背景:卵寄生虫是农作物鳞翅目害虫的重要生物防治剂。EvanescensWestwood和T.pintoiVoegele(膜翅目:Trichogrammatidae)是具有全球重要性的卵寄生虫。寄生虫的选择需要对生命表特征和功能响应分析进行比较评估,以了解其在害虫控制中的有效性。在这项研究中,我们检查了他们的生命表特征,包括存活率和繁殖能力,和功能响应和相关参数,即,攻击系数和处理时间。
结果:寿命表参数,使用年龄阶段,两性理论,揭示了两个物种相似的生存和繁殖策略。例如,女性长寿,两个物种的产卵天数和繁殖力没有差异。例外地,依文丝虫的雄性寿命短于品脱丝虫。人口增长参数,如毛繁殖率(GRR),净繁殖率(R0),内在增长率(r),有限增长率(λ),平均世代时间(T)在物种之间没有差异。多项式逻辑回归产生了III型功能响应,非线性最小二乘分析显示了不同的攻击系数和相似的处理时间。然而,它们的寄生率在最低(五个卵)和最高(80个卵)初始寄主卵密度之间存在差异,因此,伊瓦那虫草在最低密度下的寄生率较低,在最高密度下的寄生率较高。
结论:讨论了两种寄生虫的生存策略的相似性和宿主处理的微小差异与应用生物防治应用和进化特征的相关性。©2024作者(S)。害虫管理科学由JohnWiley&SonsLtd代表化学工业学会出版。
BACKGROUND: Egg parasitoids are important biological control agents of lepidopteran pests of agricultural crops. Trichogramma evanescens Westwood and T. pintoi Voegele (Hymenoptera: Trichogrammatidae) are egg parasitoids with worldwide importance. The parasitoid selection necessitates comparative assessment of the life table traits and functional response analysis to provide insights into their effectiveness in pest control. In this study, we examined their life table traits including survivorship and reproductivity, and functional response and associated parameters i.e., attack coefficient and handling time.
RESULTS: Life table parameters, using age-stage, two-sex theory, revealed similar survival and reproductive strategies for both species. For example, the female longevity, oviposition days and fecundity did not differ between both species. Exceptionally, the male longevity of T. evanescens was shorter than that of T. pintoi. The population growth parameters such as gross reproductive rate (GRR), net reproductive rate (R0), intrinsic rate of increase (r), finite rate of increase (λ), and mean generation time (T) did not differ between species. The polynomial logistic regression yielded a type III functional response and a non-linear least square analysis revealed different attack coefficient and similar handling time. However, their parasitism rate differed between the lowest (five eggs) and highest (80 eggs) initial host egg densities such that T. evanescens had a lower parasitism rate at the lowest density and higher parasitism rate at the highest density.
CONCLUSIONS: The similarity in survival strategies and minor differences in host handling of both parasitoids are discussed in terms of relevance to applied biological control applications and evolutionary traits. © 2024 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.