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Correlation between population dynamics of mosquito larvae and their habitat qualities
Lalit Mohan RANJEETA,Preeti SHARMA,C. N. SRIVASTAVA 한국곤충학회 2008 Entomological Research Vol.38 No.4
Surveillance of anopheline and culicine larvae was conducted fortnightly to determine population composition and density at seven sites in the area of the Mathura Refinery, Mathura, India during 2005-2006. The correlation between population of the vectors and their habitat quality was established. Temperature (0.978 and 0.85°C), pH (0.99 and 0.95), conductivity (0.98 and 0.98 mho) and calcium ion hardness (0.978 and 0.85 p.p.m.) were positively correlated with the populations of both larval species. In contrast, the correlation coefficients between the parameters total hardness, magnesium ion hardness, biochemical oxygen demand and chemical oxygen demand varied with the larval species. The anopheline larval population was dominant over the culicine population in the surveillance area. The distribution of anopheline mosquito larvae during the study period was found to be constant, and the average density of anopheline and culicine larvae was 84.70 and 15.30%, respectively, across all seven sites. Thus, the study demonstrated spatial and temporal population differences of mosquito larvae with respect to environmental factors, including water quality.
Lalit MOHAN,Preeti SHARMA,C. N. SRIVASTAVA 한국곤충학회 2006 Entomological Research Vol.36 No.4
Cypermethrin and crude extracts of Solanum xanthocarpum were both observed fortheir larvicidal activity against Culex quinquefasciatus. Petroleum ether extract with lethal concentration (LC)50 and LC90 of 41.28 and 111.16 p.p.m. after 24 h and LC50 38.48 and LC90 80.83 p.p.m. after 48 h, respectively, was found to be the most effective, followed by carbon tetrachloride and methanol extracts. LC50 and LC90 for cypermethrin were 0.0027 and 0.0097 p.p.m. after 24 h and 0.0013 and 0.0092 p.p.m. after 48 h of exposure, respectively. Combined formulations were evaluated for synergistic activity and a 1:1 ratio of cypermethrin and petroleum ether extract was observed to be more effective than 1:2 and 1:4 ratios. Combinations of S. xanthocarpum extracts and cypermethrin demonstrated higher larvicidal activity, indicating synergistic activity. These results demonstrate the need for further studies on the effectiveness and toxicity to humans and animals, particularly aquatic forms.
Impact Analysis of Neem Kernel Extracts on the Developmental Profile of Anopheles stephensi
Sharma, Preeti,Mohan, Lalit,Srivastava, C.N. Korean Society of Applied Entomology 2006 Journal of Asia-Pacific Entomology Vol.9 No.1
Laboratory evaluation of the larvicidal efficacy of Ageratum conyzoides, Argemone mexicana and Azadirachta indica was carned out against Anopheles stephensi to develop an effective ecofriendly insecticide of plant origin. The methanol extract of A. indica was observed remarkably active with $LC_{50}$ values 18.2 and 13.1 ppm after 24 and 48 hours of exposure. Petroleum ether extracts of Ag. conyzoides with $LC_{50}$ 425.6 and 267.9 ppm, carbon tetra chloride extract of Ar. mexicana with $LC_{50}$ 313.2 and 240.3 ppm and petroleum ether extract of Az. indica with $LC_{50}$ 189.1 and 53. 5 ppm after 24 and 48 hours of exposure were also found effective. The impact of Az. indica methanol extract on the life cycle of malaria vector was further observed. Methanol extract of Az. indica causes deformities in different developmental stages of the malaria vector. Total developmental period was also extended from 10 to 15 It remarkably influenced hatching rates, larval-pupal transformation and development, adult emergence and growth index. Larval and pupal periods were also significantly prolonged.
Lalit Mohan,Preeti Sharma,Shrankhla,Chand Narayan SRIVASTAVA 한국곤충학회 2013 Entomological Research Vol.43 No.4
The relative toxicity of different concentrations of temephos and fenthion with petroleum ether root extract of Solanum xanthocarpum (Schrader) at 1 : 1, 1 : 2 and 1 : 4 ratios was evaluated against Anopheles stephensi (Liston) larvae. All combinations exhibited antagonism at concentrations lower than LC50 values and synergism at concentrations higher than their LC90 values. A 1 : 1 product ratio was the most effective.
Impact analysis of neem kernel extracts on the developmental profile of Anopheles stephensi
Preeti Sharma,Lalit Mohan,C.N. Srivastava 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.1
evaluation of the larvicidal effi-cacy ofAgeratum conyzoides,Argemone mexicanaand Azadirachta indicawas carried out againstAno-pheles stephensito develop an effective ecofriendlyinsecticide of plant origin. The methanol extract ofA. indicawas observed remarkably active with LC50values 18.2 and 13.1 ppm after 24 and 48 hours ofexposure. Petroleum ether extracts ofAg. conyzoideswith LC50 425.6 and 267.9 pm, carbon tetra chlo-ride extract ofAr. mexicanawith LC50 313.2 and240.3 ppm and petroleum ether extract ofAz. indicawith LC50 189.1 and 53. 5 ppm after 24 and 48hours of exposure were also found effective. Theimpact of Az.indica methanol extract on the lifecycle of malaria vector was further observed. Me-thanol extract of Az.indica causes deformities indifferent developmental stages of the malaria vector.Total developmental period was also extended from10 to 15 It remarkably influenced hatching rates,larval-pupal transformation and development, adultemergence and growth index. Larval and pupalKey words An. stephensi, Ageratum, Argemone,Azadirachta, phytoextract, metamorphosis, larvicide.
Growth Inhibitory Nature of Artemisia annua Extract against Culex quinquefasciatus (Say)
Preeti Sharma,Lalit Mohan,C.N. Srivastava 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.4
Petroleum ether (Pee), carbon tetrachloride (Cte) and methanol extract (Mee) of Artemisia annua, Chenopodium album and Sonchus oleraceus were screened for their efficacy against Culex quinquefasciatus larvae. Pee of A. annua, Mee of A. annua and Ch. album, Cte of A. Annua were found effective in descending order after 24 and 48 hrs of treatment. Pee of A. annua, the most potent extract with LC50 78.2 ppm was selected to study its influence on the development and metamorphosis of the culicine mosquito. The extract significantly affected the hatching, larval development, pupal transformation and also lengthened the larval and pupal periods. Growth index was remarkably reduced. Treated culicine eggs, larvae and pupae showed deformities including disruption of the body wall, distorted alimentary canal, damaged tracheal network and arrested histogenesis. The extract has remarkable effect on the metamorphosis and high larvicidal potential, hence, can be used as an effective alternative to the existing synthetic pesticides for the control of Cx. quinquefasciatus.
Prejwltta MAURYA,Lalit MOHAN,Preeti SHARMA,Lata BATABYAL,C. N. SRIVASTAVA 한국곤충학회 2007 Entomological Research Vol.37 No.3
Anopheles stephensi is the primary vector of malaria, an endemic disease in India. An effort to controlAn. stephensi larvae by leaf extracts of Aloe barbadensis (Liliaceae) and Cannabis sativa (Moraceae) was made under laboratory conditions. A carbon tetrachloride extract of A. barbadensis was the most effective of all the extracts tested for larvicidal activity against the anopheline larvae, with LC50 15.58and 8.04 p.p.m. after 24 and 48 h of exposure, respectively. Thus, the leaf extract of A. barbadensishas active components that could be useful as a larvicide of ecocongenial nature against malaria vectors.
Shrankhla,Preeti Sharma,Lalit Mohan,Chand Narayan SRIVASTAVA 한국곤충학회 2011 Entomological Research Vol.41 No.6
The larvicidal activity of the plant extracts Pseudocalymma alliaceum and Allium sativum were determined against Culex quinquefasciatus. The hexane extract of P. alliaceum and the petroleum ether extract of A. sativum exhibited larvicidal efficacy against Cx. quinquefasciatus larvae. Extracts of P. alliaceum resulted in concentrations that produced 50% mortality LC_50 and LC_90 values of 2.49 and 15.06 ppm, respectively, after 24 h and 1.16 and 8.45 ppm after 48 h. Extracts of A. sativum resulted in LC_50 and LC_90 values of 8.38 and 29.15 ppm after 24 h and 7.28 and 44.19 ppm after 48 h of exposure, respectively. The results indicate that the plant extract component(s) present in the hexane extract of P. alliaceum leaves demonstrated greater potential as an efficient larvicide than A. sativum against Cx. quinquefasciatus.
Prejwltta Maurya,Lalit Mohan,Preeti Sharma,C.N. Srivastava 한국곤충학회 2011 Entomological Research Vol.41 No.6
Fungal metabolites are attracting attention as potential microbial insecticides, and they are anticipated to overcome the problems of pesticide resistance and environmental pollution that are associated with the indiscriminate use of conventional synthetic insecticides. The relative bioefficacies of selected fungal pathogens, Aspergillus flavus, A. niger, A. parasiticus, Fusarium sporotrichoides and Penicillium verrucosum were observed against Anopheles stephensi and Culex quinquefasciatus larvae. A. flavus demonstrated the greatest bioefficacy with 50% lethal concentration (LC50) values of 9.54 and 10.98 ppm against Anopheles stephensi and Culex quinquefasciatus larvae, respectively, after 24-h exposure. The bioefficacy of A. flavus increased in both species with an exposure time of 48 h, with LC50 values of 7.26 and 8.55 ppm, respectively.