School of Breeding and Multiplication, Sanya Institute of Breeding and Multiplication, Hainan University, Sanya, China.
School of Tropical Agriculture and Forestry, Hainan University, Danzhou, China.
Arch Insect Biochem Physiol. 2024 Aug;116(4):e22141. doi: 10.1002/arch.22141.
Megalurothrips usitatus Bagnall, an important pest of bean plants, is primarily managed with synthetic insecticides. M. usitatus has developed considerable resistance to various insecticides in multiple cowpea-growing areas in Hainan Province, China, posing challenges to its control in the field. Light control technology is a potentially effective physical control method for M. usitatus. The vision of thrips is highly sensitive to UV light, whereas other biological characteristics remain unknown. Therefore, this study evaluated the effects of ultraviolet light on the biological characteristics of M. usitatus. Results showed that the egg, larval, and pupal stages of M. usitatus were significantly shortened, and the emergence rate (79.59%) and adult survival rate (77.95%) were reduced under a devoid of UV light environment (UV-), compared with the full-spectrum light (control treatment group, CK) (p < 0.05). However, the single spawning quantity and total amount of spawning were significantly higher, and the sex ratio (57%) was the highest under UV- (p < 0.05). Single UV light (UV+) only affected the pupation rate. Also, the antioxidant enzymes, polyphenol oxidase, superoxide dismutase (SOD), and peroxidase activities were significantly and negatively correlated with the progression of generations under UV-, whereas catalase and SOD activities were significantly and positively correlated with the progression of generations under UV+. The UV- light conditions significantly interfered with the behavior selection of M. usitatus. The results of this study showed that the adaptability of M. usitatus populations would be greatly reduced in the absence of ultraviolet light, providing a theoretical basis for the control of M. usitatus populations.
烟蓟马是豇豆的重要害虫，主要通过使用合成杀虫剂进行防治。在中国海南省的多个豇豆种植区，烟蓟马已对多种杀虫剂产生了相当大的抗性，这给田间防治带来了挑战。光照控制技术是一种针对烟蓟马的潜在有效物理防治方法。蓟马的视觉对紫外线高度敏感，而其他生物学特性尚不清楚。因此，本研究评估了紫外线对烟蓟马生物学特性的影响。结果表明，在缺乏紫外线的环境（UV-）下，烟蓟马的卵、幼虫和蛹期明显缩短，且羽化率（79.59%）和成虫存活率（77.95%）均低于全光谱光照（对照处理组，CK）（p<0.05）。然而，在 UV-（p<0.05）下，单雌产卵量和总产卵量显著增加，且性别比例（57%）最高。单一紫外线（UV+）仅影响化蛹率。此外，在 UV-下，抗氧化酶、多酚氧化酶、超氧化物歧化酶（SOD）和过氧化物酶活性与世代进展呈显著负相关，而在 UV+下，过氧化氢酶和 SOD 活性与世代进展呈显著正相关。UV- 光照条件显著干扰了烟蓟马的行为选择。本研究结果表明，在缺乏紫外线的情况下，烟蓟马种群的适应性将大大降低，为烟蓟马种群的防治提供了理论依据。
