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Technologies Developed by TNAU Sericulture Department
Integrated Management of Mulbery Leaf Webber
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An IPM package for the pest has developed at the Department of Sericulture, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore.
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Flood irrigation is done on the day of pruning of mulberry plants to expose the pupae to the natural enemies.
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On the next day, the pupal parasitoid, Tetrastichus howardii is released at 20,000 per acre.
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The egg parasitoid, Trichogramma chilonis is released at 2 cc per acre on 10 days after pruning.
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On 30th day after pruning, spraying of dichlorvos is done at 1 ml per litre. The spray fluid required is 200 litres per acre.
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Forty days after pruning the affected shoots are clipped and burnt.
Botanical based Silkworm Uzifly Ovipositional Deterrent:
Seed extract of the medicinal herb psoralea (petroleum extract) @ 1000 ppm (1ml/1 litre water) acts as ovipositional deterrent for the silkworm uzifly.
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Increased the larval, cocoon and shell weight and shell ratio
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Psoralea treatment reduced larval mortality by 64%
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Uzifly pierced cocoon reduced by 55% and cocoon yield level increased by 24%
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Five ml of botanical formulation dissolved in 5 litres of water for sparying – 100 dfls of silkworm larvae
Benefits
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Botanical based ovipositional deterrent
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Safer to silkworm
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Posses Juvanile Harmone, activity helps in increasing cocoon productivity and economic parameters
Sakthi Seridust
Mulberry silkworm, Bombyx mori L. is affected by number of diseases such as bacteria, virus, fungi and protozoa. The loss due to these diseases in Tamil Nadu is estimated to vary between 30-40 % in different seasons. In tropical countries, bed disinfectants are used to prevent secondary contamination of the diseases in the rearing bed. Bed disinfectants like Vijetha, Resham Jyoti, Sanjeevini are used by farmers.
With a view to determine an alternate and cost effective bed disinfectant, three bed disinfectants were formulated by Department of Sericulture, TNAU and their efficacy was tested at TNAU, Central Sericultural Research and Training Institute, Mysore and at farmers holdings. TNAU 01 formulation (Sakthi Seri Dust was found promising as broad spectrum disinfectant.
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After first, second, third, fourth moult and on fourth day of fifth instar.
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Dusting uniformly on silkworm larvae after every moult. Feeding is provided 30 minutes after application of bed disinfectant.
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Rs 40/ kg. (Five rupees lesser than the existing bed disinfectant)
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Further detail contact to
PROFESSOR AND HEAD
DEPARTMENT OF SERICULTURE
TAMIL NADU AGRICULTURAL UNIVERSITY
COIMBATORE – 641 003
TAMIL NADU, INDIA
Phone: Office: +91- 422 - 6611296
http://www.tnau.ac.in/cpps/seri/index.html
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