Triangle Palm Tree [NEED HELP please..]

[AntonPerth]

Hi All

My name is Anton and I live in Perth, Western Australia. 

Perth has a Mediterranean climate with hot, dry summers and mild, wet winters. It is the sunniest capital city in Australia with clear blue skies an incredible 70% of the year!

I've got these 2 Triangle Palm Trees in my backyard. I recently moved into this place 6 months ago and I never took care of a garden before because I had been living in apartment (no garden).

 

I noticed these 2 Triangle Palm Trees in my backyard that looks unhealthy:

1) Shedding barks on the base of the trunk (exposing the root). Photo attached

2) Some weird black marks (possibly wound or disease) on some part of the trunk

3) The leaf is brownish and has black spots on some of them

 

Can someone please help me and if possible provide a detailed guidance on what should I do?

I've contacted a lot of arborists in my area. Only few of them are willing to come and have a look (they're all too busy!). And they all give different (and conflicting) advices.

Some said water more. Some said don't water directly to the tree causing the rotten trunk.

Some said put fertilizer. Other said don't put fertilizer because it looks like it is poisoned from over-fertilizing.

I'm really confused (especially as a beginner in gardening).

 

If can someone point me in the right direction, that'd be much appreciated 🙏

This is what I've done so far:

1. Cut off some brownish fronds

2. Pour fungacide on the crown

3. Get sprinkler pointing away from the trees

 

Is there anything else I should be doing? Thanks again for your help

Please let me know if you want to see more photos.

Best regards,

Anton

[AntonPerth]

And I desperately rely on these palm trees as a screen against the tall building in my backyard....

[RichardHemsley]

For certain,  dont water in to the crown shaft. I managed to kill one through over watering from overhead. 

[96720]

The damage to the bottom of the trunk shouldn’t be a problem it’s just ugly and nothing you can do about it!! It looks like you pulled the brown fronds off instead of cutting them off that white area on the trunk is not good as it can let disease in you should cut them off and leave the base on!! Other than that it looks pretty good!

[Merlyn]

Step one is to adjust the sprinklers.  You want them to water the ground near the palms, but never hit the palm directly.  The trunk sections will probably dry out and be okay, but not if they keep getting drenched.  Some sulfur powder might help kill off any opportunistic fungus. 

Step two is treat the crown on this palm:

The purple, brown, and black marks look like a crown fungal infection.  It seems like the new spear is leaning off to the right, which might be okay and just a sign of some crown rot.  Good solutions for that are a crown drench of household 3% hydrogen peroxide, Daconil, Mancozeb, Aliette/Fosetyl-Al/aluminum tris.  I generally use hydrogen peroxide and Daconil, but I know Daconil is banned in some places.  If you pour hydrogen peroxide in there at 3% strength then check for bubbling.  If it bubbles up there's a fungus present.  No bubbles = no fungus!

Step three is fertilize with a "palm special" type of mix.  I doubt they are being "poisoned by fertilizer," unless someone was spreading fast release 10-10-10 mix on them.  In the US we recommend 8-2-12 PalmGain, or something with a similar mix.  You probably have different brands there, but if you look at the label and mimic the 8-2-12 ratio and the micronutrients (iron, magnesium, manganese, boron, etc) then it'll probably work great.