Diversidade e dinâmica populacional de ácaros em pomar cítrico

Abstract

ResumoAs plantas de citros hospedam diversas espécies de ácaros que causam sérios prejuízos à produção e qualidade de frutos no Brasil. Esta pesquisa teve por objetivo estudar a diversidade de ácaros e a dinâmica populacional das principais espécies de ácaros em pomar de citros, Citrus sinensis (L.) Osbeck, localizado no município de Descalvado, Estado Diversity and population dynamics of mites in citrus orchard AbstractThe citrus plants are hosts of several species of mites, which cause severe damage to production and quality of fruits in Brazil. The objective of this research was to study the diversity of mites and population dynamics of the main mite species in a citrus orchard, Citrus sinensis (L.) Osbeck, in Descalvado County, State of São Paulo, Brazil. Fourteen evaluations were conducted over a period of 12 months, from February 2007 to February 2008. At each assessment, ten leaves and five fruits were collected from the inner part of each citrus canopy, from a total of 40 marked plants. Thirty four mite species were found, which were distributed into 17 families. The most abundant species were: Phyllocoptruta oleivora (Ashmed) (Eriophyidae), Panonychus citri (McGregor) (Tetranychidae), Brevipalpus phoenicis (Geijskes) (Tenuipalpidae) and Fungitarsonemus sp. (Tarsonemidae). Among the predators, the Phytoseiidae family presented the highest richness (eight species) and the highest abundance (1,072 individuals). Euseius concordis (Chant) was the predominant species, corresponding to 98.3% of the mites of this family. Significant correlations were observed between the population densities of E. concordis and of the phytophagous mites P. citri, B. phoenicis and P. oleivora. Significant correlations were also observed between population densities of these mites and meteorological factors such as temperature and precipitation. The results indicate that E. concordis acts as a natural enemy of P. citri, B. phoenicis and P. oleivora in the citrus orchard.

Lethal and sublethal effects of pesticides used in Brazilian citrus groves on Panonychus citri (Acari: Tetranychidae)

“…The population density of P. citri throughout the year shows negative correlations with temperature and rainfall variables. Warmer and wetter periods would be unfavorable for mite pests, with the largest population peak observed between June and July -the driest and cold months (SILVA et al, 2012).…”

Spatial distribution of citrus leprosis in the Eastern Amazon

“…Devido à importância do controle dessa doença para a citricultura brasileira, muitos trabalhos vêm sendo desenvolvidos nos últimos anos enfatizando medidas de controle do ácaro vetor e da doença (AMORIM et al, 2006;SILVA;SATO;OLIVEIRA, 2012). Segundo Gyenge, Trumper e Edelstein (1999), para a escolha do melhor critério para o controle de uma praga é necessário o conhecimento da distribuição espacial da população.…”

Efeito de extratos vegetais sobre Brevipalpus yothersi Baker e Brevipalpus papayensis Baker (Acari: Tenuipalpidae) e sobre o ácaro predador Euseius citrifolius Denmark & Muma (Acari: Phytoseiidae)

“…Os ácaros predadores (Phytoseiidae) das espécies Euseius concordis (Chant), Euseius citrifolius (Denmark & Muma) e Iphiseiodes zuluagai Denmark & Muma são os mais frequentes e abundantes nos pomares cítricos brasileiros (SATO et al, 1994;MORAES et al, 2004;SILVA et al, 2012). Sato et al (1994)…”

“…Os resultados demostram elevado potencial de uso dos dois extratos vegetais para o manejo de ácaros fitófagos, principalmente para Brevipalpus spp. devido à sua maior toxicidade aos ácaros-praga que aos ácaros fitoseídeos, que correspondem aos principais inimigos naturas dos ácaros-praga nos cultivos agrícolas McMUURTRY, 1981;SILVA et al, 2012).…”