Meteorological index and forecast method for grasshopper outbreaks in alpine grasslands

Taking Qinghai Province as the research object, the relationship between the primary growth period of grasshoppers and meteorological conditions in grasslands in the mountains and basins of Qinghai Lake was analyzed. The main influencing factors were determined as the average temperature anomaly, percentage precipitation anomaly, and days of snow cover during the winter. The meteorological suitability degree and meteorological risk for the occurrence and development of locusts at different developmental stages were divided into four levels based on the main influencing factors. Subsequently, the meteorological risk grade index and forecast equation for grasshopper outbreak disaster were constructed according to the threshold value of the comprehensive meteorological risk grade.