Question
a week ago I applied liquid iron to my lawn. the grass was dry but rain came within 12 hours.no results so far. Should I reapply & if so how often, rain factor, and any thing else i should do.

Answer
Dear Mr. Mestler:

Most of the diseases which plague St. Augustine grass have a symptom of yellowing.  If the problem comes from a high pH, then you have done the right thing.  Give the iron a chance to work.  Applying more should not hurt the plants or soil, within reason.  You should be working from a soil analysis to target a pH below 6.0.

With the other problems, there must be a correct diagnosis.  For fungal and viral diseases, a tissue analysis will reveal the culprit.  For pests, a plant/soil analysis will point to an insect.  Most problems are fungal andcan be treated easily, except for fairy rings and mushrooms.

Try this URL for familiarization with St. Augustine problems:
http://plantpathology.tamu.edu/Texlab/Lawns/sagtop.html

I hope this helps.