What Causes Brown Spotting on Canary Palm Trees?
Nutritional Needs Palm trees need a lot of nutrients to grow successfully. According to the University of California’s Master Gardener Nancy Gravender, Canary palm trees need nitrogen, potassium and magnesium in large quantities. Since boron, iron, magnesium, nitrogen, potassium and zinc are also needed, conventional fertilizers are not enough. A manifestation of undernourishment in Canary palms is necrotic spotting of the leaves. This is particularly true of potassium deficiency. Frost According to Gravender, frost damage can also cause brown spots on the mature fronds (or leaves). The tree itself may survive, but parts of the leaves will suffer frostbite and can die off. New leaves will eventually grow in to fill in the gaps left by the dead leaves, but only if the tree has not been killed by frost. Fusarium Wilt Fusarium Wilt is a disease caused by the Fusarium oxysporum fungus. According to the University of California’s pest management program, this disease is lethal to Canary pal
