I have azalea plants in which the leaves have become brown and black and sort of bubbled up and curled. I believe they are putting out a black mold that is turning our brick work and wood work (fence) black, and rotting the wood as well. The black is also on the concrete patio ground. Are you familiar with any of this? If so, any suggestions?
It sounds like the tree has sooty mold, which is actually an indicator of a pest infestation. Many times the pests that cause sooty mold are too small to see, but they can be damaging. I would recommend treating the plants with neem oil. This will treat both the pests and the sooty mold. Here is more information that may help:
Last year my four azaleas got what I think is rust. I treated them with a fungicide, but I didn't know they had the problem until they were almost completely covered. Can azaleas be pruned down to the ground before the season begins this year and save them? Will I just need to dig them up and start over? If so, how do I need to treat the soil before planting anything again?
I would recommend treating them with fungicide frequently at the beginning of the year, including the soil around the plants. Also, prune some of the interior branches out so that the plant has better air circulation. It has been a rather cold winter, so you have a good chance that the rust fungus has been killed back somewhat to a manageable level.
I have noted a light bluish-green, algae-type deposit on the branches of my very mature azaleas in southern New Jersey. I planted these over 30 years ago and do not want to lose these specimens.
It actually sounds like they have developed a lichen, which is not harmful to the plants. This article will explain more about them:
Leaves changing to purple and drying out, then branch dying. They have plenty of water.
Unfortunately, it may be Phytophthora root rot. This article will have more information that can help you confirm it: https://www.gardeningknowhow.com/ornamental/shrubs/azalea/phytophthora-root-rot-azaleas.htm
We have a four-year-old azalea planted on the east side of our house. The plant is stunted with few blooms each spring. What seems to be the problem?
It sounds like it has a nutritional imbalance of some kind. There are several nutrient deficencies that can cause this, but the most likely is phosphorus. Add a phosphorus rich fertilizer and have the soil tested for other deficiencies.
What can I use to treat mossy fungus on azaleas and spots under the leaves of camellias?
The fungus you see on the azalea is probably lichen. It is not harmful to the plant but if you want to be rid of it, this article will help:
As for the spots on the camellias...Can you describe them a bit more, in terms of color and shape? There are several things it could be and I want to make sure we give you the right advice.
Since the snow went off this year, I have a green mold growing on my plants. This never happened before. What can or should I do?
The fungus you see on the azalea is lichen. It is not harmful to the plant but if you want to be rid of it, this article will help: