\documentclass[english,german]{scrartcl}
\usepackage[latin1]{inputenc}
\usepackage{geometry}
\geometry{verbose,a4paper,tmargin=1.75cm,bmargin=2cm,lmargin=2cm,rmargin=2cm,headheight=0.8cm,headsep=0.5cm,footskip=0.5cm}
\usepackage{babel}
\usepackage{url}
\urlstyle{same}
\newcommand\email{\begingroup \urlstyle{same}\Url}\usepackage{graphicx}
\usepackage{units}
\usepackage{tabularx}
\usepackage{wasysym} % enable use of \permil instead of \textperthousand
\usepackage{marvosym}
\usepackage{arabtex}
\usepackage{hyphenat}
\usepackage{booktabs}
\usepackage{mdwlist}
\renewcommand{\thefootnote}{\relax}
\usepackage{index}
\newindex{key}{kdx}{knd}{Keywords}
\newindex{author}{idx}{ind}{Authors}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\fancyfoot{}
\usepackage{ifpdf}
\ifpdf
%\usepackage[activate]{pdfcprot}
%\usepackage[owner=Tapioka, print=true, copy=true, edit=false, annotate=false,set]{pdfcrypt}
%encryption: not supported any more (since pdftex 1.10)
\usepackage[pdftex]{thumbpdf}
\usepackage[pdftex]{hyperref}
\hypersetup{pdftitle={Symptoms of \textit{Fusarium proliferatum} on Maize Leaves},pdfauthor={Thi Thanh Xuan Nguyen},pdfsubject={Tropentag 2011: Abstract},pdfkeywords={Fusarium proliferatum, maize leaves, symptoms},pdfpagemode=None,colorlinks=true}
\else
\usepackage{ae}
\usepackage{textcomp}
\fi
\begin{document}
\ifpdf
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2011.jpg}}}
\else
\parbox[b]{2.5cm}{\resizebox*{2.5cm}{!}{\includegraphics{dtt2011.eps}}}
\fi
\hfill
\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, October 5-7, 2011, Bonn}}\\[1ex] \Large{``Development on the margin''\\[2ex]}}
\hspace{0.1cm}
\begin{center}
\Large{\textbf{Symptoms of \textit{Fusarium proliferatum} on Maize Leaves\footnote{\textbf{Contact Address:} Thi Thanh Xuan Nguyen, Bonn University, Institute of Crop Science and Resource Conservation, Phytomedicine, Nussallee 9, 53115~Bonn, Germany, \mbox{e-mail}: \email{xuan@uni-bonn.de}}\\[0.8ex]}}
\normalsize{\textsc{Thi Thanh Xuan Nguyen}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{Bonn University, Institute of Crop Science and Resource Conservation, Phytomedicine, Germany}}}
\end{itemize*}
\index[author]{Nguyen, Thi Thanh Xuan}
\begin{center}
\vspace{1.1cm}
\textbf{Abstract}
\begin{abstract}
\normalsize{
Maize (\textit{Zea mays}) is an important food crop and a well"=known host of\textit{ Fusarium} species.  Some of these including\textit{ F. proliferatum} are capable of producing large quantities of mycotoxins that are harmful to humans. Different \textit{Fusarium} species have been isolated from maize showing typical rot symptoms at ears or stems. However, no report is available on the symptom development of \textit{Fusarium}  spp. on maize leaves, especially for \textit{F. proliferatum} producing fumonisin. Maize plants, cultivar Tassilo, were grown under two different light intensities and durations of 5800--6000 lux, \mbox{9\,hours\,per\,day} and 18000--20000 lux, \mbox{15\,hours\,per\,day} under climate chamber condition. The plants were inoculated by hand spraying the leaves at BBCH 13--15. Data on disease incidence (\textit{i.e.} the proportion of symptomatic plants within a sampling unit) and re"=isolation frequency (\textit{i.e.} the proportion of the leaf tissues colonized by \textit{F. proliferatum}) were collected. For microbial initiation, symptomatic and asymptomatic leaves were incubated on CZID media. Disease incidence of \textit{F. proliferatum} was \mbox{40\,\%}. Re"=isolation frequency from leaves with symptoms was higher than from asymptomatic leaves, with a colonisation frequency of \mbox{100\,\%} and \mbox{63\,\%}, respectively. Heavy symptoms of \textit{F. proliferatum }appeared on young leaves emerging from the whorl from 7 days after inoculation. Holes were present in the emerging leaves or folded leaves were rotten. Mild symptoms including white- or brown- round or oval spots were observed on upper leaves. On old leaves, the symptoms appeared later and less severity with brown or yellow lesion ranging from 0.5 to \mbox{2.5\,cm} in length and mostly at the leaf edges. The same symptoms of \textit{F. proliferatum} were also detected in the green house during winter with low light conditions. This indicates that the symptoms of \textit{F. proliferatum }appear on maize leaves under less ideal condition of plant growth.}

\vspace{0.5cm}
\end{abstract}
\end{center}
\noindent \textbf{Keywords:} Fusarium proliferatum, maize leaves, symptoms
\index[key]{Maize!Fusarium@\textit{Fusarium} spp.}
\end{document}