Medicinal plant extract contains bioactive molecules and these molecules are benefited to mitigate, eradicate or cure diseases. In advent to search for new medicinally important plant, the current paper deals to select the most effective and promising plants which are suitable for controlling tea leaf’s thrips (Scirtothrips bispinosus) based on extracts concentration and death affect over time. To fulfill the specific objectives, five medicinal plants extracts viz. Ipomoea crassicaulis, Lantana camara, Ipomoea hederaceaa, Glycosmis arborea, and Justicia gendarussa had been used with four different concentrations. From statistical analysis using One-way ANOVA and post hoc test, it was found that Ipomoea crassicaulis and Lantana camara are the most promising of all the experimented plants extracts based on both time and concentration. In the study, average mortality was found 0.47, 1.67, 1.93 and 2.53 for concentration of 1%, 5%, 10% and 15% respectively. Analysis based on different concentrations reveals that average mortality of thrips increases significantly with the increase of concentrations. Coefficient of variance was found minimum for Ipomoea crassicaulis and Lantana camara plants with range of 5.44 to 6.71 based on time and concentration. So, it could be concluded that these two plants are the most effective plants for controlling the tea thrips. For the other plants, ranks were found as Ipomoea hederaceaa, Glycosmis arborea and Justicia gendarussa respectively as well. J. bio-sci. 28: 87-93, 2020
Bioactive chemicals found in medicinal plant extracts aid in the mitigation, eradication and cure of diseases of living animals and plants. In the quest for novel medicinally significant plants, the current article focuses on determining the most successful and promising plants for suppressing tea leaf thrips (Scirtothrips bispinosus) through applying statistical model. 22 medicinal plants extraction had been used to achieve the stated goals of the study. Plant extract solutions were dissolved in their respective solvents at varied concentrations for the assessment of entomopathogenic activity, namely 1, 5, 10 and 15%. According to the Translog stochastic frontier model, the level of solution concentration has had a substantial negative influence on the mortality of tea thrips, with thrips mortality increasing dramatically as the concentration level was decreased. The technical effectiveness of the mortality showed that plant extracts and their related features were over 98 percent effective in controlling tea thrips, as opposed to chemicals and pesticides. Bangladesh J. Bot. 51(3): 401-410, 2022 (September)
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