I do preventative fungicide, but i live pretty close to the southeastern edge of the transition zone line. For ME, fungal disease is not an IF, but a WHEN... as I hit all 5 of the 4 listed below.
...1. say you have tall fescue 2. night time temps are above 68 degrees 3. humidity is high 4. Leaves are staying wet for extended periods of time 8+ hours a day....
In these conditions listed, it's easier for me to prevent than to combat BP.
However, i do not believe you have an urgent need for preventative fungicide measures.
Maybe this is what also throws me off. The whole transition zone. For instance I saw @Pete1313
doing propocanizol recently and I wonder what am I missing.
Can you link to this post? I can't seem to locate it, but i did see where he said he was NOT doing any preventative's this year.
With that said, I am going to attempt to explain why you might see some people dropping preventative fungicides in the spring. Summer Patch, while symptoms are seen in the summer, actually begins in the spring when soil temps reach 65 degrees. What you are seeing on the surface in the summer is a result of the rooting damage done in the spring from the fungus.
And unless you know you have Summer Patch, then there is no need to worry about this. If you have a disease present, try to identify it first. If you can't ID, post a pic, and see if anyone here can help point you in a good direction.