What Is Wrong With My Eucalyptus Tree?

Does the trunk or the branches sunken areas of dead tissue?

Does the tree lacks vigor and shows signs of drought stress regardless of the watering regime?

Does the trunk and the branches have holes, tree look weakened, twigs may be dropping?

Are the leaves curled and covered with honeydew?

Sunken areas of dead tissue on linden trees are caused by cankers. Cankers can be caused by several different kinds of fungi. Mildly affected plants will recover if you remove and destroy all affected branches. Heavily affected plants can't be cured and you should remove the whole plant. Avoid damaging your plant with lawnmowers, trimmers, or pruning tools because the wounds are the best place for cankers to start.

Phytophthora root rot is a fungal disease that occurs occasionally. These soil-borne pathogens can cause a tree to die within a few years if not treated. Treating phytophthora root rot disease is possible. You should use fungicides containing the ingredient fosetyl-al. Follow label directions.

Longhorned borers are known to attack eucalyptus plants, mining the inner bark and wood of branches and trunk. Prune off borer-infested branches. If you see borer holes in your trees, probe into them with a flexible wire or inject a solution of parasitic nematodes. After treatment, seal holes with putty.

Cause for leaf curling on eucalyptuses are psyllids, most notably red gum lerp psyllids. They can be recognized by the little white houses (lerps) that they secrete over themselves for protection. At the first sign of damage, spray your plant with insecticidal soap, or pyrethrin for serious infestations.

If your eucalyptus tree has drooping branches it may be infected with a heart or trunk rot. This fungus destroys the tree from the inside out and by the time it is discovered, the tree is already dying. Preventing the spread of disease should be a priority. Burn all damaged wood immediately and disinfect any equipment used.