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Mythimna sequax
wheat armyworm
Mythimna sequax, commonly known as the wheat armyworm, is a noctuid moth species whose larvae are significant agricultural pests of wheat and other cereals. Native to the Americas, it has become established in southern Brazil where it causes substantial damage to winter wheat crops. The species exhibits nocturnal larval behavior, sheltering under soil debris during daylight hours. Climate change research indicates its voltinism (number of generations per year) is sensitive to temperature increases, with nonlinear phenological models providing more accurate predictions than traditional degree-day approaches.