Research progress on economic and ecological threshold of grassland locust control

Since the 21st century， grassland locust plague has occurred successive years in China, which has threatened animal husbandry development and north ecological security seriously. The study on the economic and the ecological threshold which offers the decision basis for locust control is one of the important research subjects in grassland plant protection field. The concept and theory of economic and ecological threshold for pest control were reviewed and discussed. The research progress on economic and ecological threshold of locust control and the relation of two thresholds in practical application in China was summarized and analyzed. At present, lacks of the systematic and sustained research in this area lead to ineffective direction about the complex situation of locust plague in China. Therefore, some suggestions were put forward for the future research.