Loko Yêyinou Laura Estelle, Toffa Joelle, Djegbe Innocent, Vodounnon Armand, Sinzogan Antonio, Sahayaraj Kitherian, Tamo Manuele
Laboratoire de Zoologie Appliquée et Santé des Végétaux (ZASVE), Ecole Nationale Supérieure des Biosciences et Biotechnologies Appliquées (ENSBBA), Université Nationale des Sciences, Technologies, Ingénierie et Mathématiques (UNSTIM), Dassa-Zoumé, Collines, BP 14, Benin.
Ecole Normale Supérieure de Natitingou, Université Nationale des Sciences, Technologies, Ingénierie et Mathématiques (UNSTIM), BP 72 Natitingou, Benin.
Open Res Afr. 2025 Jan 2;7:7. doi: 10.12688/openresafrica.15173.2. eCollection 2024.
Lesne (Coleoptera: Bostrichidae) is the main pest of stored dried yam chips that causes significant losses in less than 3 months. The assassin bug, (Montrouzier & Signoret) (Hemiptera: Reduviidae) and the African mahogany ( (Desv.) A. Juss. (Meliaceae)), the ackee ( K. Koenig (Sapindaceae)), and bridelia ( Benth. (Euphorbiaceae)) leaf powders have proven to be efficient in the control of this pest.
This study aims to evaluate the compatibility of the leaf powders of these medicinal plants and the predator in the integrated management of under laboratory and farm conditions. Various leaf powders were tested at a concentration of 6% (w/w) with or without the predator. Infested yam chips without any treatment served as negative control and those mixed with a synthetic insecticide as positive control. The mortality rate of was recorded under laboratory conditions. While, the dynamic population of , their damage, and weight loss of yam chips were recorded 8 weeks after treatment under farm conditions.
The results revealed that no combination of leaf powders and predators could induce complete mortality of like the synthetic insecticide. No significant difference in terms of the survival of exposed to botanical powders was observed compared to the positive control. Under farm conditions, leaf powder showed a sub-lethal effect on the predator and no impact on the abundance of . However, the survival of was significantly reduced by the combination of leaf powder and which did not allow the reproduction of the predator.
Our results suggest that an augmentative biological control program with the release of after the introduction of leaf powder is practicable for the management of in yam chips.
莱斯内蠹虫（鞘翅目：长蠹科）是储存干薯片的主要害虫，在不到3个月的时间内就会造成重大损失。猎蝽（蒙氏猎蝽，半翅目：猎蝽科）以及非洲桃花心木（非洲桃花心木，楝科）、西非荔枝果（西非荔枝果，无患子科）和土蜜树（土蜜树，大戟科）叶粉已被证明对控制这种害虫有效。
本研究旨在评估这些药用植物叶粉与捕食性天敌在实验室和农场条件下对莱斯内蠹虫综合管理中的兼容性。各种叶粉在有或没有捕食性天敌的情况下以6%（w/w）的浓度进行测试。未经任何处理的受侵染薯片用作阴性对照，与合成杀虫剂混合的薯片用作阳性对照。在实验室条件下记录莱斯内蠹虫的死亡率。同时，在农场条件下处理8周后记录莱斯内蠹虫的动态种群、它们造成的损害以及薯片的重量损失。
结果表明，没有叶粉和捕食性天敌的组合能像合成杀虫剂那样使莱斯内蠹虫完全死亡。与阳性对照相比，未观察到接触植物性粉末的莱斯内蠹虫在存活率方面有显著差异。在农场条件下，土蜜树叶粉对捕食性天敌蒙氏猎蝽显示出亚致死效应，对莱斯内蠹虫的数量没有影响。然而，土蜜树叶粉和西非荔枝果叶粉的组合显著降低了莱斯内蠹虫的存活率，且不允许捕食性天敌繁殖。
我们的结果表明，在引入土蜜树叶粉后释放蒙氏猎蝽的增殖性生物防治方案对于管理薯片中的莱斯内蠹虫是可行的。
