Abstract Recent invasion of a new haplotype of sugarcane aphid (Melanaphis sacchari Zehntner) resulted in severe outbreaks of the aphids in sorghum (Sorghum bicolor L. Moench [Poales: Poaceae]) across the United States. Previous research and field observations suggested that both sorghum resistance and growth stage were important to their population dynamics in the field and hence effective and timely management to minimize economic losses associated with this pest.To explore this, we designed greenhouse experiments to quantify fecundity, prereproductive period, and longevity of sugarcane aphids across several vegetative and reproductive growth stages of a resistant (DKS 37-07) and susceptible (M77GB52 and DKS 38–88) sorghum hybrids commonly used in sorghum production. We found significant effects of sorghum resistance and growth stage on several life history traits and demographics parameters of sugarcane aphids. We did not, however, note any significant interactive effects of resistance and phenology on any of the response variables. Sugarcane aphids exposed to the susceptible sorghum produced significantly more offspring, had significantly greater intrinsic and finite rates of increase, and significantly shorter population doubling time than the aphids feeding on resistant sorghum. On the other hand, the impact of sorghum growth stage had more variable effects on life history of sugarcane aphids that were most frequently evident at the late reproductive stages. These outcomes support our hypothesis that sorghum in late stages of growth tends to be a better host for sugarcane aphids and highlight the importance of sorghum growth stage to sugarcane aphid life history and population growth potential.

中文翻译：

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高粱生长期和抗性对甘蔗蚜虫（半翅目：蚜科）生活史的影响

摘要 最近入侵的甘蔗蚜虫（Melanaphis sacchari Zehntner）新单倍型导致美国高粱（Sorghum bicolor L. Moench [Poales: Poaceae]）蚜虫的严重爆发。先前的研究和田间观察表明，高粱抗性和生长阶段对其在田间的种群动态很重要，因此有效和及时的管理可以最大限度地减少与这种害虫相关的经济损失。为了探索这一点，我们设计了温室实验来量化繁殖力、繁殖前高粱生产中常用的抗性（DKS 37-07）和易感（M77GB52 和 DKS 38-88）高粱杂种的几个营养和生殖生长阶段的甘蔗蚜虫的寿命和寿命。我们发现高粱抗性和生长阶段对甘蔗蚜虫的几种生活史特征和人口统计学参数有显着影响。然而，我们没有注意到抗性和物候学对任何响应变量的任何显着交互影响。与以抗性高粱为食的蚜虫相比，暴露于易感高粱的甘蔗蚜虫产生的后代明显更多，具有明显更高的内在和有限增长率，并且种群倍增时间明显更短。另一方面，高粱生长阶段的影响对甘蔗蚜虫的生活史有更多的可变影响，这些影响在生殖后期最为明显。