Tasar silkworm

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  • An experiment was carried out during the year of 2016 in the first crop rearing of Tasar silkworm at Pilot Project Centre (PPC), Kathikund with replicated thrice in completely randomized block design. The treatments consists with three brushing date of tasar larva in the month of July (i.e., 16th, 21st and 26th at an interval of 5 days) and four directions (i.e., North, South, East and West).

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  • An experiment was carried out to study the impact of Terminalia arjuna (Roxb.) leaf litter and hosted tasar silkworm excreta on quality of paddy and soil porosities cv. GNR 4 and laid out in nine treatments with Completely Randomized Design. The study revealed that the protein content of grain and nitrogen content of grain, straw recorded statistically higher with the application of 50% RDN through inorganic fertilizer + 50% RDN from arjuna hosted tasar silkworm excreta.

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  • Heat shock proteins (HSPs) usually act as molecular chaperones to prevent proteins from being denatured in response to high temperature and other extreme conditions. These are highly conserved from prokaryotes to eukaryotes. In this study, we analysed the differential expression pattern of hsp21 and hsp70 transcript during thermal stress in tropical tasar silkworm. We found expression of hsp21 and hsp70 were upregulated ~2.5 and 4 folds respectively in the temperature treated larvae in comparison to the control larvae.

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  • A comparative experiment study was carried out with chawki and direct brushing tasar silkworm on the tasar silkworm’s host plant Arjun leaves. The chawki method was carried out during I and II instars larva followed succeeding instars brushed in common plot whereas, direct brushing method was reared entire life cycles in common block plantation plots. The results indicated duration of silkworm larva was observed four days earlier with reared in chawki method than direct brushing method. Mortality rate of silkworm was found minimum under Chawki method.

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  • The study was conducted during the years 2016 in the first crop rearing season of the Tasar silkworm Antherae amylitta Dat Pilot Project Centre (PPC), Kathikund, Dumaka, Jharkhand located at 24°21′32″N 87°25′11″E,to study the “Impact of brushing date and direction on pest severity and cocoon production of tasar silkworm’.

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  • Tasar silkworm (Antheraea mylitta Drury) rearing and cocoon production are mainlycarried out by Tribal people of Central India and some parts of Odisha and Telangana states. Lack of Tasar silkworm seed production and preservationtechnology is creating difficulties in timely supply of adequate quantity of seed to the farmers and others stake holders..High temperature above 28ºC and less relative humidity than 50% are not suitable for the oviposition and hatching of eggs. In Tasar silk moth, egg retention was also more even after 72 h of oviposition in natural conditions.

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  • Azotobacter is an aerobic, free living bacteria fixes atmospheric nitrogen in soil besides producing plant growth promoting substance. Eight Azotobacter isolates were isolated and purified from different tasar rearing regions of West Singhbhoom, Jharkhand on Jenson media by using serial dilution technique. Molecular diversity among these isolates was analysed using RAPD primers.

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  • The present system of grading of Tasar Cocoons is determined by the shell weight of the cocoon. Since the shell weight of the cocoon cannot be obtained without cutting the cocoon and removing the pupae rendering the cocoon unreelable is unrealistic and difficult for larger lots of cocoon. In this paper a study has been done to predict the shell weight of the cocoons of Tasar silkworm (Antheraea mylitta Drury) through LASSO Regression based on the other cocoon dimensions, that can provide an alternative option for sorting of the cocoons based on shell weight.

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  • The Terminalia arjuna is an important deciduous tree species in India and is being utilized for both medicinal as well as sericulture purposes. The monoculture nature and continuous use of plantation for rearing of silkworm has profound negative effect on plants vigor, which attract variety of insect pests. Among them, the borer is very important pests on T. arjuna, due to their persistence attacking behavior, mainly on weak and young plants. Among the borer complex, Sphenoptera cupriventris Kerr.

    pdf8p chauchaungayxua1 04-12-2019 2 0   Download

  • The Terminalia arjuna (Roxb.) Wight & Arn. (Combretaceae) is an important commercial crop in India. It has been utilized as a primary food for rearing of the tropical tasar silkworm, Antheraea mylitta by the rural and tribal people in India as a livelihood practice. Due to its continuous utilization for rearing of silkworm, majority of the T. arjuna block plantations have been showing sickness and susceptible for variety of pests and diseases.

    pdf8p kethamoi2 14-12-2019 2 0   Download



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