Bioeffecacy of medicinal and aromatic plant oils against Bihar hairy caterpillar, Spilarctia obliqua (Walker)
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Date
2006-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
During the investigation on bioactivity of nine medicinal and aromatic plant oils against Spilarctia obliqua (Walker), (Arctiidae: Lepidoptera), the plant oil of Cymbopogon martini and Cymbopogon citratus grouped under extreme antifeedant class at 1, 3, and 5 percent oil concentration. Whereas the plants oil of Eucalyptus globulus, Mentha spicata and Pelargonium odoratirum grouped under moderate antifeedant class at 3% oil concentration. And Mentha arvensis, Mentha pipperata and P.odoratirum grouped under strong antifeedant class at 3% concentration. E. globulus, C.nardus and M. spicata showed moderate antifeedant activity at the same.
Lowest LC30, LC50 and LC90 (highest toxicities) was found in oil of A. indica after 6, 12, 24, 48 and 72 hour of acute exposure and highest LC30, LC50 and LC90 (lowest toxicities) was found in oil of M. pipperata, C. martini, M. spicata and P.odoratirum.
Highest larval weight gain was found when larvae fed on M. arvensis treated oil and lowest in C. citratus and A. indica. Highest pupal weight was found in E. globulus, & M.arvensis and lowest C.citratus and A. indica. Maximum mean larval and mean pupal period was found in C. martini and C. nardus while minimum in C.citratus, whereas highest percent pupation and adult emergence was found in E. globulus and lowest in C. martini and C. nardus. Highest percent egg laying was found in M. pipperata, C. martini and M.arvensis treated oil and lowest was found in C. martini, C. nardus and C. citratus at 0.25%, 0.5% and 1.0% concentration. Highest percent hatching was found in C. citratus and M.spicata treated oil and lowest in E. globulus and P. odoratirum treated oil. While maximum incubation period was found on M. spicata, E. globulus and minimum in C. citratus, M. arvensis, C. martini and E. globulus.
Larval pupal deformities were found in C. martini; C. citratus, C. nardus and A. indica and highest adult deformities were found in C. citratus A. indica and C. nardus. while highest total deformities was found in C. citratus. Thus it is clear that plant oils affect the egg laying, feeding, growth and development of Spilarctia obliqua (Walker).
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