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My Avocado Tree Has Brown Leaves

Evergreen avocado trees (Persea spp.) are a native of Mexico and grow up to 80 feet tall. The trees grow fast and have glossy, elliptical leaves and dark green, pebbled fruit with lemon-colored, creamy flesh. A fungal disease causes brown leaves on the tree.

  1. Identification

    • Avocado trees are susceptible to verticillium wilt, a fungal disease caused by Verticillium dahliae. The disease is caused by a soil-borne pathogen that enters and infects trees through the roots.

    Damage

    • The fungus infects the water- and nutrient-transporting tissues of the tree. Disease is characterized by browning and dying foliage. The dead foliage remains attached to tree for up to several months. The wood under the bark displays brown streaks. Infected trees can either recover or die entirely. There is no cure for verticillium wilt.

    Management

    • If the tree starts to recover and produces new growth, prune and remove all affected areas. Water and fertilize adequately to promote health. If the tree dies completely, remove entirely, including the roots. Avoid planting trees in areas with prior infection of verticillium. Use resistant varieties.

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Growing Mint
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