As disease progresses, the spots turn brown and enlarge in size, covering the entire foliage surface. After it has been potted up, regular, deep watering will be necessary. The disease can become a problem if there is cool, moist weather when fruit and leaf tissue is young. So, as soon as the soil seems dry to the touch, it is time to water again. It's in a large pot, outside on our east-facing patio. Otherwise, if it’s functional, it’s useful. Keep the growing area clear of fallen foliage to keep fungal spores from spreading. Hold the avocado in your hand and apply gentle pressure. Remove unhealthy trees; it is safest to fumigate the soil if replanting to avocado. Prevention/Control The University of Florida IFAS Extension recommends using fungicidal sprays … A healthy avocado tree has glossy, dark green leaves, intact bark and plenty of blossoms. Keep your tree watered and make sure to have a protective layer of mulch to help keep the tree well hydrated. ( Log Out /  And in the spring and summer, the air indoors in most climates is much, much more humid than in the winter: certainly at least in the 50% range. Leaves have brown spots and become crinkled. It would really prefer full tropical sun and intense atmospheric humidity, things that are hard to give it indoors. The avocado comes from a humid tropical climate where the atmospheric humidity is usually at least in the 70 to 80% range and often well above that. The root ball must never dry completely, because that too can lead to leaf browning. Plan the perfect garden with our interactive tool →, University of Florida Extension: Avocado Growing in the Florida Home Landscape, University of California Extension: Avocado. Leaves may turn brown but hang on the branches for months. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. I've been growing this avocado from a seed, and it's leaves have recently been turning brown. A fungal disease leads to brown spots on tree foliage. The plant is 30 inches (75 cm) tall and has only one main stem. To keep the leaves in top shape, you need to try increasing the humidity as much as possible and the easiest way of doing so is with a humidifier. For “perfect” growth (i.e. True enough, it’s relatively easy to grow one from a pit harvested from a store-bought fruit and that’s kind of fun. If so, do I cut a portion of the leaf and leave the green portion in hopes of maintaining photosynthesis or should I cut at the base of the leaf? Bleached, sunburned avocado leaves These leaves have actually been burned. Chemical control options include the use of copper hydroxide sold under various trade names. And when the air is too dry, evapotranspiration (loss of water from leaf cells) increases. If you have noticed the leaves of your avocado tree browning and are concerned about the health of your plants and the state of your tree, there are several causes and solutions to keep your avocado trees healthy and free of brown spots. Of course, this is far from the 70 to 80% the plant really wants, but at least it ought to keep all but the oldest leaves from browning at the edges. Ideally, the water would have a calcium carbonate concentration of less than 60 mg/l: i.e., it should be soft. The humidity it gives off often diffuses into the air around before reaching the lofty leaves of indoor trees like the avocado. through tiny cracks in the bark. Learn which plants thrive in your Hardiness Zone with our new interactive map! Even though the existing spots will remain after treatment, you can prevent new spots from forming by thinning the tree and spraying it with a copper fungicide. The white spots could be fungal as well. 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