Would like to know if we are overwatering, if this is evidence of a disease, or some other problem?
Unfortunately, your photo did not come through. I am unable to identify the problem.
If you suspect overwatering, then it is likely the case. This can cause many diseases. I would treat with a fungicide, and water only when the soil is completely dry down to about 2 or 3 inches.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/growing-fuchsia-flower.htm
Large and bloomed well. On west side of house under cover and mostly sheltered from direct sun and weather.
Love fuchsias! I didn't find any research that said they needed acidic soil. Rather, a good, well draining potting mix. They are heavy feeders and you can use an 18-18-18 fertilizer at 1/2 strength once a week.
https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/growing-fuchsia-flower.htm
My beautiful potted( with three drainage holes) fuchsia plant of 5 months, which has given me beautiful blooms back to back, is now,- despite watering every other to sometimes daily now that this hot, humid summer has begun-, now turning sparse with the leaves turning brown and brittle dry. Please advise
Fuschsia prefers cool temperatures so they do great in spring and early summer. Once the summer warms up, things get dicey. Do you have your plant hanging under a tree where it will be cooler? Also, are you regularly fertilizing? I would guess the heat is getting to it. I usually plan on replacing mine when the summer heat takes its toll, but mine is still doing well under a tree, although we've seen temps in the 90s. If there is no respite from the heat there, I would just plan on replacing it with a heat-loving plant.
https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/growing-fuchsia-flower.htm
Thank you for the reply to my Fuchsia question. I'm wondering though, when you say replace-do you mean get rid of my plant or just move it to a possibly better liked area, fertilize and help it regain its strength?
You can try moving it to a cooler area if you have one, such as under a tree, and fertilizing. Yes, when I said replace, I did mean let it expire and get something new. But after looking at your average weather pattern, you have cool weather coming up in the next months, so it may perk up if you carry it through the hot weather.
In a large pot. The leaves curl then balls/masses appear. It started last autumn. I sprayed with insecticide then cut it down to 1cm then sprayed again and sprayed the compost around it. It flowered beautifully then about 6 weeks after first flowering this came back. It's now affecting other pots.
These are galls, and caused by insects. It will be necessary to treat often when you know that they are present in the area, as insecticides will wear off over time.
Here is an article that will help:
https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/controlling-fuchsia-gall-mites.htm
the leaves are all curled up in small clusters at the end of the stems
It appears to have gall mites, and a fungal infection! You will need to treat for the mites, first:
https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/controlling-fuchsia-gall-mites.htm
Next will be to treat the infection with a fungicide. This article will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
How often should a over-wintered fucshia be repotted. I have a couple of fucshia that have been in their pots for several years and am wondering what are the best options for keeping them growing.
I don't think there's a limited number of times they can be repotted, as long as it's done properly. Transplant only to a size larger than the current pot. My research says that transplanting in the fall is the best for your growing region.
https://www.gardeningknowhow.com/ornamental/flowers/fuchsia/fuchsia-transplanting.htm
I found a great article from the fuchsia society that may interest you:
http://www.americanfuchsiasociety.org/articledirectory/growing-fuchsias-in-pots/