No matter what the cause of the yellowing, you will need an arborist if it is not a natural occurrence. A professional can provide medication to address the issue.
Pests may infest your palm tree and cause the discoloration. Some of the common ones in Southwest Florida are whiteflies , mole crickets, aphids, mealybugs, and spider mites. Not all yellowing palms are hopeless. With the help of a professional tree company, you may be able to save the life of your trees. You will need experts for proper diagnosis and treatment. All are critical to the health of palm trees. Palms must be fertilized to remain healthy. Palms can suffer from a number of conditions based on the nutrients deficient in the soil.
The most common nutrient deficiency is potassium, the first signs of which will be some sort of yellowing of older leaves. When fertilizing your palm trees, potassium supplements should accompany the application of Milorganite. Iron is one nutrient palm trees need to remain green.
Milorganite contains more than 2 percent of non-staining iron, making it a good base for your fertilization program. Check with your local university extension to learn more about the common nutrient deficiencies in your area and to have your soil tested to identify specific nutrients deficient in your soil. Turfgrass fertilizers are typically high in nitrogen N and low in potassium K.
This forces the palm to push new growth, and since there are not enough nutrients in the soil, the palm will steal the nutrients from its own older leaves. The result is a self-induced nutrient deficiency in the older leaves which will look ratty. This brings us to rule two. The second rule of palm fertilization is not about fertilizer at all. It is about pruning! If it is not dead, do not prune it off. OK, so you know a dead leaf right? A dead leaf is completely dead and brown.
What about those bronzy, orangey, speckled, and highlighter yellow leaves on the bottoms of palm tree crowns that are definitely not dead, but look like total trash?
When you can see light through the bronzy speckles on the lowest palm fronds, you are looking at a characteristic potassium deficiency. Those leaves are alive and they are critically important to the palm tree that looks like trash… they are the cure!
Those leaves are keeping the palm tree alive because the new growth of the palm needs potassium and magnesium, but cannot get it from the soil, so it steals those nutrients from its own older leaves to relocate those nutrients in the new growth.
In general, pruning green leaves off palms is like removing solar panels and nutrient reservoirs, while at the same time inviting palm diseases to dinner with an open door through the open wound where the green leaf was pruned. Palms need specific nutrients to grow healthy and strong but these may not be naturally present in their soil. A surefire way to tell if your palms are asking for fertilization is to look at the fronds:.
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