Uso do componente florestal em sistemas integrados para permanência de Crisopídeos (Neuroptera : chrysopidae) em Agroecossistemas

Abstract

Lacewings are important predators of pests, but monoculture systems based on annual crops do not give necessary conditions to keep those predators throughout the year in these agroecosystems as consequence of the dry period where there are no crops. Thus, carnivorous insects need to migrate due to the lack of food sources. In this research, we studied whether cropping systems with eucalyptus trees gave source conditions to lacewings keep throughout the year in those systems. The evaluations were conducted in an experiment about croplivestock-forestry integration in a transition zone between Cerrado (Tropical Savana) and Amazon rainforest, in the State of Mato Grosso, Brazil. The collects were dane from June 2013 to September 2014, with fortnightly assessments during the dry period and monthly during the rain period. The methods to collect the herbivorous and lacewings where the yellow stick traps and eucalypt branches. The greatest abundance of herbivorous insects in eucalyptus trees, as well as lacewings, was found during the dry period. Besides, all cropping systems with the forest component allowed the predator’s permanence in the field, in contrast to the monoculture systems of corn and pasture where lacewings were rarely collected.