A Phenology Model for Asian Gypsy Moth Egg Hatch

Area of Science:

• Ecology
• Entomology
• Invasive Species Management

Background:

• Phenology models aid pest management, biosecurity, and range shift predictions.
• The Gypsy Moth Life Stage (GLS) model predicts North American gypsy moth spread but lacks parameters for the Asian subspecies.
• Differences in temperature requirements for egg hatch exist between North American and Asian gypsy moth phenotypes.

Purpose of the Study:

• To determine the effect of temperature and exposure duration on Asian gypsy moth egg hatch timing.
• To develop and present specific phenology model parameters for the Asian gypsy moth phenotype.
• To improve the accuracy of predicting Asian gypsy moth egg hatch for management and invasive range assessments.

Main Methods:

• Investigated the impact of varying temperatures and exposure durations on Asian gypsy moth egg hatch.
• Collected data on the timing of median egg hatch under different experimental conditions.
• Developed new phenology model parameters based on experimental results for the Asian phenotype.

Main Results:

• The new model parameters significantly reduced the sum of squared differences from 7,818 d² to 178 d² compared to North American parameters.
• Simulated median egg hatch days differed from observed days by an average of 0.2 days (SD=3.1), ranging from 0-7 days.
• The simulated egg hatch pattern closely matched the observed irregular pattern under experimental temperature regimes.

Conclusions:

• The developed phenology model parameters provide accurate predictions of Asian gypsy moth egg hatch.
• Accurate egg hatch prediction is vital for gypsy moth population suppression, eradication, and invasive range estimation.
• These findings support improved biosecurity and pest management strategies for the invasive Asian gypsy moth.