Article Number: DRJAFS20807377
DOI: https://doi.org/10.26765/DRJAFS20807377
ISSN: 2354-4147

Vol. 10(6) Pp. 151-160, June 2022

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Creative Commons Attribution License 4.0.


Original Research Article

Assessment of Insecticidal Activity of Some Botanical Powders and Clay against the Weevil [Callosobruchus Maculatus (Fab.) (Coleoptera: Chrysomelidae)] on Stored Mungbean (Vigna Radiata (L.)) Wilczek Seeds

Chukwu, L. A.*

Emeasor, K. C.

Asawalam, E. F.


Abstract

The insecticidal potential of powders obtained from Piper guineense, Tephrosia vogelii, Xylopia aethiopica, and Carica papaya, clay, and permethrin against cowpea beetle, Callosobruchus maculatus on mung bean seeds was tested in the laboratory. The tests were carried out in a laboratory environment (28+30C and 75+5%R.H.). Twenty (20) grams of mung bean seeds in plastic vials were exposed to ten (10) adult beetles (5 males and 5 females) and independently treated with varied concentrations (0, 1, 2, 3g) of the plant materials, clay, and permethrin. The treated seeds’ adult mortality, oviposition, offspring emergence, seed weight loss, and viability were all evaluated. The findings revealed that mortality rose considerably (P<0.05) with greater dosages and longer exposure times. When compared to the control, oviposition and progeny emergence were significantly reduced by the botanicals. Permethrin powder outperformed the other treatments (P<0.001) in terms of insecticidal activity. When compared to the control, all of the test plant materials showed variable amounts of insecticidal activity. T. vogelii leaf powder had the highest seed protectant effect among the plant materials studied, with 3.0 g/ 20 g in all parameters evaluated, followed by P. guineense powder. The percentage of seed weight loss and seed damage reduced as treatment dosage was increased. When compared to untreated seeds, the viability and proximate composition of seeds treated with plant materials, clay, and permethrin were not changed. The existence of bioactive chemicals namely alkaloid, flavonoids, tannins, saponins, phenols, and phytates was detected by phytochemical investigations of the various plant materials. The insecticidal effects demonstrated in the study could be attributed to these phytochemical compounds. As a result of their efficacy, these test plant materials could be used as an alternative to synthetic insecticides in the control of C. maculatus of stored mung bean.


Keywords: Callosobruchus maculatus, weevils, mung bean, biopesticides, toxicity, insect mortality


 Received: May 3, 2022  Accepted: June 24, 2022  Published: June 30, 2022


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