Desempenho e predação Eriopis connexa (Germar, 1824) (coleoptera: coccinellidae) com diferentes presas e respostas olfativa aos voláteis emitidos por adultos

• Autor(a) principal: Santos, Djison Silvestre dos
• Data de Publicação: 2016
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal de Alagoas (UFAL)
• Texto Completo: http://www.repositorio.ufal.br/handle/riufal/5228
• topic: Coccinelídeos; Predação; Ecologia química; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

Knowledge of the trophic and chemical ecology of predatory insects is quite important because it helps to understand the population dynamics of natural enemies and to improve strategies for their use in the biological control of pests. In this sense, the objective of this work was to study the performance and rate of predation of the Eriopis connexa (Germar, 1824) (Coleoptera: Coccinellidae) on different preys and adult olfactory response of the predator, aiming at the knowledge of intraspecific chemical communication. The studies were conducted at the Entomology Laboratory: alternative pest control and at the Natural Resources Research Laboratory (LPQRN) of the Federal University of Alagoas. The consumption of B. brassicae and A. craccivora aphids by the different stages of E. connexa was determined using prey of three ages: neonatal nymphs; Third instar nymphs and adults at densities of 120, 50 and 50 aphids, respectively. In the functional response bioassay the behavior of fourth instar larvae and adults of E. connexa at densities of 20, 30, 40, 50, 60 and 70 aphids for both prey were evaluated. Ladybugs fed B. brassicae had a longer development time of 15.8 days and larva-adult viability of 36.6%, whereas treatments with A. craccivora and A. kuehniella eggs obtained 13.8 and 13 days and viability Of 76.6 and 80%, respectively. The consumption of nymphs and adults of B. brassicae and A. craccivora aphids by larvae and adults of E. connexa increased with the age of the predator regardless of the age of the prey, nor was there any difference in prey preference among prey species . Regarding the functional response of fourth instar larvae and adults of E. connexa, both presented functional response type II for aphids B. brassicae and A. craccivora with maximum consumption / day, respectively, of 30.3 and 31.8 per larvae And 36.3 and 34.6 per adult. The biological activity of the extracts of the insects (male and female) were verified through analysis of bioassays in double-choice olfactometer in Y. For the behavioral results of E. connexa, it was observed that the highest predominance of copulation occurred between the fourth and fifth day. As for the results of the olfactory response, the insects tested were not attracted to extracts collected by males and females. The results on the biological aspects and predation allows to conclude that the B. brassicae aphid does not present adequate nutritional qualities for a good development of the E. connexa ladybug compared to the A. craccivora aphid. However, larvae and adults of the ladybugs exhibited functional response with increased predation in both aphids. For the olfactory response results no attraction of any extract collected from the insects was observed.