Branches and Twigs Affected: A. Terminal buds and leaves turn brown: 1. I am using a powdered, water soluble fertilizer product that says it acidifies the soil and adds iron to the soil. The yellow leaves on your azalea are concentrated in one part of the plant while the rest of the shrub looks green and healthy. Many who have ever grown Azaleas will know that they like an acid pH. If you have been experiencing very dry weather, this has encouraged the azalea to shed its oldest leaves. How much should I use to increase the soil’s acidity? If your plant is dry – you can stick your finger into the soil to check it – try to get it on a regular watering schedule. Now, they're both almost completely yellow… A: “Yellow leaves” on azaleas is a common problem. Azalea lacebug Upper surface of leaves has a gray, blanched, or coarse-stippled appearance. A while back, I noticed that two bushes adjacent to each other had some yellow leaves, but I didn't think much of it. Azalea leaves and flowers tend to wilt for three reasons: Azaleas have shallow roots which leaves them vulnerable to drought which results in wilted leaves and flowers. Too much sun dries out the soil and can burn the tender leaves of the azalea. Other signs that your plant is not getting enough water are leaves that are curling inward, drooping down, … Chlorosis There could be several reasons for those azaleas turning yellow. Most garden plants will require a pH of 6.5 - 7 for strong healthy growth which is just on the acid side of neutral I planted azaleas two springs ago. Would a soil pH problem cause this? Repeat application every 10 days until control is obtained. The undersides of the leaves become discolored by excrement and cast skins. Why? Q. Azalea Spotting - I planted 5 gallon-sized azaleas last spring. Leaves. Q. Azalea With Yellow Leaves - My azalea has been extremely healthy all summer but now has lots of leaves turning yellow and falling off. Q: The leaves on my azalea are turning yellow. pH is the measured alkalinity or acidity of a soil. Affected leaves may also curl up and drop. Soil that drains too slowly, or is naturally boggy will cause the azalea to have root rot. There could be several reasons for those azaleas turning yellow. Leaves eaten or chewed at margins in half-circle pattern: Black vine weevil: D. Leaves distorted: 1. Leaves thickened or fleshy, turn pale green or whitish: Leaf and flower gall (Exobasidium) 2. Q. Azaleas With Yellow Leaves - I planted 13 azaleas in my front yard about 5 months ago and now the leaves are turning yellow. This symptom tells me that the root system is impaired or there is a marked pH difference on that side of the plant. Stunt Nematode – These azalea pests attack the feeder roots and cause azalea plants to become stunted and yellow. HELP!! Azaleas are a joy to see in any garden, but have you ever encountered the frustrating problem of the leaves turning pale green to yellow. Spray undersides of the leaves with Malathion, dimethoate (Cygon), or acephate (Orthene). Azalea Leafminers – This azalea plant pest generally “mines” between the upper and lower surfaces of leaves causing brown blisters or yellowing on the leaves. The first year the leaves were dark green, but last year they started to turn yellow shortly after flowering. What's wrong with my azaleas? Right before the leaves fall off the plant, they will turn yellow. Azalea leaves naturally turn these colors before they fall. Leaves roll and droop; no insects evident: Water stress Canker Root problems: II. This process duplicates the coloration normally seen later in the year. Removal of affected plants may be necessary.