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Advances in Agriculture
Volume 2019, Article ID 6704834, 6 pages
https://doi.org/10.1155/2019/6704834
Research Article

Effectiveness of Tephrosia vogelii and Tephrosia candida Extracts against Common Bean Aphid (Aphis fabae) in Malawi

1Department of Land Resources Conservation, Mulanje District Agriculture Office, P.O. Box 49, Mulanje, Malawi
2Department of Forestry, Faculty of Environmental Sciences, Mzuzu University, Private Bag 201, Luwinga, Mzuzu 2, Malawi
3Department of Agricultural Research Services, Bvumbwe Agricultural Research Station, P.O. Box 5748, Limbe, Malawi
4Department of Agricultural Research Services, Mkondezi Agricultural Research Station, P.O. Box 133, Nkhata Bay, Malawi

Correspondence should be addressed to Chicco D. M. Kayange; moc.liamg@0102egnayakoccihc

Received 5 November 2018; Revised 24 April 2019; Accepted 25 June 2019; Published 28 July 2019

Academic Editor: Gábor Kocsy

Copyright © 2019 Chicco D. M. Kayange et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Common beans (Phaseolus vulgaris) remain an important dietary protein source in Malawi. However, its production is highly hindered by insect pest and disease attack. The study aimed at evaluating the effectiveness of Tephrosia vogelii and Tephrosia candida extracts against bean aphid (Aphis fabae). The evaluation involved two botanical extracts at three different concentrations (0.5%, 2%, and 5% w/v) against bean aphid. Plant extracts (leaves) were air-dried and milled. Powders were then soaked in a 2-litre plastic bucket of cold water. Results indicated that there was significant difference (P<0.05) among treatments. The effectiveness of the treatments was based on reduction in aphid population per plant, pod length, and bean yield. Pod length and bean yield were higher in T. vogelii and Karate as compared to untreated and T. candida. There was a high mortality rate of aphid on the plots treated with T. vogelii compared to plots treated with T. candida at the same concentration. Though these two plant extracts were not as effective as the synthetic insecticide in reducing aphid population, they were considerably and significantly found to be effective; hence, its use by poor-resource farmers is recommended in the protection of bean against aphid.