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- The amount of water a dogwood tree receives is crucial to its health. Dehydrated leaves become brown and curled as the tree loses moisture, but frequently return to their healthy green once the tree is watered. Drought causes a dogwood tree to enter a dormant state. Watering the dogwood tree regularly prevents the leaves from becoming brown and damaged. Add water to the soil around the tree once a week.
- Serious nutrient deficiencies, as of iron or nitrogen, turn the leaves of a dogwood tree brown and prevent it from producing healthy, successful growth during that season. Fertilizing the dogwood tree annually with a balanced fertilizer adds the necessary nutrients to the soil around the tree. This helps avoid weak leaf production and keeps the leaves green instead of brown. Fertilize dogwood trees in the spring when they begin to produce leaves and flowers.
- Fungal diseases like root rot, anthracnose and leaf spot, turn dogwood leaves brown and weaken the tree's health. Untreated fungal problems may kill a dogwood tree after only a few years. Fungal problems infect a tree through poor soil conditions, standing water problems, injuries made on the tree through weather damage or severe pest problems. As the fungi mature, it kills the leaves, turning them brown.
- A severe infestation of pests like aphids, caterpillars or Japanese beetles can kill all of the leaves on a dogwood tree and cause premature defoliation. Insects feed on the leaves, leaving holes behind that lose the nutrients and sap a dogwood tree needs to be healthy. As more insects feed on the leaves, the leaves become weaker and eventually turn brown and die.
Water
Nutrient Deficiency
Disease
Pest Problems
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