This disease is caused by the fungus, Ganoderma zonatu , which can infect many types of palm trees. The first symptom of infection is the withering and drooping of older fronds. Fronds collapse and droop parallel to the trunk. New growth is stunted and is pale green or yellow in color. The head of the infected palm tree may fall off or the trunk collapse. Depending on the point of invasion, palm tree roots may be severely decayed.
Outer trunk tissues may seem solid, but affected palms have a hollow sound when tapped. Areas of dark brown tissue are evident when the trunk is dissected. Over time, conks (spore producing structures of this fungus) may form. Palm tree death can take three to four years, depending on the age of the tree and environmental conditions.
Palm Trees Treatment
This fungus survives on plant tissue, so remove and destroy any root systems, stumps and trunks of dead palms in the landscape. Avoid any injury to the palm tree, especially during planting, staking and regular maintenance activities by string trimmers and lawn mowers. Ganoderma survives in the soil, so it is not recommended that another palm tree be planted in the same location. Unfortunately, there is no chemical control for this disease.
I looked at a lot of different books about Palm Tree Insects before I found “Insects on Palms”. I think that, authors have done a superlative job condensing years of research into a comprehensive encyclopedia of insect pests of palms. It is a very useful book, and it was a great addition to my Palm Tree book library.