatial Variation in Cocoon Yield in Tropical Tasar Silkworm: An Influence of Insect-Predators and Pathogens

Impact of Training on Knowledge, Adoption and Rearing Performance of Tribal Tasar Silkworm (Antheraea MYLITTA.D) Rearers of Maharashtra

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