Population dynamics of the Gyropsylla spegazziniana (Lizer y Trelles) (Hemiptera, Psyllidae) and your natural enemies in planted 'ervais', in the municipal district of Sao Mateus do Sul, PR, Brazil

摘要

Population dynamics of the Gyropsylla spegazziniana (Lizer y Trelles) (Hemiptera, Psyllidae) and your natural enemies in planted "ervais", in the municipal district of Sao Mateus do Sul, PR, Brazil. Gyropsylla spegazziniana (Lizer & Trelles, 1919) is considered to be one of the principal pests of "erva-mate" (Ilex paraguariensis) plantations, but little is known about the density of its population and their natural enemies along the year. The objective of the present research is to study the population dynamics of the pest as well as its natural enemies, aiming to define the best moment for its control. To measure pest population dynamics, ten "Gyrotrap (R)" traps were installed an area of 0.5 ha of "erva-mate" plantation in Sao Mateus do Sul, Pr. Brasil. G spegazziniana was found to be present throughout the year, with population growth highest in the beginning and middle of spring, and peaks between October and April. To survey natural enemies of the pest species, collections were made every two weeks in the plantations, using an aluminum funnel. Predators and a species of parasitoids were the natural enemies associated to the culture. They also showed synchronism with the peak occurrence of the pest.