The state is full of California palms due to their iconic appearance and low maintenance level, as well as their perfectly adapted state to the local climate. Unfortunately, there is also an array of diseases which have taken to infest our local California palm tree population, most significantly the Pink Rot, Diamond Sale, and the Fusarium Wilt. By informing yourself about these diseases, you will be able to spot the warning signs and know what to expect for the future of your tree.

Pink Rot

The majority of Californian palm trees is susceptible to catching pink rot which is transmitted by a fungus with the catchy name of Nalanthamalavermoeseni. Fortunately, pink rot is often only a serious issue for already weakened trees.You can spot pink rot by keeping an eye on rotting and deformed leaves, and signs of rot along the trunk. However, most commonly, the rot will be limited to the upper portion of the tree’s leaves. There is a chance of recovery for infected trees, but some do find their demise as a result.Preventative measures include general tree care, i.e. not damaging the roots, watering them during droughts, and pruning them according to their species’ recommended frequency.

Diamond Scale

A fungus by the name of Phaeochoropsisneowashingtoniae is responsible for infecting trees with diamond scale. While this disease rarely leads to a tree’s death, it is also far from pretty to look at, and it can make your tree susceptible to other infections which could lead to its demise.You can spot this disease by taking note of darkened spotting on your tree’s leaves which then transform into mushroom looking growths the shape of diamonds. Over time, the infected leaves will start to brown until they eventually die completely.

Fusarium Wilt

Brought on by the Fusarium oxysporum fungus, fusarium wilt in California generally refers to canariensis, which is a form of the fungus that specifically attacks the Canary Island palms, and causes their leaves to brown and then wilt, and the tree to weaken. As a result, the palms will become highly susceptible to other diseases which oftentimes cause them to die before the fusarium wilt can get the job done itself.

How An Arborist Can Help You

Whether you are looking for answers in regards to your tree’s health, or which tree is best befitting to your specific needs, your best chance at obtaining the information you require is to call a certified arborist in Bay Area. They understand all aspects of the issues that your trees are facing and will evaluate the situation and give comprehensive treatment. This will not only keep the trees healthy but adds to the curb appeal of your home.


We hired Arborworks to remove 10 trees at our new house. There was a small overgrown forest going on. I don’t think anyone ever trimmed anything in this yard! Not only did they remove the trees and ground the stumps, they also took out our other items we had cut down ourselves.The biggest tree was almost three stories, you could see it towering over the house from the front and we have a two story house. Could not believe how efficiently they cut down that monster tree. Their guy who was in the tree – WOW he made it look easy but I know that it wasn’t! Knew what limbs to cut and where the limbs were going to fall. Was very impressed! We were there when they took all the trees out and I can tell you they definitely know what they are doing. They asked if we wanted the chips/mulch from the stump grinder otherwise they would have taken it away.I would hire them again in a heart beat and I’ve already recommended them! Great prices and GREAT service.
George R. Palo Alto, CAPalo Alto, CA


Arborworks Inc. Diamond Certified