Vinha Germano Lopes, Plata-Rueda Angelica, Soares Marcus Alvarenga, Zanuncio José Cola, Serrão José Eduardo, Martínez Luis Carlos
Department of Crop Science, Federal University of Viçosa, Viçosa 36570000, Brazil.
Department of Entomology, Federal University of Viçosa, Viçosa 36570000, Brazil.
Insects. 2021 May 22;12(6):483. doi: 10.3390/insects12060483.
(J.E. Smith) (Lepidoptera: Noctuidae) is the main pest of maize crops, and effective methods for pest management are needed. The insecticidal efficacy of deltamethrin was evaluated against for toxicity, survival, locomotion, anti-feeding, and histological changes in the midgut. Concentration-mortality bioassays confirmed that deltamethrin (LC = 3.58 mg mL) is toxic to caterpillars. The survival rate was 99.7% in caterpillars not exposed to deltamethrin, decreasing to 50.3% in caterpillars exposed to LC, and 0.1% in caterpillars treated with LC. demonstrated reduced mobility on deltamethrin-treated surfaces. Deltamethrin promoted a low respiration rate of for up to 3 h after insecticide exposure, displaying immobilization and inhibiting food consumption. Deltamethrin induces histological alterations (e.g., disorganization of the striated border, cytoplasm vacuolization, and cell fragmentation) in the midgut, damaging the digestive cells and peritrophic matrix, affecting digestion and nutrient absorption.
（J.E. 史密斯）（鳞翅目：夜蛾科）是玉米作物的主要害虫，因此需要有效的害虫管理方法。评估了溴氰菊酯对其毒性、存活率、运动能力、拒食作用以及中肠组织学变化的杀虫效果。浓度-死亡率生物测定证实溴氰菊酯（LC = 3.58毫克/毫升）对该毛虫有毒。未接触溴氰菊酯的毛虫存活率为99.7%，接触LC的毛虫存活率降至50.3%，用LC处理的毛虫存活率为0.1%。在经溴氰菊酯处理的表面上，其活动能力降低。接触杀虫剂后长达3小时，溴氰菊酯使该毛虫的呼吸速率降低，表现出行动迟缓并抑制食物消耗。溴氰菊酯会引起中肠组织学改变（如纹状缘紊乱、细胞质空泡化和细胞破碎），损害消化细胞和围食膜，影响消化和营养吸收。
