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Populational dynamics of mites Acari in the mate-tea tree Ilex paraguariensis St Hil aquifollaceae Dinamica populacional de acaros Acari em erva-mate Ilex paraguariensis St Hil Aquifollaceae



Populational dynamics of mites Acari in the mate-tea tree Ilex paraguariensis St Hil aquifollaceae Dinamica populacional de acaros Acari em erva-mate Ilex paraguariensis St Hil Aquifollaceae



Neotropical Entomology. January-February; 351: 101-111



The objective of this research was to analyze the populational dynamic of the phytophagous mites, as well as that of their natural predators in the plants Ilex paraguariensis St. Hil. (Aquifoliaceae). This study was conduced in Dois Vizinhos, State of Parana, from August 2001 to July 2002. Leaf samples from different parts of the plant were taken and the number of mites was registered. During this period, two species of phytophagous mites, Dichopelmus notus Keifer, and Oligonychus yothersi (McGregor), and three species of predator mites identified as Euseius concordis (Chant), Iphiseiodes zuluagai Denmark & Muma, and Agistemus sp. were related to the mate-tea plant. Large numbers of D. notus appeared oil mature leaves and oil the inferior face of leaves. The mite was more frequent in the inferior and medium strata. O. yothersi occurred mainly on mature leaves. The concentration of E. concordis e I. zuluagai was higher on the inferior face of the leaves, and on the leaves of inferior and medium strata, as well as in the internal canopy region, and on mature leaves. The highest numbers of D. notus, O. yothersi, E concordis and I. zuluagai occurred in periods with mild temperatures and little rain precipitation. The largest population density of Agistemus sp. occurred on the inferior face of the leaves, more often in periods of high temperature and heavy rain.

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