Leaves pointing downward

[kenned]

I'm using a digital pH-meter from milwaukee.
I just calibrated the meter today, and I'm checking it once every day.

Today the pH is 5,4, so I added a little tap water to raise it again..

 

[lynz420]

Hmmm, your meter should be accurate, I wonder if the pH was fluctuating a week or two ago and you are just seeing the results now?
The only other thing I can think of is the early stage of some kind of leaf rust fungus, check out this thread;
http://www.icmag.com/ic/showthread.php?t=70465
Good luck, I hope you can figure out what's going on