<H1>Mechanical Control</H1>
   <P><UL>
   <LI><H2>
   </H2>
   </UL><UL>
   <LI><H2>Plastic or fabric thickness affects the degree of weed suppression.
   </H2>
   </UL><UL>
   <LI><H2>Clear and colored plastics that allow light penetration produce high temperatures in the upper surface.
   </H2>
   </UL><UL>
   <LI><H2>This build up of heat, solarization, kills germinating weed seeds.</H2>
   </UL></P>
   <P><UL>
   Fabric Mulches</UL></P>
   <P></P>
   <P>