What are these spots on my clover? It looked good but has developed these spots on the leaves since it has gotten hot.

My durana has started doing the same thing. I'm not sure if it's the heat or lacking soil nutrients, but I'm going to pull a soil sample soon from some of my fields to see.

Looks like downy or powdery mildew from excessive humidity/moisture

Wouldn't that wipe off with a little pressure? I tried that. It seems to be in the leaf. Buy the way this is mostly durina clover.

How tall is it? It can cause it own mildew problems if it gets too tall and starts to smother itself out. BUT don't mow it shorter than about 4" unless it's in shaded areas and/or rain is a sure thing within a day or so. The flip side is when the cool fall weather gets here it will rebound any way.

The field was getting pretty weedy and I was going to spray it but I didn't want to stress it. It was about 5 inches tall. I kept the bush hog high enough to just barely clip the top of the clover and get the weeds.

Not necessarily. Once mildew has set on leaf surface the spores can disappear but still see the evidence of the disease after they're no longer present.

If it is powder mildew, is there anything to do or just let it go and hope it goes away?

I bet its just heat stress.....especially if this happened after you cut the field. It's that time of the year when most clover goes dormant in these parts.

It was on it before I cut it. I did some research on fungicides, but I don't know how much good it would do now. I'll let it sit for a while and see what happens.

Did it seem to get worse after you cut it??? Weeds are actually your friend this time of year in a clover patch. They offer the clover a little protection from the direct sun. Mowing right now almost insures that the clover will go dormant when exposed to August heat and dry weather. It would be better to mow in September when the heat breaks.

I have a bunch of new nuttal oaks planted that I let weeds get grown up around and over take the little oaks during the last few months. Well, when I cut back all the weeds from around them and exposed them to the direct summer heat the other day….several of them started getting stressed and turning from green to looking like they might die. I think they’ll make it but its an example of how the weeds were providing shelter from the intense heat. The trees were not acclimated to it and when I suddenly exposed them after being in partial shade all summer….they got stressed. Same concept with clover this time of year. Keep us updated. I’d be interested to see what the issue turns out to be.