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Impact of sublethal doses of Piper guineense (Schum and Thonn) on the biological parameters of Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae) reared on different cowpea varieties

[Display omitted] •The response of C. maculatus to P. guineense was influenced by the variety of the stock culture.•Fecundity, hatchability, and survival differed among the exposed varietal populations.•Oviposition and hatchability index of C. maculatus postively correlated with the cowpea varieties...

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Bibliographic Details
Published in:Journal of Asia-Pacific entomology 2021, 24(3), , pp.622-628
Main Authors: Gbaye, Olajire Ayo, Oladipupo, Seun Olaitan, Oyeniyi, Emmanuel Ayobami, Oladipupo, Temitope Halimat
Format: Article
Language:English
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Summary:[Display omitted] •The response of C. maculatus to P. guineense was influenced by the variety of the stock culture.•Fecundity, hatchability, and survival differed among the exposed varietal populations.•Oviposition and hatchability index of C. maculatus postively correlated with the cowpea varieties.•Varietal difference, and not just exposure to sublethal doses of P. guineense, explained observed response.•Thus, white cowpea seeds predisposed C. maculatus to sublethal effects of P. guineense  than colored seeds. Cowpea varieties show a wide range of characteristics in their composition that can determine Callosobruchus maculatus (Fabricius) response and survival. Consequently, this work investigated the influence of sublethal doses of Piper guineense on C. maculatus raised on four cowpea varieties: ART-98–12, Niger White, Oloyin, and Ife Brown. Our results demonstrated that C. maculatus from different varieties, despite being reared under the same conditions, responded differently to sublethal doses of P. guineense. Cowpea beetles from ART-98–12 were the most susceptible while those reared on Ife Brown were the least susceptible. Across varieties, survival and reproductive parameters of C. maculatus differed. Furthermore, the ranking for the percentage reduction in the number of eggs laid by C. maculatus was ART-98–12 > Niger White > Oloyin > Ife Brown. According to the log-rank statistic test, the difference observed in C. maculatus’ survival can be explained by variety (log-rank statistic: χ2 [df = 3, N = 16] = 15, p = 0.004). Conversely, the survivability of the chrysomelid beetles reared on Niger white was significantly lower (p = 0.012) compared to the other varieties. This study highlights the role of cowpea variety in dictating the efficacy of a given botanical against C. maculatus.
ISSN:1226-8615
1876-7990
DOI:10.1016/j.aspen.2021.05.008