I recently planted a grafted avocado tree, coastal sandy soil. I used compost and mulched with mushroom compost, in the ground about a month now. Looked healthy for a few weeks, but now the leaves are all turning brown. The tree is at Bribie Island. Your help would be greatly appreciated. Dools.
Transplant shock can cause browning and dropping leaves in the first few months after planting. See this article:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
Here are some general causes of browning leaf edges and tips:
https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm
Strong sun and winds could also damage leaves. Young avocado trees are sensitive to strong sunlight, so providing it with some shade could help. Here is some more advice about avocados:
http://ceventura.ucanr.edu/Gardening/Garden_Info/avocado_questions/
I am growing an avocado tree in my home as an experiment with my son. We have stiff white leaves growing off the top. They don't seem to be harming the plant but it isn't growing very fast.
It appears your Avocado plant is forming a flower cluster.
https://www.gardeningknowhow.com/edible/fruits/avocado/indoor-avocado-plant-care.htm
I have an avocado tree I inherited from a former coworker and knowing nothing about indoor avocado trees, I did some reading. From your article, I'm thinking this might be one of the tree suckers you mentioned, but I don't want to start clipping things off and inadvertently killing this plant. I've attached some photos. Thanks! (I know it's not in the best spot right now, but it's only been there since this morning. The tree is going home with me tonight to a window with lots of sunlight.)
This could be a tree sucker or simply a tree that's developing two trunks, but it could also be a grafted tree. If possible, it would be good to get some clarification from your former co-worker on whether this is grafted.
The two stems look about equal in size, and I'm not sure which of the two stems (or both) would be the grafted one, so I think it's best to leave both of them on.
I have been rooting an avocado in water and there is a significant root system now. However, there are growths on the roots. Are these nodules supposed to be there?
These little nodules are called adventitious roots and are normal. They are an indication of the roots looking for air. It is best to get your Avocado planted soon.
Here is a link with care information.
https://www.gardeningknowhow.com/edible/fruits/avocado/indoor-avocado-plant-care.htm
I have been rooting an avocado in water and there is a significant root system now. However, there are growths on the roots. Are these nodules supposed to be there
Plant has pale to yellow leaves, alligator bark, whole in trunk with fine dirt like debris. Tried to fertilize but not very successful. What can be done to correct problem or help to revive to better yield in fruit? This is a private resident and tree is old (35 yr.).
With visible signs of Borer damage that you mention I would suggest you have a professional Arborist examine the tree.
Here is a few articles for you with more information.
http://www.ipm.ucdavis.edu/PMG/r8300411.html
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-pests-and-diseases.htm
We have an avocado plant that we started from a pit or seed. It is a bit over two years old and is now about seven feet tall. It is an indoor plant and is now inches from the ceiling but appears to have stopped growing up, though the branches in front of the window are still growing. We would like to prune the plant back considerably, but we don't want to damage or kill it. Can you give us some advice on what to do/not do? Thanks, Jerry.
To encourage more side branches, try cutting back the main stem of the plant by about 1/3. This will hopefully encourage the plant to produce more bushy, full growth. It may send up another tall stem toward the ceiling, but you can cut that one off too. As long as you don't remove more than about 1/3 of the tree's size at any one time, it will be fine. Also see this advice:
https://www.gardeningknowhow.com/edible/fruits/avocado/pruning-avocado-trees.htm
There are spots on some of the branches. What is that? Regeres Lis
Here are some links to help you with identification.
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-pests-and-diseases.htm
http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0006/120012/avocado-diseases.pdf