While on the August Volunteer Naturalist Training at Wildwood (the "Kim Walk"), I saw something yellow on a Horseweed plant. Kim saw me looking at it and came over. After taking a picture and enlarging it on a camera, she thought it might me Ladybug eggs. That evening I looked up ladybug eggs and they certainly do look like it to me. Look at the pictures below and compare them to those shown in these links. The 2nd link is a long video of a ladybug laying eggs, scroll ahead to about 2/3 of the way through if you want a better shot of the eggs.
http://readmore-webphemera.blogspot.com/2008/11/weird-life-cycle-of-ladybug.html
http://www.youtube.com/watch?v=9WdQvAxcxzA
http://readmore-webphemera.blogspot.com/2008/11/weird-life-cycle-of-ladybug.html
http://www.youtube.com/watch?v=9WdQvAxcxzA