Levantamento populacional de predadores (Arthropoda) em cultivo orgânico de goiaba (Psidium guajava L.).

Abstract

Resumo -O conhecimento sobre as populações de inimigos naturais que habitam naturalmente o agroecossistema é considerado importante ferramenta para estabelecer estratégias relacionadas à conservação e multiplicação destes organismos. Neste contexto, os objetivos da pesquisa foram registrar e estudar a dinâmica populacional de predadores (Arthropoda) presentes nas copas das plantas de pomar orgânico de goiaba, e correlacionar a flutuação populacional dos principais agentes de controle biológico constatados com os elementos meteorológicos temperatura (°C), umidade relativa média (%) e precipitação pluviométrica acumulada (mm). A pesquisa foi conduzida entre março de 2010 e março de 2011 em um pomar orgânico de goiaba do cultivar Pedro Sato, localizado no município de Fernando Prestes, SP. Os inimigos naturais foram monitorados com cinco armadilhas adesivas amarelas, mantidas no campo por 15 dias, sendo imediatamente substituídas por novas. Para obtenção da análise faunística foram calculados os índices dominância, abundância, frequência e constância. Para correlacionar as populações amostradas com os elementos meteorológicos foram calculados os coeficientes de correlação linear simples (r). Scymnus spp. (Coleoptera: Coccinellidae) foi considerado o inimigo natural com maior ocorrência no pomar orgânico de goiaba, com 91,81% do total de indivíduos amostrados, seguido pelos artrópodes da classe Arachnida (4,41%) e da família Chrysopidae (2,19%). Scymnus spp. e os artrópodes da classe Arachnida apresentam população super dominante em pomar orgânico de goiaba. Polybia sp. e a família Chrysopidae caracterizam população dominante. A umidade relativa influencia inversamente na densidade populacional de Polybia sp., não sendo observada correlação entre os demais elementos meteorológicos e os predadores amostrados. Palavras-chave -Controle biológico. Elementos meteorológicos. Flutuação populacional. Índices faunísticos. Manejo integrado de pragas.Abstract -Knowledge about populations of natural enemies that inhabit naturally the agroecosystem is considered an important toll to develop strategies to conservation and multiplication of these organisms. The objectives of this research were record and study the population dynamics of predators (Arthropoda) related to the canopy of an organic orchard of guava (Psidium guajava L.) and correlate the fluctuation population of the main biological control agents with the meteorological elements temperature (°C), relative humidity (%) and pluviometric precipitation (mm). The research was conducted between March 2010 and March 2011 in organic orchard of guava cv. Pedro Sato, located in Fernando Prestes, SP. The natural enemies were monitored with five yellow stick traps, maintained for 15 days in field and immediately replaced by new traps. To obtain faunistic analyzes we calculated dominance, abundance, frequency and constancy indices. To correlate the sampled populations with meteorological elements we calculated the simple linear correlation coefficients (r). Scymnus spp. (Coleopter...

New records of thrips species on mango and natural enemies associated

“…The occurrence of F. gardeniae was reported in citrus, guava, soybean, grape and avocado (HODDLE et al, 2002;CAVALLERI et al, 2006;LIMA et al, 2013a;MOREIRA et., 2014). Haplothrips gowdeyi was recorded in nectarine flower, bean, soybean, fava, rice, coffee and watermelon (HICKEL;DUCROQUET 1998;LIMA et al, 2013b;COSTA et al, 2015). Frankliniella gemina has already been reported in rose bush, grape and various ornamental plants (MOREIRA et al, 2014).…”

“…In Brazil, information about thrips and natural enemies associated with this plant is still scarce . The knowledge about the organisms that occur in the mango culture is of fundamental importance for the establishment of integrated pest management programs, as it enables the identification of pest insects and natural enemies, and contributes to the understanding of the relationships among species in the agroecosystem (DUARTE et al, 2013). Therefore, this study aimed to report the occurrence of thrips species associated with inflorescence malformation in mango trees and their natural enemies.…”

Occurrence of Conotrachelus psidii (Marshall, 1922) in Psidium cattleianum (Sabine)

“…Biological control through the release of parasitoids and predators has been studied, as well as the cultural control, accomplished by manual harvesting and destruction of fallen fruits (Gallo et al, 2002;Duarte et al, 2013).…”

“…Due to the lack of chemicals registered to control the guava weevil (Brasil, 2016), understanding the biology and ecology of this insect is important for the development of alternative methods of control. Biological control, involving the release of parasitoids and predators, has been studied, as well as cultural control, such as manual scavenging and destruction of fallen fruit (Gallo et al, 2002;Duarte et al, 2013).…”