I have a pale pink 15 y.o. Brugmansia tree that blooms prolifically. However, within the past two years the old truck has become ulcerated and the branches drop leaves and shrivel up ... they end up looking like witches fingers. As newer branches are developing, they look healthy ... until they too become infected. I've asked many about this issue, including arborist, and no one has an explanation. I can't find anything about it on line. I do not overwater (probably underwater) and live in a Coastal area. There are no signs of insects on the leaves & branches. At this point I'm thinking of cutting off the front part of the tree (the older, diseased area) and trying to see if the rear, newer area of tree will survive. Please help! Thank you.
It could be a fungal wilt disease. I would suspect that the new growth can't get adequate nutrients and water when the trunk is ulcerated and damaged. I would try to propagate a new tree from any healthy wood and start over.
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/brugmansia-problems.htm
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/brugmansia-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/projects/rooting-plant-cuttings.htm
I bought these as tiny black seeds from China as Brugmansia (Angel's Trumpets) but they look nothing like the images on the internet, especially the leaves. I planted them in March and they have grown really quickly. Can you confirm that's what these are, please?
If you didn't buy the seeds from a reputable nursery, there is a good chance you got something other than brugmansia. Your photo didn't come through, so I can't ID the plant. Cultivars cannot be grown from seed, so unless you purchased species seeds, it may be a scam. Plus, the article below says the seeds are large.
https://depts.washington.edu/hortlib/resources/wp-resource_search.php?term=676
Something has been eating the bark off the trunk and limbs of my Brooke Mancia. There are tooth marks. Possibly rats? What can I do to save it?
It does seem like rat damages. Cages and baits can work, and that will be your best option. The only other thing that I would recommend is deterrents. They will be deterred by similar things as we would. Capsaicin, or pepper extract, is one thing that can keep them away temporarily.
https://www.gardeningknowhow.com/special/organic/do-hot-peppers-deter-pests.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/eliminate-rats-in-gardens.htm
I moved it into the sun for a day to see if it would enjoy that. Then I saw something weird on the leaves (see image). Is this a reaction to the sun? I've never seen this.
I think this is a compounded issue. I see what looks like the signs of spider mites. Those little speckles on the leaves are usually a good sign, as well as the wrinkling of leaves. The sudden sun exposure may have made this worse.
Treat the mites with something like neem oil or its extract, azadirachtin.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/azadirachtin-vs-neem-oil.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-control.htm
As far introducing to the sunlight- This should be done, gradually. Once you treat for mites, then you can start to introduce it back to the sun a few hours a day, increasing the time each day.
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/growing-brugmansias-in-containers.htm