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\hypersetup{pdftitle={Mechanisms Influencing the Population Dynamics of the Cassava Green Mite Mononychellus Tanajoa (Acari: Tetranychidae) and the Predatory Mite Amblyseius Largoensis (Acari: Phytoseiidae)},pdfauthor={Adenir Teodoro, Adriano Rêgo, Christoph Gehring},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Biological control, Environmental variables, Predatory mites},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
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\begin{center}
\Large{\textbf{Mechanisms Influencing the Population Dynamics of the Cassava Green Mite Mononychellus Tanajoa (Acari: Tetranychidae) and the Predatory Mite Amblyseius Largoensis (Acari: Phytoseiidae)\footnote{\textbf{Contact Address:} Adenir Teodoro, Maranhão State University, Agroecology, Campus Universitário Paulo Vi Po Box 9, 65054-970~São Luís, Brazil, \mbox{e-mail}: \email{adenir.teodoro@pq.cnpq.br}}\\[0.8ex]}}
\normalsize{\textsc{Adenir Teodoro$^{1}$, Adriano Rêgo$^{2}$, Christoph Gehring$^{3}$}}
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\begin{itemize*}
\item[]{\small{\textit{$^{1}$Maranhão State University, Agroecology, Brazil}}}
\item[]{\small{\textit{$^{2}$Maranhão State University, Agroecology, }}}
\item[]{\small{\textit{$^{3}$Maranhão State University, Agroecology, Brazil}}}
\end{itemize*}
\index[author]{Teodoro, Adenir}
\index[author]{Rêgo, Adriano}
\index[author]{Gehring, Christoph}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
The landscape of the Northeastern Brazilian state of Maranhão is dominated by smallholder agriculture. Slash and burn management practices are still used by the majority of local farms to cultivate several crops including cassava (\textit{Manihot esculenta}). The cassava green mite Mononychellus tanajoa is an important pest of cassava and may be kept in check by naturally occurring predatory mites of the family Phytoseiidae. In addition to predatory mites, environmental variables may also contribute to regulate pest populations in the field. All experiments were conducted in four study sites located around the city of Miranda do Norte, Maranhão State, Brazil. We evaluated the population dynamics of M. tanajoa and the most common predatory mite found in the study region, Amblyseius largoensis (Acari: Phytoseiidae), over the cultivation cycle (11 months) of cassava. Moreover, we determined the relative contribution of the abiotic environmental variables (rainfall, temperature and relative humidity) to the abundance of M. tanajoa and A. largoensis. The influence of M. tanajoa and A. largoensis on each other's abundance was also determined. The abundance of M. tanajoa was high and increased whereas the abundance of A. largoensis was low and remained constant throughout time. Hierarchical partitioning analyses revealed that the variance for the abundance of M. tanajoa was explained by rainfall and relative humidity followed by A. largoensis abundance and temperature. Temperature, M. tanajoa abundance and rainfall followed by relative humidity explained the variance for the abundance of A. largoensis. We conclude that the predatory mite A. largoensis may contribute to regulate populations of the cassava green mite in the field. In addition, abiotic environmental variables were the main mechanisms explaining population dynamics of both the pest mite M. tanajoa and the predatory mite A. largoensis. }

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\noindent \textbf{Keywords:} Biological control, Environmental variables, Predatory mites
\index[key]{Biological control}
\index[key]{Environmental!variables}
\index[key]{Predatory mites}
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