I find that whenever a plant is suffering it is also a poor soil health problem. If they have been growing there for quite some time, they will benefit by an application of good soil like compost etc. and some nutrients, and check for the pH needs of the plant you are working with to see if it needs an application of lime or something like that. The tree will benefit greatly by getting stronger and more able to fight the pests that invade it.
I find that whenever a plant is suffering it is also a poor soil health problem. If they have been growing there for quite some time, they will benefit by an application of good soil like compost etc. and some nutrients, and check for the pH needs of the plant you are working with to see if it needs an application of lime or something like that. The tree will benefit greatly by getting stronger and more able to fight the pests that invade it.