Manganese deficiency can be fatal to palm trees. This is a common problem in high pH soils (above pH 6.5) because manganese is insoluble at high pH levels. Additional causes can be high water tables or poor drainage, and excessive amounts of soil phosphorus, as it will tie up certain micronutrients, particularly manganese.
Early symptoms of manganese deficiency are yellowing between the veins accompanied by interveinal necrotic streaking on the newest leaves. If the deficiency is advanced, leaves emerge completely frizzled, withered, scorched and reduced in size.
Prevention and Treatment of Manganese Deficiency
Have a soil test performed to determine the soil pH and if necessary, adjust downward to increase the availability of manganese. Manganese sulfate applications to the soil or foliage can be used to avoid the problem. Apply 1 teaspoon manganese sulfate per gallon water to soil around the palm two or three times per year.