Neotropical Entomology (2006) 35, 101-111

Alfredo de Gouvea, Luiz C. Boaretto, Carla F. Zanella and Luis F.A. Alves (2006)
Dinâmica populacional de ácaros (Acari) em erva-mate (Ilex paraguariensis St. Hil.: Aquifoliaceae)
[Populational dynamics of mites (Acari) in the mate-tea tree (Ilex paraguariensis St. Hil.: Aquifoliaceae)]
Neotropical Entomology 35 (1), 101-111
Abstract: 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 Paraná, 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 and Muma, and Agistemus sp. were related to the mate-tea plant. Large numbers of D. notus appeared on mature leaves and on 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 and 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.

Este trabalho foi realizado em Dois Vizinhos, PR, com o objetivo de estudar a dinâmica populacional de ácaros fitófagos e seus predadores em plantas de erva-mate (Ilex paraguariensis St. Hil. Aquifoliaceae). Folhas de diferentes partes da planta foram coletadas de agosto de 2001 a julho de 2002, e os ácaros presentes foram contados sob microscópio estereoscópico. Foram encontradas associadas às plantas de erva-mate duas espécies de ácaros fitófagos Dichopelmus notus Keifer, e Oligonychus yothersi (McGregor), e três espécies de predadores identificados como sendo Euseius concordis (Chant), Iphiseiodes zuluagai Denmark and Muma e Agistemus sp. O ácaro D. notus ocorreu em maior número na face inferior de folhas, em folhas maduras e em folhas dos estratos inferior e médio. O. yothersi predominou em folhas maduras. A concentração de E. concordis e I. zuluagai sempre foi maior na face inferior de folhas, em folhas maduras, em folhas dos estratos inferior e médio e na região interna da copa. Os ácaros D. notus, O. yothersi, E. concordis e I. zuluagai tiveram picos populacionais em período de temperatura amena e baixa precipitação pluviométrica. A maior densidade populacional de Agistemus sp. ocorreu na face inferior das folhas e seu pico populacional ocorreu em período de alta temperatura e precipitação pluviométrica elevada.
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(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
environment - cropping system/rotation
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Dichopelmus notus	Ilex (crop)	Brazil (south)
	Oligonychus yothersi	Ilex (crop)	Brazil (south)
Euseius concordis (predator)			Brazil (south)
Iphiseiodes zuluagai (predator)			Brazil (south)