Plant Production Systems Group, Wageningen University & Research, Wageningen, The Netherlands.
International Institute of Tropical Agriculture, Kampala, Uganda.
PLoS One. 2023 Mar 10;18(3):e0282493. doi: 10.1371/journal.pone.0282493. eCollection 2023.
Banana weevil (Cosmopolites sordidus, Germar) is a major pest in East African Highland Banana. The influence of crop nutritional status on weevil damage is poorly understood. Nutrient availability affects the nutritional quality of plants for weevils and may affect weevil damage. Here, we evaluate the effect of insecticides alone and in combination with fertilisers (N, P, K and Si) on weevil damage using data from two experiments in central and southwest Uganda. In the first experiment, we varied chlorpyrifos and application rates of N, P and K. In the second experiment, we varied the application rates of K and Si. Treatment effects were analysed using generalised linear mixed models with a negative binomial distribution. In the first experiment, chlorpyrifos reduced and N increased weevil damage, while P and K had no significant effect. In the K or Si application rates reduced weevil damage compared with the control. We conclude that the combined application of chlorpyrifos with K and Si fertilisers can contribute to weevil damage control on sites with low nutrient availability and should form part of integrated weevil management in bananas. Future studies should assess how much reduction in insecticide use is possible in EAHB with judicious input rates.
香蕉象鼻虫（Cosmopolites sordidus，Germar）是东非高地香蕉的主要害虫。作物营养状况对象鼻虫危害的影响还知之甚少。养分供应会影响象鼻虫赖以生存的植物的营养价值，从而可能影响象鼻虫的危害程度。本研究使用来自乌干达中部和西南部的两个实验的数据，评估了杀虫剂单独使用和与肥料（N、P、K 和 Si）联合使用对象鼻虫危害的影响。在第一个实验中，我们改变了毒死蜱和 N、P、K 的应用率。在第二个实验中，我们改变了 K 和 Si 的应用率。使用具有负二项分布的广义线性混合模型分析处理效果。在第一个实验中，毒死蜱降低了象鼻虫的危害，而 N 增加了象鼻虫的危害，而 P 和 K 则没有显著影响。与对照相比，K 和 Si 的应用率降低了象鼻虫的危害。我们的结论是，在养分供应不足的地区，将毒死蜱与 K 和 Si 肥料联合使用可以有助于控制象鼻虫的危害，这应成为香蕉象鼻虫综合治理的一部分。未来的研究应评估在 EAHB 中，通过合理的投入率，减少使用杀虫剂的可能性有多大。
