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Gogoi R.,Arunachal Pradesh Regional Center | Hakkinen M.,University of Helsinki
Nordic Journal of Botany | Year: 2013

Musa puspanjaliae R. Gogoi & Häkkinen, a new species of Musa sect. Musa, is described and illustrated from west Kameng, Arunachal Pradesh, India based on morphological characteristics observed in the field. The new species is common in Sessa, Zero Point to Ramda on Sepa road of west Kameng and Hazi Basti, Ziro of lower Subansiri district in Arunachal Pradesh. A key to M. puspanjaliae and related taxa is provided. © 2013 The Authors.


Sinha B.,Arunachal Pradesh Regional Center
Proceedings of the Indian National Science Academy | Year: 2014

Of late, interest in alternative eco-friendly rodent control methods have paced up owing to the known shortcomings of rodenticides, particularly anticoagulants. The present study reports 15 such non-chemical rodent control methods practiced in the upland areas of Northeast India. Most of these (80%) methods include indirect means of rodent control i.e. use of repellents, by attracting predators and by trapping. About 50% of the methods have been non-experimentally validated to be highly effective. The striking feature of these methods appears to be the probable minimal effect on non-target organisms, which is the main constraint with chemical rodenticides. However, thorough investigation of these methods involving extensive field trials is critical and may provide valuable clues for developing some highly effective alternatives to chemical rodenticides.


Bhaumik M.,Arunachal Pradesh Regional Center
Edinburgh Journal of Botany | Year: 2012

Neottia dihangensis M.Bhaumik and N. confusa M.Bhaumik (Orchidaceae) from Arunachal Pradesh, India are described and illustrated. ©2012 Copyright Trustees of the Royal Botanic Garden Edinburgh.


Sinha B.,Arunachal Pradesh Regional Center
Pestology | Year: 2012

Efficacy of the aqueous crude extracts of Eupatorium adenophorum Spreng (Asteraceae) leaves was tested against the mustard aphid, Lipaphis erysimi Kalt (Homoptera: Aphididae) at concentrations of 1,2 and 4% (v/v) in both laboratory and field conditions. In both the conditions, higher concentration of the crude extract caused significantly (P<0.05) higher mortality. LC50 for the aqueous extract decreased significantly (P<0.05) over time in both the environmental conditions suggesting cumulative effect of the extract. Significant differences in the mortality of aphids between the laboratory and field experiment was observed for any given concentration in any particular time. The potential use of the plant as an alternative pesticide particularly against soft bodied and sap-sucking insects like aphids is discussed with the help of the present state of knowledge. Though the plant appears to possess insecticidal properties, detail investigations are necessary particularly regarding its reported toxicity to non-target organisms like rats, mice and horses.


Bhaumik M.,Arunachal Pradesh Regional Center
Kew Bulletin | Year: 2014

Chrysosplenium arunachalense Bhaumik from Arunachal Pradesh, India is described and illustrated. This species forms a small colony as the flowering stem bears new plantlets at the axils of cauline leaves and the colony spreads gradually. It differs from other species of subgen. Gamosplenium Maxim. emend. J. T. Pan in plants glabrous throughout, leaf blade oblong to elliptic-oblong with cordate base and the cauline leaf axil bears new plantlets. The type locality is covered with snow for 3-5 months each year. © 2014 The Board of Trustees of the Royal Botanic Gardens, Kew.

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