Help! What is wrong with my citrus trees?

[RoystoneaJax]

Something has really done a number on all the citrus in my yard and really even in my whole neighborhood. I used to have really healthy orange, lemon, and grapefruit trees in my yard that made tons of fruit every year but starting probably around 10 years ago they all got sick and declined. I have already removed the grapefruit and lemon tree and I think I am going to remove the orange tree this spring. I have attached pictures of my orange tree and a small potted grapefruit which came from a seed from my old grapefruit tree. What is going on with them? If I get new ones from the store is there something I can do to prevent this from happening to them?

 

 

[Xenon]

Sure looks like the dreaded HLB/citrus greening that is destroying the Florida citrus industry. There's no cure, best to chop and burn. 

'Sugar Belle' mandarin and some others like 'Temple' tangor and 'Parson Brown' orange are supposedly tolerant (not immune) to HLB but will require more fertilizer input to keep them in decent health and production. 

[thyerr01]

I agree, the asymmetric mottling (eg first pic, top left) isn't a great sign. Not many options for protection either if its citrus greening. Its insect borne and likely that native citrus relatives like Zanthoxylum can facilitate the spread (of the insect, unclear about the bacteria). Australian finger limes are meant to be quite resistant/tolerant and possibly other Australian citrus (eg. desert limes) which I have occasionally seen plants or seeds for sale in the US.  I've also read, but have no idea if its true, that faster growing citrus like certain lemons can generate enough new growth to kinda keep ahead of it.

[GeneAZ]

Just an observation in my own yard in Arizona.  I have two citrus trees that are one acre apart.  The one with the greening disease is a cocktail tree with grapefruit, lemon and orange, and it's slowly checking out.

The second tree is Tangelo and I always put each and every fruit in an organza bag with drawstring each spring as they get to 2-inch size fruits, so that no insects or woodpeckers do damage.

So there's been no sign of the disease spreading to my Tangelo tree after 4 years of this practice.

[Silas_Sancona]

28 minutes ago, GeneAZ said:

Just an observation in my own yard in Arizona.  I have two citrus trees that are one acre apart.  The one with the greening disease is a cocktail tree with grapefruit, lemon and orange, and it's slowly checking out.

The second tree is Tangelo and I always put each and every fruit in an organza bag with drawstring each spring as they get to 2-inch size fruits, so that no insects or woodpeckers do damage.

So there's been no sign of the disease spreading to my Tangelo tree after 4 years of this practice.

While ACP, Asian Citrus Psyllid occurs here,  HLB / Citrus Greening has not been detected in AZ  -yet-

https://citrusindustry.net/2020/04/28/how-arizona-has-avoided-hlb/

[rprimbs]

You could try spaying it with Keyplex foliar feed for citrus.  The  Huanglongbing disease goofs up the flow of nutrients from the roots to the leaves so a good foliar feed with micronutrients corrects the problem.