Insecticidal properties of some plants of family asteraceae against Spilosoma obliqua
2003
Gautam, K. | Rao, P.B. | chauhan, S.V.S(G.B.Pant University of Agriculture and Technology, Pantnagar (India). Department of Biological Sciences)
Methanol extracts of 24 species of family Asteraceae were examined in-vitro for their insecticidal activity against Spilosoma obliqua Wk., an important insect. Mortality count of insect increased with the increase in the concentration of various plant extracts. 1000 jig ml/' extract of Saussurea heteromala was most effective (65.3% mortality) followed by Cichorium intybus (54.6%), Vernonia cinerea (38.6%) at 72 h as compared to extracts of other species. At 24 and 48 h intervals also Cichorium intybus was most effective but next to it was in Saussurea heteromala followed by Vernonia cinerea at 48 h and Vernonia cinerea followed by Blumea sp. 1 at 24 h. Significant effect was also observed with 200 (ng nil/' extract of Saussurea heteromala (26.6%) followed by Cichorium intybus (22.6%) followed by Vernonia cinerea (18.6%) and Cichorium intybus (21.3%) followed by Vernonia cinerea at 72, 48 and 24 h intervals respectively. Therefore, the extract of Saussurea heteromala, Cichorium intybus and Vernonia cinerea can be used to control Spilosoma obliqua.
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