Khan Hafiz Azhar Ali
Institute of Zoology, University of the Punjab, Lahore P.O. Box. 54590, Pakistan.
Toxics. 2023 Dec 19;12(1):2. doi: 10.3390/toxics12010002.
Cyromazine is a triazine insect growth regulator insecticide that is recommended for control of worldwide. Cyromazine is highly effective in causing mortality of ; however, some aspects of its lethal and sublethal effects on the biology of are still unknown. The present study explored lethal and sublethal effects on several biological traits and population parameters of . Concentration-response bioassays of cyromazine against third-instar larvae of exhibited sublethal and lethal effects from concentrations of 0.03 (LC), 0.06 (LC), and 0.14 (LC) μg/g of a larval medium. Exposure of larvae to these concentrations resulted in reduced fecundity, survival, longevity and oviposition period, and delayed development of immature stages (i.e., egg hatch time and larval and pupal durations) in the upcoming generation of . The values of population parameters such as intrinsic rate of increase, finite rate of increase, net reproductive rate, age-specific survival rate and fecundity, and age-stage life expectancy and reproductive value, analyzed using the age-stage and two-sex life table theory, were significantly reduced in a concentration-dependent manner in comparison with the control group. In conclusion, the study highlights the significant effects of cyromazine on the biology of that could help suppress its population in cases of severe infestations.
环丙氨嗪是一种三嗪类昆虫生长调节剂杀虫剂，在全球范围内被推荐用于防治害虫。环丙氨嗪在导致[害虫名称]死亡方面非常有效；然而，其对[害虫名称]生物学的致死和亚致死效应的某些方面仍然未知。本研究探讨了环丙氨嗪对[害虫名称]的几种生物学特性和种群参数的致死和亚致死效应。环丙氨嗪对[害虫名称]三龄幼虫的浓度 - 反应生物测定显示，幼虫培养基浓度为0.03（LC）、0.06（LC）和0.14（LC）μg/g时呈现出亚致死和致死效应。将[害虫名称]幼虫暴露于这些浓度下，导致下一代的繁殖力、存活率、寿命和产卵期降低，以及未成熟阶段（即卵孵化时间、幼虫和蛹期）的发育延迟。使用年龄 - 阶段两性生命表理论分析的种群参数值，如内禀增长率、有限增长率、净繁殖率、年龄特异性存活率和繁殖力，以及年龄 - 阶段预期寿命和繁殖价值，与对照组相比，以浓度依赖的方式显著降低。总之，该研究突出了环丙氨嗪对[害虫名称]生物学的显著影响，这在严重虫害情况下有助于抑制其种群数量。
