EFFICACY OF CERTAIN NEWER INSECTICIDES AGAINST TERMITE, Odontotermes obesus AND RED ANT, Dorylus orientalis

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dc.contributor.advisorBhattacharyya, Badal
dc.contributor.authorSarmah, Kasturi
dc.date.accessioned2023-11-18T16:29:30Z
dc.date.available2023-11-18T16:29:30Z
dc.date.issued2021
dc.description.abstractpresent study was carried out to evaluate the efficacy of three newer insecticides (imidacloprid 70 WG, clothianidin 50 WDG and thiamethoxam 25 WG) against termite, Odontotermes obesus and red ant, Dorylus orientalis during 2020-21 in the AlNP- Soil Arthropod Pests Laboratory, Department of Entomology, AAU, Jorhat. Experimental findings revealed that among the three insecticides, thiamethoxam was found to be the most effective against termites with the highest per cent mortality of 42, 58, 74 and 95 per cent after 6, 12, 18 and 24 hours, respectively, at 100 ppm concentration. It was followed by clothianidin with 34, 45, 65 and 75 per cent mortality after 6, 12, 18 and 24 hours at 100 ppm concentration. For imidacloprid per cent mortality was registered as 33, 45, 62 and 68 per cent after 6, 12, 18 and 24 hours, respectively at 100 ppm concentration. The results also revealed that per cent mortality of termites increased gradually with increase in concentration as well as exposure period. The order of toxicity to O. obesus with respect to LC50 values at 24 hours after insecticidal treatment was thiamethoxam (2.59 ppm) > clothianidin (5.62 ppm) > imidacloprid (9.84 ppm). The order of toxicity with respect to LT50 values at 100 ppm concentration was thiamethoxam (8.22 hour) > clothianidin (11.32 hour) > imidacloprid (12.32 hour). Similarly, the data on mortality of D. orientalis revealed that among the three insecticides, thiamethoxam was found to be most effective with the highest per cent mortality of 64, 90, 100 and 100 per cent after 6, 12, 18 and 24 hours, respectively, at 1000 ppm concentration. Imidacloprid and clothianidin treatment registered per cent mortality 46, 58, 86, 98 and 26, 56, 98 and 100 per cent after 6, 12, 18 and 24 hours, respectively, at 1000 ppm concentration. Moreover, the per cent mortality of red ants increased gradually with increase in concentration of insecticides as well as exposure period. The order of toxicity to D. orientalis with respect to LC50 values after 24 hours exposure period was thiamethoxam (8.52 ppm) > clothianidin (14.93 ppm) > imidacloprid ( 31.88 ppm). The order of toxicity with respect to LT50 values at 1000 ppm concentration was observed as thiamethoxam (5.02 hour) > imidacloprid (7.53 hour) > clothianidin (9.03 hour).
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810201491
dc.language.isoEnglish
dc.publisherAAU, Jorhat
dc.subEntomology
dc.themeEfficacy of certain newer insecticides against termite, Odontotermes obesus and red ant, Dorylus orientalis
dc.these.typeM.Sc
dc.titleEFFICACY OF CERTAIN NEWER INSECTICIDES AGAINST TERMITE, Odontotermes obesus AND RED ANT, Dorylus orientalis
dc.typeThesis
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