Compatibilidade da combinação de Doru luteipes (Dermaptera, Forficulidae) e Orius insidiosus (Hemiptera, Anthocoridae) para regulação de tripes-praga (Thysanoptera: Thripidae)

Abstract

Some species of thrips (Thysanoptera) are considered pest of economic significance crop, but in ornamentals plants are considered key pests for cause direct damage to the tissues of flowers and leaves, making it impossible to commercialization. Also, some species have the habit of sheltering inside flower buds, leaf armpits and flowers which compromises the efficiency of chemical control, but opens the possibility for the use of other strategies, such as biological control. Piratebug of the family Anthocoridae, especially Orius insidiosus (Hemiptera, Anthocoridae) are recognized as effective predators of thrips in open and protected crops. In contrast, Doru luteipes (Dermaptera, Forficulidae) is a voracious predator of pest arthropods in maize, but also prefers to be hidden in plant structures during the day, making it a potential predator of thrips. Because they occupy the same habitat, feed on plant resources such as pollen and present prey in common, O. insidiosus and D. luteipes are considered to be promising biological control agents for thrips. The objective of this study was to evaluate the predatory capacity of D. luteipes and O. insidiosus when exposed to Caliothrips phaseoli (Thysanoptera, Thripidae) and from behavioral and food preference tests to evaluate the compatibility of the two species for regulation of thrips. Also, to prove the effectiveness of D. luteipes as a predator of thrips, the predator was released in an anthurium crop for the regulation of Chaetanaphothrips orchidii (Thysanoptera, Thripidae), a pest species that inhabits inside of closed anthurium flower rand favors the shelter of D. luteipes during the day. It was possible to prove the consumption of thrips by adults and nymphs of D. luteipes, which proved to be voracious by consuming in the adult stage approximately 210 thrips in 24 hours, six times higher than that consumed by adults of O. insidiosus (32,4). The results obtained provide subsidies for the association of the two species of predators, because in addition to predating thrips at different times, D. luteipes at night and O. insidiosus during the day, do not compete for prey (absence of intraguild predation) and they can survive in the area feeding on pollen when the prey is scarce or absent. This work constitutes the first report of the predation of thrips by Dermaptera, which associated with the release of D. luteipes in the cultivation of anthurium proves its effectiveness with predator. The reduction of the C. orchidii population and the increased density of D. luteipes in the area are indicative of the survival and multiplication of the predator. Thus, early maintenance of the two predators in the areas is the key point to contain the initial thrips infestations and to improve biological control.