Jeyasankar Alagarmalai

Government Arts College, Coimbatore · PG & Research Department of Zoology

Objective: To determine the phytochemical, larvicidal and pupicidal activity of Argyreia pomacea choisy leaf extracts against fourth instar larvae and newly emerged pupae of Ae. aegypti. Analysis t Methods: o determine the phytochemical composition of chloroform and aqueous leaf extract was performed. At concentrations of 0.625%, 1.25%, 2.5% and 5%...

As the world undergone unpreceded time of tragedy with the corona virus, many researchers have raised to showcase their scientific contributions in terms of novel configured anti-viral drugs until now. Herein, we designed pyrimidine based nucleotides and assessed for the binding capability with SARS-CoV-2 viral replication targets of nsp12 RNA-depe...

Infections caused by multi-drug-resistant (MDR) bacteria are a global threat to human health. As venoms are the source of biochemically diverse bioactive proteins and peptides, we investigated the antimicrobial activity and murine skin infection model-based wound healing efficacy of a 13 kDa protein. The active component PaTx-II was isolated from t...

Background and Objective: Cotton is a greatly valued commercial crop which finds heavy losses due to pests. The study aimed to assess the bio-pesticidal activity of Hypericum hookerianum (Wight and Arn.) against important field pest Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae). Materials and Methods: The present study, the methanol extrac...

Solanum pseudocapsicum L. A Potential Pesticide Against Helicoverpa armigera (Hub.) and Spodoptera litura (Fab.) (Lepidoptera: Noctuidae) T. Chinnamani, Alagarmalai Jeyasankar and Kuppusamy Elumalai Abstract: Background and Objective: Nowadays, chemical pesticides applied to control the field pests have deleterious effects on the ecosystem. Hence,...

Objective: The present study phytochemical screening and mosquitocidal activity of three different medicinal plants, Sesamumindicum, Pungamiapinnata, and Crotonbonplandionumextracts. The methanol extract of leaf samples were used for the phytochemical analysis to find out the phytochemical constituents in the plants. The main objective of the resea...

The aim of this research works was to determine the chemical composition and insect growth inhibitory activity of ethyl acetate crude extract of Solanum pseudocapsicum fruits against the Spodoptera litura and Helicoverpa armigera. Ethyl acetate extracts of S. pseudocapsicum fruits were fractionated using Silica-gel Coloum Chromatography and analyse...

To determine phytochemistry, ovicidal and repellent activity of Sesamum indicum extracts against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. Phytochemistry properties of flavonoids, tannins, terpenoids, triterpenoids, anthraquinones, protein, phenol and phytosteroids present in the methanol extract of S. indicum. The ovicidal act...

One of the major challenges that mankind confronts is providing adequate food to the rapidly growing population of the world, which is calculated to reach an estimate of 8 billions of people in the year 2020. In order to rationalize this, it is mandatory to increase food production through crop protection, which mainly depends on plants. These are...

The four Steinernema sp. isolated from Palladam, Erode, karur and Madathukulam areas were tested for its pathogenicity against 4th instar larvae of Spodoptera litura with 100 IJs/ 20 larvae under laboratory conditions. The mortality was observed after 24 hrs of infection with 87%, 88%, 86% and 83% respectively in Palladam, Erode, karur and Madathuk...

Safety and environmentalcal insecticide issues surrounding the use of chemical insecticides has led to an emphasis on developing alternative control measures such as entomopathogens and their products. Entomopathogenic nematodeare effective biopesticide which can be incorporated in IPM programs because they are considered non-toxic to humans, relat...

The present study was conducted to determine the larvicidal activity of Scutellaria violacea leaf extracts against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. The larvicidal activity was determined against three vector mosquito species at the concentrations of 50, 100, 150, 200 and 250 ppm. Larval mortality was assessed after 24...

The present study was conducted to determine the larvicidal activity of Scutellaria violacea leaf extracts against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. The larvicidal activity was determined against three vector mosquito species at the concentrations of 50, 100, 150, 200 and 250 ppm. Larval mortality was assessed after 24...

The present study was conducted to determine the larvicidal activity of Scutellaria violacea leaf extracts against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. The larvicidal activity was determined against three vector mosquito species at the concentrations of 50, 100, 150, 200 and 250 ppm. Larval mortality was assessed after 24...

Antifeedant, larvicidal and ovicidal activities of fractions isolated from ethyl acetate crude extracts of Barleriabuxifolia leaves were tested against fourth instar larvae of Spodopteralitura and Helicoverpaarmigera. The maximum antifeedant, ovicidal and larvicidal activity was recorded in fraction III of B. buxifolia against S. litura and H. armi...

A r t i c l e I n f o Phytochemical represents a rich resource for the discovery of novel pesticides that are effective, cheap and environmentally safe. The main target mosquito vectors, Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus cause serious human diseases. The petroleum ether, chloroform and ethyl acetate extracts of Murraya p...

To determine the larvicidal and pupicidal activity of Pouzolzia bennettiana var. acuta leaf extracts against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. The larvicidal activity was determined against three vector mosquito species at concentrations of 50, 100, 150, 200 and 250 ppm. Larval and pupal mortality was assessed after 24...

In the present investigation the larvicidal activity of Silver nanoparticle synthezed by the leaf extracts of Azadirachta indica against Culex quinquefasciatus was attempted in the laboratory conditions. The result of the present study indicated that the larval mortality of C. quinquefasciatus was high in 0.05% (500 ppm) and the lowest mortality wa...

Objective: The present study was investigated important medicinal plant extract Terminalia arjuna and Trachyspermum roxburghianum against the fourth instars larvae of groundnut pest Helicoverpa armigera. Methods: The extracts were used as methanol, ethyl acetate, chloroform, and hexane and are used as the different concentration of 25, 75, 125, 175...

Abstract: To determine the antifeedant and larvicidal activity of Pongamia pinnata chemical compositions were assayed for their toxicity test against polyphagous field pest, Spodoptera litura. Chemical constituents of twenty compounds were identified in the P. pinnata compounds representing to 99.96%. Phytol, 1,2-Benzenedicarboxylic acid, diisoocty...

To determine the repellent and larvicidal activities of five essential plant oils such as citriodora oil (Corymbia citriodora var. C), citronella oil (Cymbopogon nardus var. L), clove oil (Syzygium aromaticum L.), Gaultheria oil (Gaultheria procumbens L) and lemongras oil (Cymbopogon citratus) against Tribolium castaneum. Repellent and larvicidal a...

This study to investigate the crude extracts effect of Barleria longiflora against fourth instar larvae of Spodoptera litura and Helicoverpa armigera. Antifeedant, larvicidal, and the inhibitory activities of B. longiflora were observed with different solvent extracts of petroleum ether, chloroform and ethyl acetate. Significant effect has been obs...

In the present study the Larvicidal activity of Silver nanoparticle synthezed by the leaf extracts of Adhatoda vasica against Culex quinquefasciatus was carried out in the laboratory conditions. The result of the present study indicated that the LC 50 values of the methanolic leaf extract of A. vasica along with silver nanoparticle was 450.03 ppm a...

In the present study the Larvicidal activity of Silver nanoparticle synthezed by the leaf extracts of Adhatoda vasica against Culex quinquefasciatus was carried out in the laboratory conditions. The result of the present study indicated that the LC50 values of the methanolic leaf extract of A. vasica along with silver nanoparticle was 450.03 ppm ag...

Plant–herbivore interactions are controlled by a variety of defense mechanisms in the plant and counter-adaptation mechanisms in the herbivore. The broad mite (BM), Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae), is an important pest of vegetables and flowers worldwide. It produces persistent physiological changes that result in organ defo...

To determine the larvicidal activity of Andrographis paniculata leaf extracts against Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus. The larvicidal activity was determined against three vector mosquito species at concentrations of 50, 100, 150, 200 and 250 ppm and mortality was assessed after 24 hours. The leaf extracts of A. panicu...

To evaluate the growth and feeding inhibitory activities leaves extract of Tragia involucrata tested against third instar larvae of Achaea janata and Pericallia ricini. Feeding inhibition, larvicidal and growth inhibitory activities were tested with different solvent extracts of hexane, chloroform and ethyl acetate. Chloroform extracts showed pr...

Objective: To determine the phytochemical analysis and larvicidal activity of Trgia involucrata leaf extracts against fourth instar larvae of Aedes aegypti. Methods: Phytochemical analysis of hexane leaf extract and larvicidal activity was determined against two vector mosquito species at concentrations of 50, 100, 150, 200 and 250 ppm. Larval mor...

Objective: To evaluate the antifeedant, larvicidal and insect growth inhibitory activities extracts of Pseudocalymma alliaceum tested against fourth instar larvae of Spodoptera loitfu craru (dSe. litura) and Helicoverpa armigera (H. armigera). Methods: Hexane, chloroform and ethyl acetate extracts were prepared and tested for antifeedant, insectici...

ARTICLE INFO ABSTRACT The present study was conducted to evaluate the effect of vermiwash on growth and productivity of brinjal plants. Physico-chemical properties of the soil in both control and experimental plots were studied and interrupted with results. The results revealed that vermiwash spray enhanced the growth parameters (plant height and n...

et al. Larvicidal activity of biologically synthesised silver nanoparticles against dengue vector Aedes Aegypti (Culicidae), Discovery, 2014, 9(23), 65-68, www.discovery.org.in activity of biologically synthesised silver nanoparticles against dengue vector Aedes Aegypti (Culicidae). Discovery, 2014, 9(23), 65-68 ABSTRACT Silver nanoaparticles have...

Silver nanoaparticles have important applications in the field of biology. Stable silver nanoparticles were synthesized by biological reduction method. The objective of the present investigation was designed to determine the larvicidal activity of silver nanoparticles synthesized from aqueous leaf extract of Cleistanthus collinus against the larvae...

Six different indigenous plants were screened for antifeedant and insecticidal activity against fourth instar larvae of Epilachna beetle, Henose-pilachna vigintioctopunctata, which is a severe pest on brinjal. Among the plants screened, Achyranthes aspera showed higher activity against the selected pest. Ethyl acetate extracts of A. aspera showed h...

Six different indigenous plants were screened for antifeedant and insecticidal activity against fourth instar larvae of Epilachna beetle, Henose-pilachna vigintioctopunctata, which is a severe pest on brinjal. Among the plants screened, Achyranthes aspera showed higher activity against the selected pest. Ethyl acetate extracts of A. aspera showed h...

To investigate the antifeedant activity of crude extracts of Barleria buxifolia tested against fourth instar larvae of Spodoptera litura and Helicoverpa armigera. Antifeedant activity of hexane, chloroform and ethyl acetate extracts were prepared and tested against fourth instar larvae of selected insect pests. Ethyl acetate extracts of B. buxifoli...

To determine the larvicidal and pupicidal activites of Solanum trilobatum (S. trilobatum) leaf extracts against Aedes aegypti (Ae. aegypti), Culex quinquefasciatus (Cx. quinquefasciatus) and Anopheles stephensi (An. stephensi). The larvicidal and pupucidal was determined at five different concentrations of 50, 100, 150, 200 and 250 ppm. Percentage...

Oviposition deterrent and ovicidal activity of crude extracts, fractions and compounds A and B from the leaves of Syzigium lineare Wall., were tested against armyworm Spodoptera litura Fab. The concentration tested for crude extract was 0.625, 1.25, 2.50 and 5.0%; fractions of 0.025, 0.05, 0.075 and 0.1%; and compounds A and B of 25, 50, 75 and 100...

Mosquitoes not only create a nuisance as biting insects but are etiologic agents for some of the devastating diseases of human history such as malaria, filariasis, chikunguniya, dengue etc. Anopheles stephensi Liston is the primary vector of malaria in India and other West Asian countries, Malaria remains one of the most prevalent diseases in the t...

Evaluation of the antibacterial activity of ten selected plants tested against important pathogens. Screening of hexane, diethyl ether and ethanol extracts of ten different plants were tested in vitro by the disk diffusion method against seven bacterial strains, namely, Stephylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa , Vibrio chole...

Objective To determine the larvicidal activity of Phyllanthus emblica leaf extracts against Aedes aegypti and Culex quinquefasciatus.Methods The larvicidal activity was determined against two vector mosquito species at concentrations of 50, 100, 150, 200 and 250 ppm. Larval mortality was assessed after 72 hours.ResultsThe leaf extracts of P. emblic...

Objective To evaluate antifeedant, insecticidal and insect growth inhibitory activities of eucalyptus oil (Eucalyptus globules) and gaultheria oil (Gaultheria procumbens L.) against black cutworm, Agrotis ipsilon.Methods Antifeedant, insecticidal and growth inhibitory activities of eucalyptus oil and gaultheria oil were tested against black cutworm...

To evaluate the antifeedant, insecticidal and growth inhibition activities of Solanum pseudocapsicum (S. pseudocapsicum) seed extracts against Spodoptera litura (S. litura) and Helicoverpa armigera (H. armigera). Hexane, diethyl ether, dichloromethane and ethyl acetate seed extracts were prepared and tested for antifeedant, insecticidal and growth...

Quantitative and qualitative changes of haemolymph protein profile of S. litura was studied under the stress of subfractions isolated from S. lineare. The study was conducted at Entomolgy Research Institute, Loyola College, Chennai, India. Standard protcol was followed to estimate qualitative and quantitatiive changes of haemolymph protein. The est...

Bio-efficacy of hexane, dichloromethane and ethyl acetate leaves and seeds extracts of Solanum pseudocapsicum were studied against black cutworm Agrotis ipsilon to find out their antifeedant, insecticidal and growth regulations activities. Significant antifeedant, insecticidal and growth regulatory activities were noticed on ethyl acetate extracts...

A new crystal compound 2,5-diacetoxy-2-benzyl-4,4,6,6-tetramethyl-1,3-cyclohexanedione was isolated from the leaves of Syzygium lineare. The insecticidal activity of the compound was assessed against fourth instar larvae of Spodoptera litura. Its activity was better than the positive control azadirachtin. The compound was responsible for growth inh...

The Nilgiris in Indian subcontinent is one of the major Biodiversity hot spot in India and renowned for the endemism. Crucifers are the imperative cash crops cultivated in various parts of this high altitude. Insect pests diversity associated with cruciferous crops were evaluated at four different sample sites in Nilgiris district. Thirteen species...

Impact of new crystal compound 2, 5-diacetoxy-2-benzyl-4, 4, 6, 6-tetramethyl-1, 3-cyclohexanedione on feeding physiology, developmental indices and quantitative changes in haemolymph protein on the larvae of armyworm, Spodoptera litura was studied. The novel compound was isolated from the leaves of medicinal plant, Syzygium lineare. The percentage...

Antifeedant and grow th inhibitory activities of hexane, diethyl ether, dicholoromethane and ethyl acetate crude extracts of Syzygium lineare leaves were tested against fourth instar larvae of Spodoptera litura. All the crude extracts showed antifeedant activity in a dose dependent manner. Significant antifeedant activity was found only in ethyl ac...

Antifeedant and grow th inhibitory activities of hexane, diethyl ether, dicholoromethane and ethylacetate crude extracts of Syzygium lineare leaves were tested against fourth instar larvae of Spodoptera litura.All the crude extracts showed antifeedant activity in a dose dependent manner. Significant antifeedant activitywas found only in ethyl aceta...

This study examined the host-selection ability of the broad mite Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae). To make long-distance-shifts from one host plant patch to another, broad mites largely depend on phoretic association with whiteflies. However, the host plants of whiteflies and broad mites are not necessarily the same. We deter...

The Ethiopian fruit fly, Dacus ciliatus, is an oligophagous pest of cucurbit crops, particularly melons, cucumbers, and marrows (summer squash). The present study aimed to identify host attractants for D. ciliatus and was guided by a behavioral bioassay and an electrophysiological assay. We tested volatile compounds from the fruits of a host plant,...

Efficacy of Hyptis suaveolens against lepidopteran pests Hyptis suaveolens (L.) Poit, a rigid sweetly aromatic herb belonging to the family Lami-aceae is a native of tropical America. It was introduced and naturalized in India 1 . The plant is used as green manure in certain parts of the west coast. The edible shoot tips are sometimes used for flav...

Annual crop losses due to insect pests, diseases and weeds have been estimated to be about Rs. 50,000 crores in India. In the past, synthetic pesticides have reigned supreme in crop protection programmes and over 5 million tonnes of pesticides have been used the world over during this period immensely benefiting mankind. Intensification of agricult...

Studies on bioefficacy of various solvent extracts of Hyptis suaveolens and Melochia chorcorifolia in terms of their effects as, oviposition deterrent and ovicidal and insecticidal activity against the cowpea weevil, Callosobruchus maculatus indicated that it was maximum at higher concentrations irrespective of the solvents. Reduction in ovipositio...

Efficacy of ethyl acetate, methanoi and aqueous extracts of Artocorphus heterophyllus, Lantena camera, Lobellia leschenaultians. Mimosa pudica, Sebastiana chaemeale and Cleistanthus collinus were tested at 1000 ppm for their antifeedant activity against fourth instar larvae of Helicoverpa armigera using leaf disc (no-choice) method. The aqueous ext...