Is it normal for the Mesquite tree to have really dark places on the bark and drip sap?
It sounds like the tree has slime flux. The jury is out on this disease in terms of how lethal it is. Some people feel that Mesquite can recover from it fine after being infected while others feel that it is potentially dangerous to the long term health of the tree.
There is no known "cure" for slime flux. It is something the tree has to battle itself. But, proper water and nutrients will go a long way to helping it recover.
What is the best way to remove my bleeding mesquite tree's black tree sap from painted mason wall?
A few methods have been reported to work, including a scrub pad with with Goo Gone cleaner.
Petroleum based cleaners seem to be the best on sap.
The branches have the bark cut through encircling the limb so that the limb dies.
There are several things you can do about controlling insects. There are many natural remedies, and synthetic. I like neem oil, rosemary oil, and cinnamon extract for this purpose.
Here is a link that will help: https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm
Mesquite lower small tree limb leaves have turned brown as if lack of water. Tree has good water. Hard sap noduals a appear on these limbs only.
This seems to be common, and somewhat normal unless it spreads upward. Then I would look to a fungal infection. Otherwise, sometimes the plant sheds its lower growth naturally.
Alternatively, if you are feeding the plant, it could be fertilizer burn. These are actually legumes, and produce their own nitrogen. They don't, usually, need extra feeding.
Here is an article for more information on the tree:https://www.gardeningknowhow.com/ornamental/trees/mesquite/growing-mesquite-trees.htm
Can I put gauze on my tree? It won't stop sapping after a year and its staining everything.
You can, but if there is something causing damage to the tree, such as a woodpecker or other pest, then it may not solve your problem. This is a tricky situation. You may have to just try and get the sap off of everything often and as best as you can. This article will help: https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-remove-tree-sap.htm
It is not a pest, it just never healed after it was trimmed.
Dear mr. or mrs. What is your advice on planting Mesquite trees in Spain? My goal is to create a food forest with several plants that don't need much water. However, I've found several articles that Mesquite can be very invasive. Since Mesquite isn't native in Spain I do not want to introduce a species that is invasive. Regards, Sander
Although I would not recommend growing this in ground, it would never hurt to have one in container to keep it from spreading. This article will give you more information: https://www.gardeningknowhow.com/ornamental/trees/mesquite/potted-mesquite-trees.htm
A landscaping company I hired to clean up the yard and trim back trees trimmed one of the mesquites so harsh, he removed all the limbs with leaves ( I no longer use this landscaper!). Should I continue to hope it will sprout new leaves? It was cut back in September and this is December 1st. I cut into the body of the tree and there is still green so it appears to still be alive. Any advice?
If you still see green then the tree will likely recover. It will just take some time. This article will give you more information on the tree: https://www.gardeningknowhow.com/ornamental/trees/mesquite/growing-mesquite-trees.htm