Depending on the species, azaleas grow in U.S. Department of Agriculture plant hardiness zones 4 through 9. Q: My azaleas are looking more brown than green. Spray plants with a horticultural or insecticidal soap, making sure to completely soak the undersides of the leaves at the first sign of the insects. Regular water, with a deep soaking once a week during the growing season and more if the weather turns very hot. A more complete list of azalea problems is at ... and collapse and appear water soaked in a few days. but one of the end ones isn't doing too great. Help fund crucial watchdog journalism. If the plants aren't looking healthy even during the growing season (and you've eliminated lace bugs as the suspect), then run a soil test to see if any nutrients are lacking or if the acidity level isn't right. I'm not sure if this harmed it or if it is acting normally. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local. My Rhododendron Is Losing Leaves and Is Crispy, How to Keep Hydrangea Leaves From Burning in Full Sun, Problems with Azalea Leaves Turning Pale with Brown Spots Underneath the Leaves, Clemson Cooperative Extension: Azalea & Rhododendron Insect Pests. As a rule, give your azaleas the following conditions, or replant them in a different location to keep them healthy: Although damage from lace bugs causes leaves to turn more speckled gray or white than brown, the damage from the bugs may ultimately cause a dieback disease that turns the leaves brown and kills entire branches. Follow these guidelines to control the bugs: Protect yourself when using strong pesticides by wearing goggles, long sleeves and gloves, and only spray the products on a calm, dry day with no wind. It's called "windburn.". Sterilize your pruning shears with rubbing alcohol or a mix of 1 part household bleach to 9 parts water between each cut to avoid spreading the fungus within the diseased plant or between plants. Plants usually push out new growth in spring to bounce back from that damage, although you may need to start spraying (insecticidal soap) to control this common azalea pest. Good coverage is essential. They're "evergreen" shrubs, but that doesn't mean the leaves can't turn bronze or even mostly brown and still be healthy. Watch for new browning in May as a possible sign that you're dealing with lace bugs. Hi--I planted 4 White Gish Azaleas late last fall. Your azaleas are especially subject to dieback if you haven't watered enough, especially during a heat spell, or if the plant experiences a heavy frost. The plant is likely to recover on its own. Bayleton may be used when the buds show color. © 2020 Advance Local Media LLC. I had sprayed the entire area and the bush with Miracle Grow plant/flower food. If you cut off this wood over winter or in early spring, you'll cut off the buds that would've opened into those gorgeous flowers. Lundman belongs to numerous gardening groups, tends her home garden on 2/3 acre and volunteers with professional horticulturists at a 180 acre public garden where she lives on Bainbridge Island in Washington State. half of it basically looks dead and the other half isn't spectacular but it looks a good bit better than the other half. Subscribe to PennLive. Here is a link that might be useful: A: It's not unusual for azaleas to turn at least somewhat brown over winter. For example, swamp azalea (R. viscosum) likes constantly wet soil, while Oconee azalea (R. flammeum) can take more heat than many other varieties. This kind of browning leaves is called "windburn" and is due to cold, drying winter weather. The dieback fungus causes leaves and branches to turn brown and die completely even though other branches may appear healthy. © Copyright 2020 Hearst Communications, Inc. they are kinda small. Azaleas (Rhododendron spp.) As for fertilizer, if your plant is growing well and blooming well, you probably don't need any supplemental fertilizer. Problems with Azalea Leaves Turning Pale with Brown Spots Underneath the Leaves Azaleas (Rhododendron spp.) Dead flowers turn brown and cling to the plants instead of falling to the ground. I have an azalea that has turned brown while we were out of town for a few days. ... Continue at 7- to 10-day intervals during bloom period. Bad infections for several years can cause enough damage to kill azaleas. Please advise. Community Rules apply to all content you upload or otherwise submit to this site. You may need to reapply every 10 days during early spring. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). Spray a fungicide that contains thiophanate-methyl or mancozeb, and apply the product as directed on the label, making sure to completely soak each leaf and branch. Azaleas grown in direct sun are more prone to lace bug infestations. For heavy infestations, spray on an insecticide such as acephate, lambda or cyhalothrin, applying the product as directed on the label and soaking the leaves completely. If the azalea flower itself is the only part of the plant that appears to be suffering and turning brown, the azalea has Ovulinia azaleae, or petal blight. If your azalea becomes infected: Because pesticides also kill beneficial insects such as bees, use these toxic products to correct problems only as a last resort after trying environmental or less deadly options. Wait until warm weather returns to see if you don't notice fresh new green growth. Resistant varieties include ‘Delaware Valley White’ (Rhododendron ‘Delaware Valley White’), ‘Hershey Red’ (Rhododendron ‘Hershey Red’) and ‘Pink Gumpo’ (Rhododendron ‘Pink Gumpo’). Plant bug-resistant varieties of azaleas, such as 'Dawn' (Rhododendron 'Dawn'), 'Pink Star' (Rhododendron 'Pink Star') or 'Ereka' (Rhododendron 'Ereka'). Cold, winter winds can dry the foliage and cause the loss of green color. It's at least 4 years old (when we moved in here). Wait until right after the plant finishes blooming in spring. All rights reserved (About Us).

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