Spongy Moth Pheno Forecast, Contiguous United States, Current Year and Prior Year

Pheno Forecast maps predict key life cycle stages in a range of species to improve conservation and management outcomes. For insect pest species, Pheno Forecasts are based on published growing degree day (GDD) thresholds for key points in species life cycles. These key points typically represent life cycle stages when management actions are most effective. Spongy moth egg masses hatch in late spring and the caterpillars feed extensively on many types of trees. Certain control measures are most effective when caterpillars have recently emerged from their egg masses.

We forecast caterpillar emergence in spongy moth (Lymantria dispar) at 571F growing degree days (base 37.5F, upper threshold 104F, start date: January 1, double sine GDD method). These maps are updated daily and available 6 days in the future.

Forecasts are available for the current and prior year in the USA-NPN Visualization Tool (https://www.usanpn.org/data/visualizations).

For all inquiries regarding this dataset, please contact the USA-NPN. This data is subject to the USA-NPN's Data Use Policy.