B. K. Gupta , S. I. Ahmed , Vijay Veer

Abstract

Twenty two conventional insecticides were tested as direct spray against adult beetles of Calopepla leayana. This is a serious pest of Gmelina arborea plantations and occurs all along the tract of its host plant. The relative effectiveness of these insecticides was in order of Formothion> Monocrotophos> Quinalphos> Chlordimeform> gamma-BHC> Malathion + Fenitrothion > Toxaphene> Malathion> Dichlorvos (Nuvan) > Pyrethrum> Klofos > Endosulfan > Bromophos-ethyl > Fenitrothion > Dieldrin> D.D.T. > Aldrin> Chlordane> Dichlorvos (DDVP)> Methyl parathion.

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B. K. Gupta , Vijay Veer

Abstract

The nineteen conventional insecticides were tested as contact poison against third instar larvae of Glyphodes pyloalis in laboratory. The descending order of toxicity of the insecticides was : chlordimeform> formotbion > quinalphos >monocrotophos> toxaphene> carbaryl> fenitrothion> malathion (premium grade) :> methyl parathion > endosulfan > malathion + fenitrotbion > leptophos :> klofos :>dichlorvos > endosulfan > DDT > dimethoate> pyretbrum>chlordane>gamma-BHC. Monocrotophos, formothion and chlordimeform are 27 to 32 times more toxic than DDT. Relative resistance to these insecticides of Glyphodes pyloalis than Selepa celtis is also discussed.

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S. C. Mishra , Vijay Veer , Avinash Chandra

Abstract

A new insect pest, Aristobia horridula Hope, of Dalbergia sissoo is recorded from West Bengal. About 80 to 90 per cent of trees of Dalbergia sissoo plantation was affected at the time of observation.

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Vijay Veer , Avinash Chandra

Abstract

Insect pests of Populus deltoides in nurseries and plantations in Assam and West Bengal recorded were two borers, Zeuzera coffeae Nietner, lndarbela quadrinotata Walk ; three species of termites, Coptotermes heimi (Wasm.), Coptotermes kishori Roonwal and Chhotani, Microtermes unicolor Snyder; a leaf miner, Phytomyza sp: two lepidoterous defoliators, pyqoera fulqurita Walk. Pyqaera diniasalis Walk. an aphid, Tuberolachnus sp. and a species of thrips, Scirtothrips dorsalis Hood.

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B. K. Gupta , Vijay Veer , P. K. Sen-Sarma

Abstract

>>Twenty-one insecticides were tested as contact poisons against the 3rd instar larvae of Selepa celtis infesting Morus alba. Monocrotophos, chlordimeform, quinalphos and anthio were more toxic than DDT, while ambithion. Dimetheate and endrin were less toxic than DDT. The rest of the 14 insecticides were in the follwing order of effectiveness : carbaryl > endosulfan > pyrethrum > gamma-BHC > dichlorvos > toxaphene > leptophos > malathion > klofos > fenitrothion > dieldrin > aldrin > eythion > DDT.

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Ashish Uniyal ¹, Sachin N. Tikar ¹, Shakti V. Shukla ², Om P. Agrawal ³, Devanathan Sukumaran ¹, Vijay Veer ⁴

Affiliations
1 Vector Management Division, Defence R and D Establishment, Gwalior-474002, IN
2 Fragrance and Flavour Development Center, G. T. Road, Makrand Nagar, Kannuaj-209726, IN
3 School of Studies in Zoology, Jiwaji University, Gwalior-474 011, IN
4 Defence Research Laboratory, Tezpur, Assam-784001, IN

Abstract

Essential oils are natural volatile substances from plants and they are used as protective measure against blood-sucking insects. The objective of the study was to determine the effective repellency of 23 essential oils at various doses against female mosquitoes Aedes aegypti under laboratory conditions using K&D module and to identify chemical constituents of the oils by Gas Chromatography/Mass Spectrometry (GC/MS). The results showed that litsea oil exhibited effective mean percentage repellency of 43%, 86%, 93% and 100% at 0.01%, 0.1%, 1.0% and 10% concentration, respectively with the median effective dose (ED₅₀ ) of 0.012 (95% CI= 0.003-0.028). At 20% concentration, litsea oil showed 83% repellency upto 2 hr and the dominant component of litsea oil was identified as Zcitral by GC/MS. The studies indicate that these oils could be used in the preparation of herbal mosquito repellents which are safe to human beings.

Keywords

Essential Oils, Repellent, K and D Module, GC/MS, Aedes aegypti.

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