Sunflower insect damage?

I've noticed some black ants congregating around the base and stems of my big sunflower plant. Also noticed some holes in the stems... anyone know what may be causing the damage? or what the best course of action would be?? Thanks
--------------------------------- --- -- -
Posted with NewsLeecher v3.9 Final
  Click to see the full signature.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Site Timeline is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.