Research device for migratory insect field occurrence damage and research method for overwintering populations of spodoptera frugiperda

The invention discloses a research device for migratory insect field occurrence damage and a research method for overwintering populations of spodoptera frugiperda. The top ends of transverse and vertical supports of the device are fixed to form a shed frame, gauze is arranged at the periphery and the top of the shed frame, an openable and/or transparent observation window is arranged on the gauzeat the periphery of the shed frame, and a sealing door is arranged on the gauze at the periphery of the shed frame. The method comprises the steps that same-field comparison is adopted, a mesh enclosure method is adopted for reseeding corn and combining winter vacancy and open-field planting and winter vacancy to form four kinds of treatment; the research device is set; for A treatment, corn is planted at intervals; test point and host crop planting information and meteorological data are collected; occurrence conditions of adults, egg masses and larvae treated in A and B are investigated, and overwintering pupa cond