消除了沙地土壤中马拉德拉福莫斯科 (Coleoptera: Scarabaeidae) 占主导地位的解释
Adrian J Pekarcik1, Christopher M Ranger2, Elizabeth Y Long3
1USDA, Agricultural Research Service, North Central Agricultural Research Laboratory, 2923 Medary Ave., Brookings, SD 57006, USA.
Journal of economic entomology
|June 27, 2024
概括
野地玉米受到Maladera formosae幼虫的感染在沙土中更为常见,但土壤类型不会影响幼虫的存活率或植物吸收新类杀虫剂. 其他因素可能解释了沙中更高的虫种群.
科学领域:
- 农业昆虫学 农业昆虫学
- 土壤科学 土壤科学
- 虫害管理 虫害管理 虫害管理
背景情况:
- 在美国的田间玉米中广泛使用neonicotinoid种子处理方法来控制居住在土壤中的昆虫害虫.
- 已经观察到Maladera formosae幼虫在玉米上食用克洛西亚尼丁种子处理,有事证据表明限制在沙土上.
研究的目的:
- 为了确定玉米中马拉德拉福莫斯卡幼虫的种群是否仅限于沙土.
- 评估土壤类型对M. formosae存活率的影响.
- 调查土壤类型是否影响玉米植物吸收克洛西安丁,这可能解释了种群差异.
主要方法:
- 实地调查比较了同一玉米田内的沙土和土壤土壤中的虫种群.
- 实验室实验评估不同类型土壤中的虫生存率.
- 随着时间的推移,在沙土和泥土土壤中种植的玉米根和芽中量化克洛西安丁度.
主要成果:
- 在沙土中发现了近10倍的虫密度 (>80%的沙子含量) 与泥土 (<80%的沙子含量) 相比.
- 土壤类型没有显著影响虫到成年阶段的存活率.
- 在两种土壤类型中,玉米根和芽中的克洛西安丁度相似,在两周内显著下降,与对照组相比.
结论:
- 即使在同一田地内,沙土中Maladera formosae幼虫的较高丰度并不是由土壤类型的差异影响虫生存或克洛西安丁的吸收而解释的.
- 除了暴露在杀虫剂和土壤类型之外的其他因素可能有助于观察到这些幼虫在田间玉米生态系统中的分布.
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