I have a giant watermelon plant, that was doing reply well, until about 2ish weeks ago. Around that time, some of the older leaves started turning light brown around the edges.
I wasn't to worried at first, as I thought it was sunburn. So I erected a shade cover, on the hoops I had for its hoophouse, with a thin sheet. It looks the same as before, except, even more leaves were dying.
Then I thought maybe it was too little sun. We had had a few cloudy days before I noticed it, and afterwards, I had shaded it. So, I took off the shade cover. It still continued to die off, and didn't look good.
I then thought maybe, one of my fertilizer applications had gotten on the leaves, and burned them. So I had stopped fertilizing for a while. It did not help.
Once the leaves turned light brown, theu would fall over and die, however, they were still brittle and not floppy.
Could anyone tell me what's going on?