A: “Yellow leaves” on azaleas is a common problem. The disease lives in the soil, so don’t replace the plants you remove with more azaleas. Too much sun dries out the soil and can burn the tender leaves of the azalea. How can I treat this problem? We list some of the common diseases and problems of Azaleas and provide some ideas about prevention. RELATED: Cumquats, Lemons, Mandarins and Oranges Causes of yellow leaves on citrus trees. The summer leaves remain on the plant towards the top of the branches and is set closely together. Tweet. This is quite normal and should not cause concern. Now, they're both almost completely yellow… What's wrong with my azaleas? One of the most common problems with azaleas is the ‘black spots’ that appear on the foliage. Infected leaves may fall. Citrus trees are versatile and do well in most climates, but there are lots of things that can give your lemon tree problems! I have several oleanders in my yard, and I am having trouble with the leaves turning yellow. Leaves roll and droop; no insects evident: Water stress Canker Root problems: II. Leaves turning yellow or brown in the margins between the veins which may remain green, while young leaves may appear to be bleached ... An effective combination of two fungicides to prevent and control diseases on azaleas, roses and lawns. Cercospora handelii: Inspect new plants and do not use if found to be infected. A while back, I noticed that two bushes adjacent to each other had some yellow leaves, but I didn't think much of it. These leaves fall in autumn, often turning orange, crimson or yellow. Like all evergreen plants, rhododendrons and azaleas periodically lose some of their foliage, and the leaves may turn yellow, red, or purple before they fall. Dark-brown, pimple-like fungal fruiting structures form within the spots. Branches and Twigs Affected: A. Terminal buds and leaves turn brown: 1. Leaves thickened or fleshy, turn pale green or whitish: Leaf and flower gall (Exobasidium) 2. Yellowing of oleander leaves is a common symptom that the plants are too dry. And yes there are different types of, Azalea Indica hybrids, Kurume hybrids, Mollis hybrids (deciduous) Lace Bug – Black Spots on Azalea Leaves. Some nutrient disorders can look alike so growers can contact their county extension agents either before they plant to test a soil sample or, if they notice … Leaves eaten or chewed at margins in half-circle pattern: Black vine weevil: D. Leaves distorted: 1. If lower leaves turn yellow between the veins (that is the veins stay green), they may need more magnesium. Severe cases may lead to premature leaf drop or stunted growth. Leaf rust causes small, circular yellow marks on the upper side of the azaleas leaves. Often the only leaves that remain are those that surround the flower buds at the tips of the branches. Circular to irregular brown spots up to 1/2 inch in diameter form on leaves, especially lower leaves. More. February 23, 2016 Advertisement. Symptoms include leaves that go from pale green to yellow to brown, prematurely falling leaves, and dieback. pruning azaleas The new spring growth on Azaleas can be pruned to maintain the attractive shape of the plants. Q: The leaves on my azalea are turning yellow. The undersides of leaves produce orange or rust colored pustules flecked with yellow. I am using a powdered, water soluble fertilizer product that says it acidifies the soil and adds iron to the soil. The spores from the pustules spread easily to other leaves on the shrub, especially in damp or wet conditions. Save Pin FB. Email. Send Text Message Print Comment. ... Yellow mottling or bronzing of the leaves similar to lace bug damage. Soil that drains too slowly, or is naturally boggy will cause the azalea … Spots may become tan in the center and may have a yellow halo. 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