Developmental rate estimation and life table analysis for Halyomorpha halys (Hemiptera: Pentatomidae)

No prior work had resolved the precise thermal requirements for the invasive brown marmorated stink bug across its full lifecycle. That uncertainty drove researchers to investigate how environmental heat influences maturation and population growth. Prior research has shown that temperature dictates the survival and spread of many hemipteran species. This gap motivated a detailed assessment of developmental rates under controlled laboratory conditions. It was already known that this pest poses significant threats to various crops in North America. Scientists needed to quantify the specific heat units required for egg and nymphal maturation. Understanding these biological constraints remains vital for predicting the expansion of this insect into new geographic regions. This study addresses these needs by providing empirical data on thermal thresholds and reproductive potential.

The aim of this study is to estimate developmental rates and analyze life tables for the invasive brown marmorated stink bug. Researchers sought to quantify how constant temperatures influence the growth of this pest. This work addresses the need to understand the thermal limits of a species recently introduced to North America. The investigation focuses on identifying the heat units required for successful maturation from egg to adult. Scientists also aimed to evaluate reproductive parameters to better predict population dynamics. Determining these biological thresholds is essential for assessing the risk of further geographic expansion. The study compares different mathematical models to find the most accurate way to represent these developmental relationships. This effort provides the necessary data to forecast how environmental warming might affect the frequency of generations in this insect.

Review approach involved assessing development at seven constant temperatures ranging from 15 to 35 degrees Celsius. Researchers monitored egg and nymphal growth to determine the limits of maturation. The team evaluated three distinct mathematical models to describe the relationship between heat and growth rates. Review approach utilized the Briere-1 model to identify the most accurate fit for the collected empirical observations. Scientists calculated the degree-day requirements for total development from the egg stage to imaginal ecdysis. Review approach included measuring reproductive parameters at a constant 25 degrees Celsius. The investigators recorded the number of eggs per mass and the frequency of oviposition intervals. Review approach synthesized these metrics to estimate the potential for population expansion across different geographic zones.

Key findings from the literature demonstrate that the Briere-1 model offers the most precise fit for egg and total development data. The linear degree-day model indicates that 537.63 degree-days are required for the insect to reach adulthood. Key findings from the literature show that an additional 147.65 degree-days are needed for the female preoviposition phase. The data reveal that egg hatch occurs at 15 degrees Celsius, while full maturation requires temperatures between 17 and 33 degrees Celsius. Key findings from the literature establish that females produce a median of 28 eggs per mass at 25 degrees Celsius. Oviposition occurs at intervals of 4.32 days throughout the female lifespan. Key findings from the literature confirm that the species is currently univoltine in New Jersey and Pennsylvania. The results suggest that warmer climates could support multiple generations per year for this pest.

Synthesis and implications indicate that the Briere-1 model provides the most accurate fit for predicting developmental rates across the tested thermal range. The authors suggest that this model offers reliable estimates for temperature thresholds in this species. Synthesis and implications show that the insect requires 537.63 degree-days to complete its full maturation from egg to adult. The findings imply that an additional 147.65 degree-days are necessary for the preoviposition phase in females. Synthesis and implications reveal that females produce a median of 28 eggs per mass at 25 degrees Celsius. The researchers propose that the current univoltine lifecycle in northern states could shift if the pest reaches warmer climates. Synthesis and implications highlight the risk of multiple annual generations in regions with higher average temperatures. The authors conclude that thermal modeling is a powerful tool for forecasting the future distribution of this agricultural threat.