International Journal of Advance Agricultural Research
ISSN: 2053-1265
Vol. 5(7), pp. 95-100, December 2017

Use of plant-derived insecticides for the control of Podagrica spp. of Abelmoschus esculentus (L.) in Southeastern Nigeria

Emeasor K. C.1, Uwalaka O. A.2 and Nnaji M. C.1

1Department of Plant Health Management, College of Crop and Soil Sciences, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria.
2National Horticultural Research Institute, Mbato Outstation, Okigwe, Imo State, Nigeria.

*To whom correspondence should be addressed. E-mail:

Received 19 October, 2017; Received in revised form 07 December, 2017; Accepted 11 December, 2017.


Damage, Okra, Plant extracts, Podagrica spp., Population.

A field experiment was conducted in 2015 cropping season to evaluate the efficacy of some plant-derived insecticides against okra flea beetles, Podagrica uniforma and Podagrica sjostedti. The plant materials evaluated included leaves and stems of castor oil plant (Ricinus cummunis), Barbados nut plant (Jatropha curcas) and Goat weed (Ageratum conyzoides). The okra [Abelmoschus esculentus (L.) Moench] variety used was NH47 - 4. The leaves and stems of the plants used in the experiment were collected from Ntalakwu in Bende L.G.A., Abia State Nigeria, washed, air-dried and then ground to a fine powder. The experimental design was randomized complete block design (RCBD) with seven treatments and four replicates. The efficacy of the treatments was evaluated based on reduction in population of the flea beetles. The results obtained show that all the plant materials tested significantly at P<0.05 reduced P. uniforma and P. sjostedti infestation with low damage and high fruit yield when compared with the untreated plots. Among all the treatments evaluated, Ricimus cummunis stem, A. conyzoides stem, and J. curcas leaf aqueous extracts significantly (P<0.05) reduced the population of the two flea beetles with percentage reduction of 63.38, 57.08 and 55.24%, respectively. The plots treated with J. curcas stems had the highest fruit yield of 11.67 kg/ha and significantly (P<0.05) had the least fruit damage 0.25 kg/ha when compared with other plant extracts. The potential of plant derived insecticides in controlling these insect pests of okra have been proven and hence could be a good alternative for synthetic insecticide because of their attendant benefits.

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