I can't tell what is attacking my beautiful jade plant, a disease or pests. I will attach a photo. I've never had issues with my plant on the past. Only the leaves are affected. They look half diseased/half eaten. Whatever the issue is, it is not affecting the other succulent plants in the pot, just the Jade plant. Help!

Those wounds could be from snales/slugs or even grasshoppers. Have you noticed any slime-trails?

Welcome to All Things Plants, @emilysexton !

Is your Jade indoors or outdoors? and maybe you could give us an idea of where you live?

My poor Jade tree suffers various forms of mistreatment by me, I'm afraid... but it keeps bouncing back, so they seem to be a VERY forgiving plant.

emilysexton!

I would just remove the diseased looking leaves and throw them away. Jades are good in bouncing back. Just be careful in watering, water at soil level and let it drain well. As long as the trunk and limbs of your Jade are firm to the touch it should be okay. You mentioned there are other succulents in the same container with your jade plant. Can you repot your jade separately? Jades really do well on its own container and can grow into a good specimen size.

Emily,
Can you upload a photo of the entire plant and the container in which it is growing?

That would be helpful.

Here ya go. There's not much left in the pot, as I have rehomed a few succulents that were taking over. The succulent in the background is all that's really left, the stragglers on the right are what's left over from bringing inside during the winter and I am going to propagate them soon. Also ignore my hand, that was there to show the height the other day when I sent the picture to a friend. I'm thinking I will just be more careful about overwatering as many of you have suggested. And I've removed all of the affected leaves. There seem to be no signs of pests, initially at least, but I'll keep a careful eye out. Lastly, the skewers in the picture aren't necessary to hold the plant up, the trunk and limbs are firm and heathy and the plant stands alone. I just put them there to help control the direction of growth.

Oh and I'm in the PNW in terms of climate/pests. But really, maybe I've just been overwatering! I'm sure it's possible. It's been a very, very hot summer and I probably have given them just a little more water than usual.

Watering may be your problem. We are 95-100F every day with a heat index of 110-115F, and I still only water my jade (at most) once a week. All my jade grow in clay pots.

When I water my jades, I just water directly at the root zone/soil level area, not wetting the leaves, and you have to allow the soil to dry out again. I usually do only twice a month deep watering. The plant's trunk and leaves holds water very well, and if it gets to drink more water than it should it will cause leaf edema, appearing like lesions on the leaves and as it ruptures it leaves behind those marks.

So just temper down the watering a bit. My location is extremely dry, and very hot too, but I still provide the intervals in watering.

Thank you guys!

The plant looks very healthy. Probably just dropping the older leaves which is normal as a plant grow. Keep up the good work!
Keep the watering can at the far back corner of the property; you'll have to think twice before filling it to water (or over water) your plants.