Hemlock Woolly Adelgid 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. Hemlock woolly adelgid damages hemlock trees by piercing the twig at the base of the needles and sucking sap from the trees. These forecasts are designed to guide researchers and volunteers by providing the timeframe during which to look for each life stage.We forecast eggs in hemlock woolly adelgid (Adelges tsugae) at 26-1000F growing degree days (base 32F, start date: January 1, simple average GDD method). We forecast nymphs in hemlock woolly adelgid at 1001-2200F growing degree days (base 32F, start date: January 1, simple average 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 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.物候预测（Pheno Forecast）地图可预测多种物种的关键生命周期阶段，以优化物种保护与管理成效。针对昆虫害虫类群，物候预测基于已发表的、对应物种生命周期关键节点的生长度日（growing degree day, GDD）阈值。此类关键节点通常对应管理措施实施效果最佳的生命周期阶段。铁杉球蚜（Hemlock woolly adelgid）通过刺吸针叶基部嫩枝汁液危害铁杉林木。该预测工具旨在为研究人员与志愿者提供各生命周期阶段的观测窗口期，以指导相关监测与管理工作。针对铁杉球蚜（Adelges tsugae）的卵期预测，基于26~1000华氏度的生长度日阈值（基准温度32华氏度，起始日期为1月1日，采用简单平均积温法）。针对该虫的若虫期预测，则基于1001~2200华氏度的生长度日阈值（基准温度32华氏度，起始日期为1月1日，采用简单平均积温法）。此类预测地图每日更新，并可查询未来6天的预测结果。美国国家物候网（USA-NPN）可视化工具（https://www.usanpn.org/data/visualizations）可获取当前年度与上一年度的预测数据。若需咨询该数据集相关事宜，请联系美国国家物候网（USA-NPN）。本数据集需遵循美国国家物候网（USA-NPN）数据使用政策。