What Does a Palm Tree Need When the Fronds Look Burnt or Brown?

Leaf Spot Disease

• When the fronds look burnt or brown, they could be suffering from leaf spots caused by a number of different fungi. The spots are typically long, brown and oily in appearance. When leaf spots are the problem, the fronds should be kept as dry as possible, with no irrigation methods cascading down upon the foliage. The disease is typically aesthetic only, so fungicides normally are unnecessary. In severe cases, fungicides containing copper hydroxide can be used, but only if the fruit of the tree is not intended for consumption.

Ganoderma Rot

• Ganoderma Root & Butt Rot, brought about by the fungus Ganoderma zonatum, makes itself known as older fronds begin to turn brown, wither and droop. Newer leaves take on a pale green or yellow color with stunted growth. In many instances, they will fall parallel to the trunk, although they typically remain attached to the tree. The crown of the infected palm tree may collapse, with the entire trunk eventually crumbling, reports the Clemson Cooperative Extension.

Ganoderma Prevention/Solution

• Ganoderma rot is extremely serious and normally fatal to a palm tree, although specimens may survive for several years, depending on their overall age and health. No chemical cure exists for this disease. As the fungus remains in the soil for an extended time and usually infiltrates the root system, the best prevention is to ensure that new palms are not planted in areas previously infected by Ganoderma rot. Avoid injuries to the palm via mowers and trimmers.

Mineral Deficiencies

• A lack of mineral nutrition is a common deficiency in palm trees. Too little potassium causes the leaves of the tree to take on a withered, burnt and frayed appearance. Potassium disappears quickly from sandy soils--a likely environment for palms--with a lack of potassium eventually killing the tree. Palms demand fertilizers that contain a high level of potassium. Fertilize the tree separately from the rest of your lawn.