In order to verify the grasshopper population dynamics in the National Forest of Chapecó, SC., weekly collections were made between December 2003 and December 2004, using pit-fall traps, sweep nets, entomological umbrellas and malaises traps. The population peaks for most of the species was reached in December, January and February. The regression analysis (5%) showed significant relation between the climatic factors and the population levels of Allotruxalis gracilis (Giglio-Tos, 1897), Parorphula graminea Bruner, 1900, Rhammatocerus brunneri (Giglio – Tos, 1895) and Xyleus discoideus discoideus (Serville, 1831).
population levels; Orthoptera; Acridoidea; Tetrigoidea; Tridactyloidea
