Efficacy of Alstonia boonei powders and extracts against Dermestes maculatus (Coleoptera: Dermestidae) infesting stored smoked dried catfish (Claria gariepinus) were investigated in the laboratory. The products were tested at 2.5 g, 5.0 g, 7.5 g, 10 g, 12.5 g and 15 g and 1%, 2%, 5%, 10%, 15% and 20%/100 g of smoked catfish respectively. The ability of the plant to protect smoked catfish in terms of mortality rates, number of eggs laid and adult emergence were evaluated. All the tested plant parts caused significant mortality (P < 0.05) of adult D. maculatus. Alstonia boonei stem bark powder was the most potent, causing 100% mortality at 7.5 g of 8 days post exposure, followed by leaf powder which evoked 87.5% mortality after 10 days of exposure. For the extracts, adult mortality of D. maculatus was positively correlated with dose and exposure duration. Alstonia boonei product extracts significantly reduced the development of D. maculatus compared to the control. Stem bark extract significantly prevented oviposition. The use of A. boonei stem bark is advocated for the control of D. maculatus infestation. Further study is needed to characterize the chemical constituents and understand its mode of action with the likely formulation into herbal insecticide as alternative to synthetic insecticides.

中文翻译：

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Alstonia boonei De wild 对斑纹皮蠹（鞘翅目：皮蠹科）侵染熏鲶鱼 Claria gariepinus（双鱼座：Clariidea）的繁殖性能的杀虫作用

在实验室中研究了 Alstonia boonei 粉末和提取物对感染储存的熏干鲶鱼 (Claria gariepinus) 的斑纹皮蠹（鞘翅目：Dermestidae）的功效。产品分别在2.5克、5.0克、7.5克、10克、12.5克和15克以及1%、2%、5%、10%、15%和20%/100克烟熏鲶鱼下进行测试。评估了植物在死亡率、产卵数和成虫羽化方面保护熏鲶鱼的能力。所有测试的植物部分都导致成年 D. maculatus 的显着死亡率（P < 0.05）。Alstonia boonei 茎皮粉是最有效的，暴露后 8 天在 7.5 g 时导致 100% 的死亡率，其次是叶粉，在暴露 10 天后引起 87.5% 的死亡率。对于提取物，D. 黄斑与剂量和暴露时间呈正相关。与对照相比，Alstonia boonei 产品提取物显着降低了 D. maculatus 的发展。茎皮提取物显着防止产卵。提倡使用 A. boonei 茎皮来控制 D. maculatus 的侵染。需要进一步研究以表征化学成分并了解其作用模式，可能将其配制成草药杀虫剂作为合成杀虫剂的替代品。