Anju Bharti, Indrani Dubey and BS Chandel

To evaluate the effectiveness of selected asteraceous botanical extractives in management of spotted bollworm, Earias vittella Fabricius (Lepidoptera: Noctuidae) an experiment was conducted in the plant product laboratory, Department of Zoology, D.B.S. College, Kanpur Nagar during 2021.Phago-repellent effectiveness of ten indigenous naturally occurring asteraceous plant extracts viz., aerial parts of Cichorium intybus (L.), Chromolaena odorata Linn., Chrysanthemum cinerariaefolium (trev.) Vis., Inula racemosa Hook. F., Mantisalca duriaeri Birq. Et Cavill., Reichardia tingitana (L.) Roth, Rhaponticum acaule (L.) DC, Scorzonera undulate Vahl, Spilanthes paniculata Well ex DC and Tagetes minuta Linn. were prepared under the laboratory conditions. For testing the phago-repellent effect, the okra leaves were used as food against larvae of Earias vittella. In each set of extract and one control was introduced, where the leaves pieces were dipped in Benzene + emulsified water only. The okra leaf pieces fastened under clip and left under electric fan for about thirty minutes, so as to complete dry up the extract. The treated foods were kept in jar (23cm x 10cm) on moist filter paper. Then third instars, 24 hours starved larvae of E. vittella were released in each jar. After four hours of the release of larvae the data was collected on the number of larvae reached and repelled at each treated food. Three replication of treatment were made. The data depicted from the results in the present experiment of repellent test against larvae of Earias vittella. All the plant extracts showed a good repellent property, when compared with the control. The repellent property was observed based on their EC₅₀ values as: C. intybus (0.0823) > I. racemosa (0.1043) > T. minuta (0.1620) > C. cinerariaefolium (0.1677) > M. duriaeri (0.1788) > S. undulate (0.3127) > A. paniculata, (0.3805) > R. acaule (0.4405) > R. tingitana (0.6368) > C. odorata (0.8870), respectively. The relative EC₅₀ values of the above extracts are in descending order, 10.7700 > 8.5043 > 5.4753 > 5.0227 > 4.9608 > 2.8365 > 2.3311 > 1.3929 > 1.0000 times as repellents, where as C. odorata is taken as a unit.

DOI: 10.22271/23940522.2021.v8.i3a.824

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