Block with out title space in a specific position and certain length (for Title box in a poster)

Question

I am working on a poster. As I need to draw a block in a specific position, I do that using varblock. All of this causes a banner at the top of my title block (see the picture). Is that possible to remove that only for my title box?

Here I include some of my code.

\documentclass[final, 12pt]{beamer}
\usepackage[size=custom,width=77,height=107,scale=1.4,orientation=portrait]{beamerposter} 
\usepackage[english]{babel}
\usepackage[pdftex]{graphicx}
\usepackage{wrapfig,xcolor}
\usepackage{array,booktabs,tabularx,amsthm,multirow,amsmath}
\usepackage[absolute,overlay]{textpos}
\usepackage{mdframed}
\usepackage{tikz}
\usepackage{pifont}
\usepackage{multicol}
\newenvironment<>{varblock}[2][\textwidth]{
  \setlength{\textwidth}{#1}
  \begin{actionenv}#3
    \def\insertblocktitle{#2}
    \par
    \usebeamertemplate{block begin}}
  {\par
    \usebeamertemplate{block end}
  \end{actionenv}}
\usecolortheme{rose}

\begin{document}
\begin{frame}

\begin{textblock}{}[0,0.1](1cm,1cm)
\begin{varblock}[75cm]{}
\vspace{-0.65cm}
\begin{center}
{\Large {\textbf{\textcolor{violet!90}{Anticipated Complexities of Landfill to Estimate Fugitive $\mathrm{CH_{4}}$  using Micro-Meteorological Method.}}}\\
\vspace{0.5cm}
\normalsize {\textbf{ M$^1$, T$^1$, J$^1$, R$^2$}}\\ 
\textcolor {black}  {1.Uof A 2.Agri-Food Canada}}
\end{center}
\end{varblock}
\end{textblock}


\begin{textblock}{50cm}[0,-0.58](1cm,0cm)
\begin{varblock}[35cm]{\textbf{1. Introduction}}

blah blah 


\end{varblock}
\end{textblock}


\begin{textblock}{}[0,-1.4](1cm,0cm)%
\begin{varblock}[31cm]{\textbf{3. Site \& Equipment}}
blah blah 
\end{varblock}
\end{textblock}

\end{frame}
\end{document}

Answer 1

You were using the arguments of textblock in the wrong way (please refer to the textpos package documentation for details). Anyway, your problem is that, according to your definition of varblock, this new block expects a title; for the title of your poster, obviously you don't need this field, so instead of using varblock you can simply use a beamercolorbox with the appropriate color (in this case, the color block body used to typeset the body of ordinary blocks). The code below illustrate this idea; of course, feel free to make the necessary adjustments according to your needs (I wasn't sure about the exact desired position for the blocks):

\documentclass[final, 12pt]{beamer}
\usepackage[size=custom,width=77,height=107,scale=1.4,orientation=portrait]{beamerposter} 
\usepackage[english]{babel}
\usepackage{graphicx}
\usepackage{wrapfig,xcolor}
\usepackage{array,booktabs,tabularx,amsthm,multirow,amsmath}
\usepackage[absolute,overlay]{textpos}
\usepackage{mdframed}
\usepackage{tikz}
\usepackage{pifont}
\usepackage{multicol}

\usecolortheme{rose}

\newenvironment<>{varblock}[2][\textwidth]{
  \setlength{\textwidth}{#1}
  \begin{actionenv}#3
    \def\insertblocktitle{#2}
    \par
    \usebeamertemplate{block begin}}
  {\par
    \usebeamertemplate{block end}
  \end{actionenv}}

\begin{document}

\begin{frame}

\begin{textblock}{}(0.2,1)
\setlength{\textwidth}{75cm}%
\begin{beamercolorbox}{block body}
\vspace{-0.65cm}
\begin{center}
{\Large\textbf{\textcolor{violet!90}{Anticipated Complexities of Landfill to Estimate Fugitive $\mathrm{CH_{4}}$  using Micro-Meteorological Method.}}\\
\vspace{0.5cm}
\normalsize {\textbf{ M$^1$, T$^1$, J$^1$, R$^2$}}\\ 
\textcolor {black}  {1.Uof A 2.Agri-Food Canada}}
\end{center}
\end{beamercolorbox}
\end{textblock}

\begin{textblock}{}(0.28,2.2)
\begin{varblock}[35cm]{\textbf{1. Introduction}}
blah blah 
\end{varblock}
\end{textblock}
\end{frame}

\end{document}