Well since no on was replying here I looked else where and found this...I thought I'd post it in cause anyone else is having the same issue...
"You probably have corn aphids and the ants are there to harvest their honeydo (waste). You don't say what the "anti-pest vegetable spray" is, but insecticidal soap will work on aphids and would be one of the safest products I can think of for edibles. There are also other insects that will help control aphids in the garden. Take a look here for pics and other helpful info.
http://www.ipm.ucdavis.edu/PMG/r113300611.html
The best way to prevent pests is to maintain plant health. Compost added to the soil before planting and used as a topdressing is helpful. You can also make a compost tea to spray on the foilage.
http://faq.gardenweb.com/faq/lists/soil/2000052708003930.html "
If you are very careful, and can see the aphids, you can spray directly on them with a squirt bottle.
http://www.care2.com/channels/solutions/outdoors/194
I think if the aphids are gone, so are the ants. The only ant to plant relationship I can think of that's positive is the peony. Generally if you see ants on your plants (goodness, that rhymes!) they are harvesting the waste material of aphids or scales and defending against the predators of the aphids or scale.
Btw, there are cornfield ants that protect and nurture aphids that eat the roots of corn and thief ants that eat the seeds!
http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?publicationId=511
This is a wonderful site.
http://www.extension.iastate.edu/pages/hancock/agriculture/corn/diagnostic/corn_diagnostic.html
Insecticidal Soap Spray
1 to 2 tablespoons liquid soap
1 quart water
Combine ingredients in a bucket, mix, then transfer to a spray
bottle as needed.