| behavioral and electroantennographic responses of the tea mosquito, helopeltis theivora, to female sex pheromones. | responses of the tea mosquito, helopeltis theivora (waterhouse) (hemiptera: miridae), a major pest of tea, to female sex pheromone compounds were measured using wind tunnel and electroantennogram (eag) bioassays. in the wind tunnel, male tea mosquitoes were found to be most attracted to a dichloromethane extract of the female thorax. gas chromatography-mass spectrometry (gc-ms) analysis of female thoracic extracts and dynamic head space samples of virgin females showed the presence of five compo ... | 2008 | 19161684 |
| reproductive activities of heliotropium indicum isolate against helopeltis theivora and toxicity evaluation in mice. | a new compound e was isolated from the methanolic extract of the leaves of heliotropium indicum by chromatographic fractionation. in the present study, the effect of the compound e on reproduction of helopeltis theivora has been evaluated. the acute toxicity study (ld50) and sub-acute toxicity studies (haematological, biochemical and histopathological parameters) in albino swiss mice were carried out to evaluate the safety aspect of the compound e. the compound showed significant inhibitory effe ... | 2012 | 23029910 |
| morphological and genetic diversity studies among populations of tea mosquito bug, helopeltis theivora from assam, india. | multilocus dna fingerprinting and morphometry were compared to evaluate genetic diversity of tea mosquito bug, helopeltis theivora waterhouse (hemiptera: miridae). eighty-one female individuals representing 27 populations of h. theivora from tea plantations of different regions of assam, india were collected and evaluated. observation of 12 characters i.e. body length, antennae length, head width, stylet length, thorax width, forewing length, forewing width, hind wing length, hind wing width and ... | 2014 | 25160907 |
| electro-antennographic response of helopeltis theivora to synthetic pesticides used in tea plantations. | helopeltis theivora is considered as one of the major pest in tea plantations causing considerable economic damage. recent control strategies against this notorious polyphagous pest mainly depend on the application of insecticides. the study is focused on the antennal response of h. theivora on exposure to different insecticides using electroantenogram (eag). the result showed that the insects perceive quinalphos as they are frequently exposed to it. the hierarchy of the eag response of exposed ... | 2017 | 29262713 |
| chitinase from pseudomonas fluorescens and its insecticidal activity against helopeltis theivora. | the tea mosquito bug (tmb), helopeltis spp. (hemiptera: miridae) is an insidious pest that poses a significant economical threat to tea plantations. pseudomonas cultures are being used extensively for pest management which, however, resulting in a low mortality rate of insects and which has prompted us to search for a new microbial metabolite for tmb control. a chitinase purified from p. fluorescens and partially characterized by our group showed insecticidal activity against tmb. the mode of ac ... | 2017 | 28680004 |
| antifeedant activity of plant extracts to an insect helopeltis theivora. | the different solvent extracts (viz petroleum ether ethyl acetate and methanol) obtained from leaves and flowers of heliotropium indicum and spilanthes calva were screened for antifeedant activity against helopeltis theivora. all the six different extracts showed antifeedant activity at four different concentrations. the methanolic extracts of leaves of heliotropium indicum and spilanthes calva exhibited significant activity at 4% concentration. the numbers of spots produced were only 18.67 and ... | 2010 | 21387902 |