Vol. 2, Issue 6 (2017)
Entomotoxicity of Chromolaena odorata, Tagetes minuta and Reichardia tingitana in suppressing oviposition and adult emergence of Callasobruchus chinensis (L) infesting stored chickpea seeds in U.P.
Author(s): BS Chandel, Arti Singh
Abstract: In the present investigation experiments were conducted in the Biopesticide and Toxicological plant product research laboratory, Department of Zoology, D.B.S. College, Kanpur, U.P., India. Extracts of ten asteraceous plant parts have been used for their biopotency against pulse beetle, Callosobruchus chinensis L. (Coleoptera: Bruchidae) on chickpea Cicer arietinum L. (Fabales: Fabaceae) Kabuli variety Mexican white. Estimation of their toxicity, oviposition deterrence and adult emergence against C. chinensis and treated chickpea seed weight loss and their germination was also assessed. Three concentrations viz. 0.5 per cent, 1.0 per cent and 2.0 per cent of each plant extract were selected and tested by dry film technique for early emerge beetles of C. chinensis. The data depicted from results maximum mean mortality of early emerged adults of C. chinensis was observed in Chromolaena odorata (83.08%) followed by Chrysanthemum cinerariaefolium (74.26) and Tagetes minutia (68.83), respectively. The maximum number of eggs laid per hundred extract treated grains was found in Mantisalca duriaei (257.00) followed by Inula racemosa (69.00) and Scorzonera undulate (51.33). Similarly, highest number of eggs bearing seeds per hundred seeds was observed in Inula racemosa (55.67) followed by Mantisalca duriaei (43.67) and Scorzonera undulate (42.00), respectively. It is seen that maximum number adults emergence was recorded in I. racemosa (143.00) followed by M. duriaei (134.33) > S. undulate (107.00) and promising percentage of seed infestation was recorded in I. racemosa (45.85) followed by M. duriaei (42.68) > S. undulate (35.07) while, maximum per cent seed weight loss was observed in Mantisalca duriaei (2.98) and Inula racemosa (2.90). It is also seen that maximum percent treated (2.0%) extracts of C. odarata treated showed 92 % seed germination followed by T. minuta 82 per cent and 84% in control.