Improving Sphenophorus levis Adult Mortality Through Solid Insecticide Applications and Increased Insecticide Dose.

IF 1.4 3区 农林科学 Q2 ENTOMOLOGY Neotropical Entomology Pub Date : 2024-12-01 Epub Date: 2024-10-01 DOI:10.1007/s13744-024-01204-y
Pedro Henrique Urach Ferreira, Marcelo da Costa Ferreira, Eliane Vieira
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Abstract

The sugarcane weevil (Sphenophorus levis Vaurie, 1978) is currently considered the most important sugarcane pest in Brazil, causing significant yield losses. Application methods of insecticides for S. levis control have not been effective, mostly due to the insect's cryptic behavior below the soil surface which suppresses the correct placement of insecticide active ingredients on target. Two experiments were conducted using an innovative bioassay methodology that simulates sugarcane field conditions to effectively evaluate S. levis adult mortality and insecticide residues in the soil under different treatments. The first experiment aimed to assess the efficacy of two liquid- and solid-applied insecticides, while the second aimed to examine the effect of increasing the dose of lambda-cyhalothrin + thiamethoxam on S. levis adult control. The novel bioassays simulated liquid and solid insecticide applications on sugarcane by exposing S. levis adults to chemical residuals on rhizomes and in soil after insecticide application. In the first experiment, low S. levis adult control was detected (< 53% mortality) across all treatments, where both solid and liquid applications of lambda-cyhalothrin + thiamethoxam provided greater efficacy levels than imidacloprid and control treatments, respectively. Solid applications maintained higher insecticide concentrations in the soil for longer periods than liquid insecticide applications, providing maximum insect control levels 7 days after application. The second experiment revealed that solid applications at higher insecticide doses significantly improved control of S. levis adult (76.7% mortality) and resulted in greater insecticide concentrations in the soil compared to the recommended label rate (58.8% mortality).

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通过施用固体杀虫剂和增加杀虫剂剂量提高 Sphenophorus levis 成虫死亡率。
甘蔗象鼻虫(Sphenophorus levis Vaurie,1978 年)目前被认为是巴西最重要的甘蔗害虫,造成了巨大的产量损失。用于控制甘蔗象鼻虫的杀虫剂施用方法效果不佳,主要原因是这种昆虫在土壤表层以下的隐蔽行为抑制了杀虫剂活性成分在目标位置的正确施用。我们采用创新的生物测定方法进行了两项实验,模拟甘蔗田间条件,有效评估了不同处理下的利维斯成虫死亡率和杀虫剂在土壤中的残留量。第一项实验旨在评估两种液体和固体施用杀虫剂的功效,第二项实验旨在研究增加高效氯氰菊酯+噻虫嗪的剂量对雷韦氏甘蔗成虫控制的影响。新型生物测定模拟了在甘蔗上施用液体和固体杀虫剂的情况,方法是在施用杀虫剂后让莱维斯成虫接触根茎和土壤中的化学残留物。在第一个实验中,检测到了较低的莱维斯成虫控制率 (
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来源期刊
Neotropical Entomology
Neotropical Entomology 生物-昆虫学
CiteScore
3.30
自引率
5.60%
发文量
69
审稿时长
6-12 weeks
期刊介绍: Neotropical Entomology is a bimonthly journal, edited by the Sociedade Entomológica do Brasil (Entomological Society of Brazil) that publishes original articles produced by Brazilian and international experts in several subspecialties of entomology. These include bionomics, systematics, morphology, physiology, behavior, ecology, biological control, crop protection and acarology.
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